All Roofing Calculators
187 free calculators for every roofing project. From shingle quantities to full cost estimates, find the exact tool you need.
Shingle & Material
Calculate shingles, bundles, underlayment, and material quantities for any roofing project.
22 calculators
Shingle Calculator
Free shingle calculator to estimate how many bundles of shingles you need. Enter your roof dimensions and pitch to get an accurate material estimate with cost breakdown.
Open calculatorAsphalt Shingle Calculator
Free asphalt shingle calculator. Enter your roof dimensions to estimate bundles, squares, and total material cost for 3-tab, architectural, or luxury asphalt shingles.
Open calculatorUnderlayment Calculator
Free roofing underlayment calculator. Enter your roof area and select underlayment type (felt, synthetic, or ice & water shield) to get an accurate roll count with cost estimate for 2026.
Open calculatorRoofing Material Calculator
Free roofing material calculator. Enter your roof dimensions to get a full BOM including shingles, underlayment, drip edge, ridge caps, starter strip, flashing, nails, and vents with 2026 pricing.
Open calculatorRidge Cap Calculator
Free ridge cap shingle calculator. Enter your ridge and hip lengths to calculate how many bundles of ridge cap shingles you need, with cost estimates for 2026.
Open calculatorIce & Water Shield Calculator
Free ice and water shield calculator. Enter your eave length and climate zone to get the exact number of rolls needed for code compliance, with valley and penetration coverage options.
Open calculatorStarter Strip Calculator
Free starter strip shingle calculator. Enter your eave and rake measurements to calculate how many rolls or bundles of starter strip you need, with 2026 pricing.
Open calculatorDrip Edge Calculator
Free drip edge calculator for 2026. Enter your roof perimeter to find out how many pieces of drip edge flashing you need, choose between galvanized, aluminum, or painted, and get an installed cost estimate.
Open calculatorRoofing Nail Calculator
Free roofing nail calculator for 2026. Enter your roof area to find the exact number of nails or coil-nail boxes needed for 4-nail or 6-nail patterns, plus high-wind zone requirements and cost estimates.
Open calculatorRoof Plywood Calculator
Free roof plywood and OSB calculator for 2026. Enter your roof area to find the exact number of 4x8 sheets needed for new decking or partial replacement, with material and labor cost estimates.
Open calculatorFlashing Calculator
Free roofing flashing calculator for 2026. Count your roof penetrations and transitions to get exact quantities for step flashing, counter flashing, valley flashing, chimney flashing kits, and vent boots with cost estimates.
Open calculatorCedar Shake Calculator
Free cedar shake calculator for 2026. Enter your roof area to find the number of squares, bundles, and nails for cedar shakes or shingles. Choose shake vs shingle, grade, exposure, and get a full installed cost estimate with material grade comparisons.
Open calculatorRoofing Square Calculator
Free roofing square calculator for 2026. Convert square feet to roofing squares, squares to bundles, or use the complete converter for all directions including waste factor. Understand how many bundles per square for any shingle type.
Open calculatorArchitectural Shingle Calculator
Free architectural shingle calculator for 2026. Enter your roof area to find how many bundles of dimensional shingles you need, compare GAF Timberline, Owens Corning Duration, and CertainTeed Landmark, and get installed cost estimates by state.
Open calculatorWood Shingle Calculator
Free wood shingle calculator for 2026. Enter your roof area to find how many squares and bundles of wood shingles you need, choose cedar, pine, or redwood, add fire retardant treatment costs, and get installed cost estimates with specialized labor.
Open calculatorShingle Bundle Calculator
Free shingle bundle calculator for 2026. Convert square feet to bundles, bundles to coverage area, or build a complete shopping list with starter strips, ridge caps, and accessories for your roof.
Open calculatorValley Calculator
Free roof valley calculator for 2026. Enter the number and length of your roof valleys to find the right amount of valley flashing, ice & water shield, and valley metal. Compare open, closed, and woven valley methods with installed costs.
Open calculatorRoofing Felt Calculator
Free 2026 roofing felt calculator. Enter your roof area to find how many rolls of 15lb or 30lb felt paper underlayment you need. Compare felt vs synthetic underlayment costs, account for overlap, and get accurate material lists for your roofing project.
Open calculatorRoof Waste Calculator
Free 2026 roof waste calculator. Analyze your roof complexity to determine the recommended waste percentage, then calculate exactly how many extra shingles, underlayment, and other materials to order. Covers gable, hip, complex, and cut-up roof styles.
Open calculatorSynthetic Underlayment Calculator
Free synthetic underlayment calculator for 2026. Determine the exact number of synthetic underlayment rolls needed for your roof based on area, pitch, and overlap requirements. Compare brand-specific roll sizes and coverage for GAF FeltBuster, Owens Corning ProArmor, Grace Tri-Flex XT, and generic equivalents. See side-by-side cost comparison versus #15 and #30 felt paper with material strength, weight, UV exposure, and warranty differences to decide which underlayment is right for your project.
Open calculatorImpact Resistant Shingle Calculator
Free impact resistant shingle calculator for 2026. Estimate the number of Class 4 IR shingle bundles needed for your roof, calculate the cost premium over standard architectural shingles ($20-$40 more per square), and determine how quickly insurance discounts pay back the upgrade. Covers GAF Armor Shield II, Owens Corning Duration FLEX, CertainTeed NorthGate, and TAMKO StormFighter IR with state-specific insurance discount rates from 5% to 28% depending on your location and insurer.
Open calculatorProfessional Shingle Calculator
Professional-grade shingle calculator for contractors and homeowners. Compare GAF, Owens Corning, CertainTeed, and IKO side by side. Analyze 3-tab vs architectural vs premium lifecycle costs over 50 years. Plan crew size, timeline, and dumpster loads. Calculate ROI and monthly financing payments — all in one tool.
Open calculatorRoof Measurement
Measure roof area, pitch, slope, rise, run, overhangs, and dimensions accurately.
15 calculators
Roof Area Calculator
Free roof area calculator. Enter your building dimensions, roof pitch, and overhang to calculate accurate roof square footage for material ordering.
Open calculatorRoof Pitch Calculator
Free roof pitch calculator. Enter rise and run to find your roof pitch ratio, slope in degrees, and area multiplier. Includes methods to measure pitch from inside your attic.
Open calculatorRafter Length Calculator
Free rafter length calculator for 2026. Enter your building span and roof pitch to calculate the exact rafter length, select lumber sizes from span tables, and estimate board feet and lumber costs.
Open calculatorRoof Square Footage Calculator
Free 2026 roof square footage calculator. Enter your roof dimensions or building footprint and pitch to accurately calculate total roof area in square feet. Supports simple rectangular, L-shaped, T-shaped, and complex multi-section roofs.
Open calculatorRoof Slope Calculator
Free 2026 roof slope calculator. Convert any roof slope between pitch ratio (X/12), degrees, and percentage. Find your roof slope from rise and run measurements. Includes walkability ratings and shingle compatibility for every slope.
Open calculatorRoof Angle Calculator
Free 2026 roof angle calculator. Instantly convert any roof pitch (X/12) to degrees, radians, and slope percentage. Reverse-convert degrees back to pitch ratio. Includes a full comparison table of all standard pitches with walkability ratings and material compatibility.
Open calculatorRoof Overhang Calculator
Free 2026 roof overhang calculator. Enter your building width, number of stories, and climate zone to get recommended eave and rake overhang dimensions. Includes detailed soffit depth, fascia height, ventilation requirements, and material cost estimates.
Open calculatorRoof Rise Calculator
Free 2026 roof rise calculator. Enter your roof pitch and building span to calculate the total vertical rise from the wall top plate to the ridge. Reverse-calculate pitch from measured rise and run. Includes usable attic space estimation based on roof rise and building width.
Open calculatorRoof Span Calculator
Free roof span calculator for 2026. Enter rafter length and pitch, or rise and run, to instantly compute horizontal span and total building width including overhangs. Essential for truss ordering, beam sizing, and structural engineering.
Open calculatorRoof Run Calculator
Free roof run calculator for 2026. Enter roof pitch and rise, or rafter length and pitch, to calculate the horizontal run distance. Essential for rafter cuts, truss design, soffit length, and gutter placement.
Open calculatorAttic Floor Area Calculator
Free attic floor area calculator for 2026. Determine how much usable attic floor area you have based on building width, length, and roof pitch. Calculate the zones where ceiling height exceeds the 7-foot IRC minimum for habitable rooms, the 5-foot threshold for storage, and the 4-foot minimum for any use. Includes floor reinforcement cost estimates for attic conversions and bonus room planning.
Open calculatorHip & Ridge Length Calculator
Free hip and ridge length calculator for 2026. Compute main ridge, hip lines, and valley linear feet from building length, width, and roof pitch. Determine how many bundles of ridge cap shingles, linear feet of ridge vent, and hip shingle pieces you need. Covers standard hip roofs, cross-hip, Dutch hip, and combination roof geometries with automatic material quantity calculation.
Open calculatorEave Length Calculator
Free eave length calculator for 2026. Compute total eave perimeter from building dimensions, overhangs, and roof type — gable, hip, L-shape, or complex. Convert eave linear feet into starter strip rolls, drip edge pieces, gutter runs, and ice & water shield rolls. Accounts for garage eaves, dormer eaves, and overhang additions to ensure complete material coverage with no gaps.
Open calculatorRoof Measurement From Ground Calculator
Free roof measurement from ground calculator for 2026. Estimate your total roof area without climbing a ladder or using drone technology. Measure your home footprint from the ground using a tape measure, property survey, or satellite imagery. Estimate roof pitch using the visible siding course method or visual angle guides. Apply pitch multipliers and complexity factors for gable, hip, L-shape, and complex roof geometries. Get an accurate roof area estimate within 5-10% for material ordering, contractor bid verification, and insurance claim preparation.
Open calculatorRoof Valley Length Calculator
Free roof valley length calculator for 2026. Determine the exact length of a roof valley from the dimensions and pitch of each intersecting roof plane using trigonometric slope calculations. Handles equal-pitch and different-pitch intersections with step-by-step geometry. Convert valley length into ice and water shield rolls and W-metal valley flashing linear footage needed. Plan for multiple valleys with equal or varying lengths across complex roof layouts.
Open calculatorCost & Budget
Estimate total project costs including materials, labor, tear-off, and financing.
13 calculators
Roof Replacement Cost Calculator
Free 2026 roof replacement cost calculator. Enter your roof size, material, and location to get an accurate estimate of total project cost with detailed breakdown.
Open calculatorRoof Repair Cost Calculator
Free 2026 roof repair cost calculator. Enter your repair type, damaged area, and location to get an accurate estimate for leak repair, flashing replacement, storm damage patches, and partial re-roofing.
Open calculatorRoof Financing Calculator
Free 2026 roof financing calculator. Compare HELOC, personal loan, and contractor financing to find the best way to pay for your new roof. See monthly payments, total interest, and true cost.
Open calculatorMetal Roof Cost Calculator
Free 2026 metal roof cost calculator. Compare standing seam, corrugated, and stone-coated steel costs with detailed material and labor breakdowns. See lifetime value vs asphalt shingles over 20-50 years.
Open calculatorNew Roof Cost Calculator
Free new roof cost calculator for 2026. Enter roof area, material preference, and location to get an accurate total cost estimate including materials, labor, permits, tear-off, and decking. Compare asphalt, metal, tile, and slate side by side.
Open calculatorRoof Tear-Off Cost Calculator
Free roof tear-off cost calculator for 2026. Enter roof area, number of layers, and material type to estimate removal labor, dumpster rentals, disposal fees, and total tear-off cost. Compare DIY vs professional removal.
Open calculatorRoof Labor Cost Calculator
Free roof labor cost calculator for 2026. See what roofers charge per square for re-roofs, new construction, and repairs. Compare regional labor rates with state-adjusted high/low/average pricing.
Open calculatorAsphalt Shingle Cost Calculator
Free asphalt shingle cost calculator for 2026. Compare 3-tab, architectural, and premium shingle pricing including underlayment, labor, and tear-off by state. See real brand pricing from GAF, Owens Corning, CertainTeed, and IKO with actual product lines.
Open calculatorRoof ROI Calculator
Free roof ROI calculator for 2026. Estimate how much a new roof adds to your home value, annual energy savings from reflective or insulated materials, and combined long-term return on investment. Compare asphalt, metal, tile, and slate ROI side by side.
Open calculatorTile Roof Cost Calculator
Free tile roof cost calculator for 2026. Enter your roof area and tile type to get accurate cost estimates for clay, concrete, and synthetic tile roofing — including structural reinforcement, batten systems, specialized labor, tear-off, and a 50-year lifetime value comparison against asphalt shingles.
Open calculatorSlate Roof Cost Calculator
Free slate roof cost calculator for 2026. Enter your roof area and slate type to estimate material costs, copper flashings and accessories, specialized installation labor, structural requirements, and long-term value amortized over a 100+ year lifespan versus cheaper roofing alternatives.
Open calculatorCedar Shake Cost Calculator
Free cedar shake roof cost calculator for 2026. Get accurate pricing for cedar shakes versus shingles, grade selection, fire retardant treatment, staining and maintenance schedules, and a 25-year total ownership cost analysis including periodic retreatment and eventual replacement.
Open calculatorDormer Cost Calculator
Free dormer cost calculator for 2026. Estimate the total project cost to add a shed, gable, or hip dormer to your home. Includes framing, roofing, siding, window installation, and interior finishing costs broken down by dormer type, size, and your state. Get realistic price ranges based on 2026 contractor rates for single or multiple dormer additions with structural engineering and permit fees.
Open calculatorVentilation & Insulation
Calculate attic ventilation, ridge vents, soffit vents, insulation R-values, and energy.
20 calculators
Roof Ventilation Calculator
Free roof ventilation calculator. Enter your attic size to calculate required Net Free Area (NFA), ridge vent length, soffit vent count, and attic fan CFM.
Open calculatorGutter Calculator
Free gutter calculator for 2026. Enter your roof perimeter to estimate linear feet of gutters, number of downspouts, hangers, corners, and total cost by material (aluminum, vinyl, steel, copper).
Open calculatorSoffit Vent Calculator
Free soffit vent calculator for 2026. Enter your attic area to determine required NFA (Net Free Area), soffit vent count, and check your balanced ventilation system.
Open calculatorRidge Vent Calculator
Free ridge vent calculator for 2026. Enter your ridge length and attic area to determine NFA, check code balance with soffit vents, and estimate material and labor costs.
Open calculatorDownspout Calculator
Free downspout calculator. Enter your roof area, gutter size, and local rainfall intensity to determine the number of downspouts, optimal size (2×3 or 3×4), placement spacing, and total cost for materials and installation.
Open calculatorGutter Guard Calculator
Free gutter guard calculator for 2026. Enter gutter length to estimate linear feet of guards needed, compare mesh, micro-mesh, reverse-curve, foam, and brush types, and calculate cost vs. cleaning savings over 10-25 years.
Open calculatorAttic Fan Calculator
Free attic fan calculator for 2026. Enter attic square footage to calculate required CFM airflow, compare solar-powered vs electric fan costs and performance, and get a complete system estimate including fan, thermostat, solar panel, and wiring.
Open calculatorAttic Ventilation Calculator
Free attic ventilation calculator. Enter your attic square footage, vapor barrier status, and roof configuration to determine required NFA per IRC code, design a balanced intake-exhaust system, and generate a specific vent product list with quantities and costs for 2026.
Open calculatorGable Vent Calculator
Free gable vent calculator for 2026. Enter your attic floor area, existing intake and exhaust ventilation, and vapor barrier status to determine the exact gable vent net free area (NFA) you need, how many vents to install, recommended vent dimensions, and installed cost — following IRC building code 1/150 and 1/300 ratios.
Open calculatorTurbine Vent Calculator
Free turbine vent calculator for 2026. Enter your attic area, ceiling height, and climate zone to determine the number of wind-driven turbine vents needed for proper attic ventilation — including CFM ratings by wind speed, NFA equivalence, turbine diameter selection, spacing guidelines, and installed cost estimates.
Open calculatorRadiant Barrier Calculator
Free radiant barrier calculator for 2026. Estimate how much radiant barrier foil or spray-on coating you need for your attic, project cooling cost savings by IECC climate zone, and get accurate material and labor cost breakdowns by state. Covers staple-up foil, draped foil, and spray-on radiant barrier methods with ROI analysis for hot and mixed climates.
Open calculatorVentilation Balance Calculator
Free ventilation balance calculator for 2026. Diagnose whether your attic ventilation system has the correct balance between intake (soffit vents) and exhaust (ridge, turbine, or power vents). Calculate Net Free Area for each vent type, check the 50/50 intake-to-exhaust ratio, identify short-circuiting risks, and get specific recommendations for adding vents to achieve proper balance per IRC building code requirements.
Open calculatorCondensation Risk Calculator
Free condensation risk calculator for 2026. Diagnose attic moisture problems by calculating the dew point temperature based on indoor conditions, assessing risk factors like insulation R-value and ventilation NFA, and generating a prevention plan with vapor barrier and air sealing recommendations. Ideal for cold-climate homeowners experiencing frost on nail tips, wet insulation, or ceiling staining from attic condensation.
Open calculatorCathedral Ceiling Insulation Calculator
Free cathedral ceiling insulation calculator for 2026. Determine the best insulation method for vaulted and cathedral ceilings where there is no attic space. Compare cavity-only fiberglass, closed-cell spray foam, and hybrid cavity-plus-rigid-above-deck assemblies. Calculate R-value by rafter depth, vent channel requirements per IRC 2021, and get full installed cost estimates including vapor barrier and vent baffles for your climate zone and state.
Open calculatorRoof Ventilation Ratio Calculator
Free roof ventilation ratio calculator for 2026. Enter your attic square footage and existing vents to calculate your Net Free Area (NFA) ratio against IRC code requirements. Determine whether you qualify for the reduced 1:300 ratio or need the standard 1:150 ratio based on intake/exhaust balance and vapor barrier status. Get a pass/fail compliance grade and a specific fix plan showing exactly which vents to add to reach code compliance.
Open calculatorRoof Vent Pipe Calculator
Free roof vent pipe calculator for 2026. Determine how many plumbing vent pipes penetrate your roof based on bathroom count, kitchen, laundry, and individual fixture tallies. Calculate pipe diameter using IPC and UPC drain fixture unit (DFU) tables, evaluate options to reduce penetrations with wet venting, circuit venting, and air admittance valves (AAVs), and get a complete roof penetration plan with pipe boot sizes, flashing specifications, and installation cost estimates.
Open calculatorRoof Ventilator Calculator
Free power roof ventilator calculator for 2026. Size commercial and industrial roof ventilators by building volume, required air changes per hour, and CFM capacity. Covers direct-drive and belt-drive units in 12-inch through 48-inch sizes for warehouses, factories, kitchens, and mechanical rooms. Includes motor horsepower selection, curb adapter sizing, electrical wiring cost, and total installed price by state.
Open calculatorSoffit Vent Area Calculator
Free soffit vent area calculator for 2026. Determine the Net Free Area (NFA) of individual soffit vents by gross opening size, screen mesh type, and louver style. Compare continuous soffit strip vents versus individual rectangular or circular vents for optimal intake airflow distribution. Calculate vent placement spacing along the soffit to achieve your target total NFA. Covers 16x8, 16x6, 8x16, and 4-inch round vents with insect screen, louver, and rain-screen deductions.
Open calculatorCool Roof Calculator
Free cool roof calculator for 2026. Estimate Solar Reflectance Index (SRI), solar reflectance, thermal emittance, cooling energy savings of 10-30%, and payback period for cool roof coatings, membranes, and reflective shingles. Covers Title 24 compliance (SRI>78), ENERGY STAR requirements, utility rebates, and cost comparisons for white coatings, reflective membranes, and cool-color metal roofing. Calculate annual savings by climate zone, electricity rate, and building type with 2-5 year payback estimates.
Open calculatorAsphalt Shingle Color Heat Calculator
Free asphalt shingle color heat calculator for 2026. Compare how black, dark brown, medium gray, tan, and white shingle colors affect your roof surface temperature, attic heat gain, and annual cooling costs. Enter your climate zone, roof area, and current shingle color to see the temperature difference and energy savings from switching to a lighter or ENERGY STAR IR-reflective shingle. Includes attic temperature estimates, AC load reduction percentages, and annual dollar savings by region.
Open calculatorMetal & Specialty Materials
Calculate for metal, tile, slate, EPDM, TPO, and other specialty materials.
19 calculators
Metal Roof Calculator
Free metal roof calculator for standing seam, corrugated, and metal shingle roofing. Enter your dimensions to get panel count, fastener quantity, and cost estimate.
Open calculatorTile Roof Calculator
Free tile roof calculator for 2026. Enter roof area to estimate tiles per square, pallets needed, structural weight, batten layout, and total installed cost for clay, concrete, and synthetic tile roofing.
Open calculatorSlate Roof Calculator
Free slate roof calculator for 2026. Enter roof area and slate specifications to estimate squares of slate, total weight, headlap requirements, and installed cost for natural and synthetic slate roofs.
Open calculatorStanding Seam Metal Roof Calculator
Free standing seam metal roof calculator. Enter your roof dimensions, panel width, and material grade to estimate panel count, clips, ridge cap, eave trim, and total cost for your standing seam project in 2026.
Open calculatorCorrugated Metal Roof Calculator
Free corrugated metal roof calculator for 2026. Enter your roof dimensions to find panel count, screw quantity, ridge cap and trim pieces, and get a full installed cost estimate for galvanized, painted, or Galvalume panels.
Open calculatorEPDM Roof Calculator
Free EPDM roof calculator for 2026. Enter your flat or low-slope roof dimensions to calculate rubber membrane square footage, bonding adhesive gallons, seam tape rolls, termination bar, and get an installed cost estimate with BUR and TPO comparisons.
Open calculatorTPO Roof Calculator
Free TPO roof calculator for 2026. Enter your flat or low-slope roof dimensions to find the number of TPO membrane rolls, insulation boards, fasteners, and get installed cost estimates comparing fully-adhered vs mechanically-attached systems by state.
Open calculatorBuilt-Up Roof Calculator
Free built-up roof (BUR) calculator for 2026. Enter roof area and system type to estimate felt plies, asphalt quantity, gravel or slag aggregate, insulation boards, and total installed cost for tar and gravel roofing systems.
Open calculatorModified Bitumen Calculator
Free modified bitumen roof calculator for 2026. Enter roof area to estimate mod-bit rolls, base sheet, cap sheet with granule color, adhesive or torch fuel, and total installed cost. Compare APP vs SBS and torch vs cold-applied vs self-adhered methods.
Open calculatorPVC Roof Calculator
Free PVC roof calculator for 2026. Enter roof area to estimate PVC membrane rolls, thickness options (50/60/80 mil), insulation, mechanical fasteners, edge detail, and total installed cost. Compare PVC vs TPO and EPDM for chemical resistance, lifespan, and restaurant/grease environments.
Open calculatorMetal Roof Screw Calculator
Free metal roof screw calculator for 2026. Determine the exact number of screws required for your metal roofing project based on roof area, panel width, screw spacing pattern, and edge fastening requirements. Covers exposed-fastener panels (R-panel, PBR, corrugated) with proper field and overlap screw counts. Includes screw type selection, washer sizing, recommended driver bits, and full cost estimate with sealant and replacement screws by state.
Open calculatorStanding Seam Clip Calculator
Free standing seam clip calculator for 2026. Determine the exact number of concealed clips needed for your standing seam metal roof based on panel width, clip spacing, roof dimensions, and clip type. Covers fixed clips at the eave, floating clips for thermal expansion, and transition clips for different zones. Includes stainless steel and galvanized clip options with pricing for residential and commercial standing seam installations.
Open calculatorRoof Snow Guard Calculator
Free roof snow guard calculator for 2026. Determine the number and placement of snow guards or snow fences for standing seam and exposed-fastener metal roofs. Covers pad-style guards, pipe rail systems, and fence-style barriers with staggered and linear layouts. Includes row spacing by slope length, snow load zone mapping, material selection for different panel profiles, and total installed cost by state for complete snow retention systems.
Open calculatorPurlin Calculator
Free purlin calculator for 2026. Determine the correct purlin size, on-center spacing, number of rows, and total linear footage needed to support metal roof panels. Covers wood purlins (2x4 and 2x6) for short spans and steel C-purlins and Z-purlins for longer spans. Includes spacing tables by panel gauge and profile, fastener counts for purlin-to-rafter connections, and material costs by state for complete metal roof framing estimates.
Open calculatorBatten Calculator
Free batten calculator for 2026. Determine the number of horizontal batten strips, counter-batten rows, and total linear footage needed for tile and slate roof installations. Covers concrete tile, clay tile, and natural slate with correct exposure and spacing values. Calculates 1x2 and 2x2 batten boards, ring-shank nails, and counter-batten materials for ventilated tile underlayment systems. Includes material cost estimates by state and layout diagrams for proper installation.
Open calculatorMetal Panel Calculator
Free metal panel calculator for 2026. Estimate the exact number of exposed-fastener metal roofing panels, ridge cap, gable trim, eave trim, inside and outside foam closures, and self-drilling screws needed for your roof. Covers 26-inch and 36-inch wide panels in 29ga and 26ga steel, available in 8-16 foot lengths. Includes panel layout with 2-inch side overlap, trim linear footage, closure strip counts, and total cost by state with material and labor breakdowns.
Open calculatorGreen Roof Calculator
Free green roof calculator for 2026. Estimate living roof system layers, saturated weight per square foot, structural load requirements, plant coverage, irrigation needs, and installed cost for extensive sedum roofs and intensive rooftop gardens. Covers drainage mats, root barriers, growing media depth, and plant selection by climate zone. Compare extensive systems at $15-$30/sq ft vs. intensive at $50-$200/sq ft with maintenance budgets and stormwater retention credits.
Open calculatorMetal Roof Expansion Calculator
Free metal roof expansion calculator for 2026. Determine the thermal movement of steel, aluminum, copper, and zinc roof panels based on panel length and your local temperature swing. Calculate required expansion gaps at ridges, eaves, and panel ends, plus proper floating clip spacing and fixed-point placement. Avoid costly oil-canning, fastener pull-out, and panel buckling by designing for thermal expansion before installation.
Open calculatorMetal Roof Oil Canning Calculator
Free metal roof oil canning calculator for 2026. Evaluate your standing seam panel configuration for visible waviness risk based on panel width, metal gauge, color choice, and substrate flatness. Compare flat, ribbed, and striated panel profiles with cost premiums. Get recommendations for pencil ribs, bead stiffeners, and gauge upgrades that reduce oil canning while maintaining the clean aesthetic of standing seam metal roofing. Includes cost comparison by panel profile and gauge for informed decision-making.
Open calculatorRoof Types
Estimate materials for gable, hip, mansard, gambrel, shed, flat, and specialty roof types.
10 calculators
Gable Roof Calculator
Free gable roof calculator. Enter your building length, width, and pitch to calculate roof area, shingle bundles, ridge cap, eave trim, and rafter framing requirements for a standard gable roof.
Open calculatorHip Roof Calculator
Free hip roof calculator with accurate area calculations for rectangular, square, and cross-hip roofs. Enter building dimensions and pitch to get material estimates and a hip vs gable cost comparison.
Open calculatorFlat Roof Calculator
Free flat roof calculator for EPDM, TPO, BUR, and modified bitumen systems. Enter dimensions to estimate membrane, insulation, drainage, and total installed cost for 2026.
Open calculatorShed Roof Calculator
Free shed roof calculator for mono-pitch roofs. Enter length, width, and pitch to estimate shingles or metal panels, rafters, and total project cost for 2026.
Open calculatorGambrel Roof Calculator
Free 2026 gambrel roof calculator. Enter your building dimensions and upper/lower slope pitches to calculate total roof area, shingle quantities, and gambrel truss framing dimensions. Ideal for barns, sheds, garages, and gambrel-style homes.
Open calculatorDormer Roof Calculator
Free 2026 dormer roof calculator. Enter dormer type, width, and height to calculate roof area, shingle quantities, and estimated construction cost. Supports gable, shed, and hip dormers with single or multiple dormer configurations.
Open calculatorA-Frame Roof Calculator
Free 2026 A-frame roof calculator. Enter your base width, building length, and pitch to calculate total roof area, shingle or metal quantities, and rafter/purlin structural sizing. Designed for A-frame cabins, homes, and vacation properties.
Open calculatorMansard Roof Calculator
Free 2026 mansard roof calculator. Enter your building dimensions, upper flat slope, and lower steep slope to calculate total mansard roof area, material quantities for each section (flat membrane top + shingles or slate sides), and estimated cost. Ideal for French-style homes, commercial buildings, and mansard renovations.
Open calculatorLean-To Roof Calculator
Free 2026 lean-to roof calculator. Enter your lean-to length, width, and pitch to calculate roof area, shingle or metal panel quantities, ledger board attachment requirements, and total project cost. Covers porch roofs, carport covers, home additions, and commercial lean-to structures.
Open calculatorDutch Gable Roof Calculator
Free Dutch gable roof calculator for 2026. Enter your roof dimensions to calculate total area combining hip and gable sections, estimate shingles, framing, ridge caps, fascia, and total installed cost. Includes worked formulas for the unique hip-gable hybrid geometry.
Open calculatorStructural
Assess load capacity, trusses, rafters, snow loads, and structural requirements.
23 calculators
Roof Truss Calculator
Free roof truss calculator. Enter your building length, span, pitch, and spacing to estimate truss count, rafter and chord lengths, and total truss cost for residential and commercial projects.
Open calculatorSnow Load Calculator
Free snow load calculator per ASCE 7. Enter your ground snow load, roof pitch, exposure category, and thermal condition to calculate flat-roof and sloped-roof snow loads, drift loads, and check against your roof's structural capacity.
Open calculatorRoof Load Calculator
Free roof load calculator. Enter your roofing materials, roof dimensions, snow load, and wind zone to calculate total dead load, live load, and combined load in PSF — then check if your roof structure can handle it safely.
Open calculatorWind Load Calculator
Free roof wind load calculator. Enter your basic wind speed, exposure category, and building height to calculate design wind pressures in PSF for field, edge, and corner roof zones per ASCE 7-22, plus fastener pattern requirements for shingle and metal roofs in 2026.
Open calculatorRafter Calculator
Free 2026 rafter calculator. Determine how many rafters you need, what lumber size is required for your span and load, and generate a complete material list including ridge board, collar ties, and total board feet. Based on IBC/IRC 2024 span tables.
Open calculatorRafter Span Calculator
Free 2026 rafter span calculator. Look up maximum allowable rafter spans from IBC/IRC 2024 tables based on lumber size, species and grade, spacing, and design load. Compare 2x6 through 2x12 side by side and find the most cost-effective lumber size for your span.
Open calculatorRoof Joist Calculator
Free 2026 roof joist calculator. Determine how many ceiling joists you need, what lumber size is required for your span and ceiling load, and estimate total materials and labor cost. Based on IBC/IRC 2024 span tables for ceiling joists with and without attic storage.
Open calculatorRidge Beam Calculator
Free ridge beam calculator for 2026. Determine the correct structural ridge beam size for cathedral ceilings and vaulted roof framing where rafter ties or ceiling joists cannot be used. Calculate beam depth and width for LVL (laminated veneer lumber) and solid sawn lumber based on span, rafter spacing, roof dead and live loads, snow load, and species-grade allowable stress values. Includes post sizing, bearing plate requirements, and connection hardware specifications.
Open calculatorCollar Tie Calculator
Free collar tie calculator for 2026. Determine the correct collar tie spacing, lumber size, total board count, and nail or connector requirements to prevent rafter separation at the ridge. Covers IRC code requirements for collar tie placement in the upper one-third of the attic space, maximum 4-foot on-center spacing, and minimum fastener schedules. Includes comparison to rafter ties and guidance on when each is required for proper roof structural integrity.
Open calculatorBirdsmouth Cut Calculator
Free birdsmouth cut calculator for 2026. Determine the exact seat cut depth, heel height above plate (HAP), plumb cut angle, and tail length for your rafter birdsmouth joint. Supports all standard lumber sizes from 2x4 to 2x12, all roof pitches from 1/12 to 12/12, and verifies IRC maximum notch depth limits to ensure structural integrity. Essential for stick-framing roofs and cutting rafters on site.
Open calculatorRoof Weight Calculator
Free roof weight calculator for 2026. Determine total dead load in pounds per square foot (PSF) for your complete roofing assembly including decking, underlayment, roofing material, and accessories. Compare asphalt shingles (2-4 PSF), concrete tile (8-12 PSF), slate (10-15 PSF), and standing seam metal (1-2 PSF). Check whether your roof framing can support the load or needs structural reinforcement before a material upgrade.
Open calculatorRoof Cricket Calculator
Free roof cricket calculator for 2026. Determine the required cricket dimensions behind a chimney or roof-to-wall intersection per IRC R903.2.2. Calculate cricket height, valley length, plywood sheathing area, ice & water shield coverage, step flashing pieces, and counter flashing length. Includes full material and labor cost estimates for building and shingling a chimney cricket or saddle to prevent water pooling and ice dam damage.
Open calculatorGarage Roof Calculator
Free garage roof calculator for 2026. Enter your garage dimensions and roof pitch to calculate exact shingle bundles, underlayment rolls, drip edge, ridge cap, and ventilation requirements. Covers 1-car, 2-car, and 3-car garages with gable or hip roofs. Includes complete material quantities and installed cost estimates by state for new construction and re-roofing projects.
Open calculatorPorch Roof Calculator
Free porch roof calculator for 2026. Plan a covered porch or patio roof by calculating roofing panels, shingles, rafters, posts, ledger board hardware, and total installed cost. Covers shed-style, hip, and gable porch roofs in widths from 8 to 30 feet. Includes structural post spacing, rafter sizing, ledger attachment details, and complete project cost estimates by state for both DIY and professional installation.
Open calculatorPergola Roof Calculator
Free pergola roof calculator for 2026. Determine the exact number of polycarbonate sheets, corrugated metal panels, or shade sail fabric needed to cover your pergola. Includes purlin spacing and quantity, self-drilling screws, UV sealant, and closure strips. Calculate coverage area with proper 2-inch overlap at seams, purlin requirements every 24 inches, and complete installed cost for DIY or professional installation.
Open calculatorCarport Roof Calculator
Free carport roof calculator for 2026. Estimate materials and costs for building or re-roofing a carport including corrugated metal panels, purlins, steel or wood framing, and concrete footings. Covers 1-car, 2-car, and RV carports in flat, gable, and lean-to configurations. Compare pre-fabricated carport kits versus custom-built options with complete cost breakdowns by state for both DIY assembly and professional installation.
Open calculatorRoof Truss Spacing Calculator
Free roof truss spacing calculator for 2026. Find the optimal on-center spacing for roof trusses based on building span, combined dead load, live load, and snow load requirements. Compare 16-inch versus 24-inch OC spacing for fink, howe, and pratt truss types with different lumber grades. Includes board-feet estimates for chord and web lumber, engineered truss cost per linear foot, and code-compliant spacing tables for spans up to 40 feet.
Open calculatorRoof Sheathing Calculator
Free roof sheathing calculator for 2026. Plan the exact number of 4x8 sheathing sheets for your roof with optimized stagger pattern layout, H-clip placement at unsupported edges, and code-compliant nailing schedules. Covers 7/16-inch OSB for 24-inch OC rafters, 15/32-inch plywood for enhanced strength, and DensGlass for fire-rated assemblies. Includes 1/8-inch expansion gap allowances, 8d nail quantities at 6-inch OC edges and 12-inch OC field, and regional material cost estimates.
Open calculatorPolycarbonate Roof Calculator
Free polycarbonate roof calculator for 2026. Estimate twin-wall and multiwall polycarbonate sheet counts, purlin spacing requirements, thermal R-value, and installed cost for patio covers, greenhouses, sunrooms, carports, and pergola roofs. Covers 6mm, 10mm, 16mm, and 25mm panel thicknesses with UV protection ratings, light transmission percentages, and snow/wind load capacity. Compare clear, opal, and bronze tint options with pricing from $2-$8 per square foot by region.
Open calculatorRoof Tie-In Calculator
Free roof tie-in calculator for 2026. Estimate the materials and cost to connect a new roof structure to an existing roof for home additions, garage extensions, and bump-outs. Covers open valley and closed valley tie-in methods, step flashing for sidewall connections, ice and water shield at all intersections, and shingle weaving requirements. Includes labor estimates for this specialized, high-skill work priced per linear foot by state.
Open calculatorHurricane Strap Calculator
Free hurricane strap calculator for 2026. Determine the exact count, type, and cost of hurricane straps and rafter tie-down clips for new construction or retrofit projects. Covers Simpson Strong-Tie H2.5A, H10, and H1 models with uplift load ratings, 10d nail requirements, and per-connection installed pricing. Includes Florida Building Code requirements and wind zone guidance for coastal and inland homes across all hurricane-prone states.
Open calculatorRoof Material Weight Comparison Calculator
Free roof material weight comparison calculator for 2026. Compare dead load weights of all major roofing materials side by side — asphalt shingles at 2.5 PSF, metal at 1.5 PSF, wood shake at 3.5 PSF, concrete tile at 9.5 PSF, clay tile at 10 PSF, slate at 12 PSF, and extensive green roofing at 20 PSF. Check whether your existing roof structure can support a heavier material upgrade and estimate reinforcement costs if framing modifications are needed.
Open calculatorRoof Overhang Extension Calculator
Free roof overhang extension calculator for 2026. Estimate the lumber, hardware, and labor needed to extend your existing roof overhang from its current depth to your desired projection. Calculate lookout rafter size and count, subfascia board footage, blocking and connector requirements, plus new fascia and soffit materials. Covers extensions up to 24 inches using standard lookout framing and flags projects over 24 inches that require structural engineering.
Open calculatorInsurance & Damage
Calculate insurance claims, depreciation, hail/storm/wind damage repair costs.
6 calculators
Hail Damage Calculator
Free hail damage calculator. Enter hail size, roof age, and material type to assess damage percentage, compare repair vs full replacement cost, and estimate your insurance claim payout after deductible and depreciation.
Open calculatorRoof Insurance Claim Calculator
Free roof insurance claim calculator. Enter your roof replacement cost, age, deductible, and policy type to estimate your insurance payout, depreciation, recoverable depreciation, and total out-of-pocket expense.
Open calculatorStorm Damage Roof Calculator
Free storm damage roof calculator. Select your storm type, damage extent, and roof details to get a repair cost estimate, understand depreciation, and calculate your expected insurance claim payout for 2026.
Open calculatorRoof Depreciation Calculator
Free roof depreciation calculator. Enter your roof age, material type, and replacement cost to determine current value using linear depreciation, understand RCV vs ACV insurance payouts, and identify the optimal time to replace based on remaining value vs repair costs in 2026.
Open calculatorWind Damage Calculator
Free wind damage calculator for roofs. Enter wind speed, damage extent, and shingle condition to get a detailed damage assessment, itemized repair estimate by damage type, and expected insurance claim payout with deductible calculations for 2026.
Open calculatorRoof Tarp Calculator
Free emergency roof tarp calculator for 2026. Determine the correct tarp size with proper overlap and ridge coverage for storm-damaged roofs, calculate the number of 2x4 nailer boards, screws, and sandbags needed for secure anchoring, and estimate material and emergency labor costs. Covers blue poly tarps, heavy-duty UV-resistant tarps, and shrink-wrap options with insurance claim guidance for temporary repairs.
Open calculatorSolar & Energy
Plan solar installations and calculate energy savings on your roof.
5 calculators
Solar Roof Calculator
Free solar roof calculator. Enter your roof dimensions, location, and electric bill to estimate solar panel capacity, annual energy savings, payback period, and the cost of combining a roof replacement with solar panel installation.
Open calculatorAttic Insulation Calculator
Free attic insulation calculator. Enter your climate zone, current insulation, and attic area to determine your target R-value, material quantity (batts, blown-in, or spray foam), installation cost, and estimated annual energy savings with payback period for 2026.
Open calculatorRoof Insulation Calculator
Free roof insulation calculator for roof deck and cathedral ceiling applications. Enter your climate zone, current R-value, and roof area to determine the insulation gap, estimate material quantities and costs for rigid foam, spray foam, or fiberglass batts, and calculate annual HVAC savings with payback period for 2026.
Open calculatorRoof Energy Savings Calculator
Free roof energy savings calculator for 2026. Estimate how much you can save on heating and cooling by upgrading to a cool roof, improving attic insulation, or optimizing roof ventilation. Includes climate zone adjustments, ENERGY STAR rated material savings, and combined improvement payback analysis.
Open calculatorSolar Panel Weight Calculator
Free solar panel weight calculator for 2026. Enter your panel count, type, and racking system to calculate total added weight in PSF, compare against your roof's structural capacity, and get reinforcement cost estimates if the system exceeds your roof's load limits.
Open calculatorMaintenance & Repair
Estimate repair costs, coatings, moss treatment, safety equipment, and patch materials.
12 calculators
Roof Coating Calculator
Free roof coating calculator for 2026. Enter your roof area and coating type to estimate gallons needed, coverage per coat, dry mil thickness, surface prep requirements, and total installed cost for elastomeric, silicone, and acrylic roof coatings on flat and low-slope commercial and residential roofs.
Open calculatorRoof Moss Treatment Calculator
Free roof moss treatment calculator for 2026. Enter your roof area and moss severity to calculate zinc strip footage, moss killer concentrate gallons, professional cleaning costs, and long-term prevention system pricing including copper and zinc ridge strips with installation labor estimates.
Open calculatorRoof Sealant Calculator
Free roof sealant calculator for 2026. Enter your roof penetrations, seam lengths, and repair areas to determine the exact number of caulk tubes, sealant cartridges, and gallons of roof cement needed — including product recommendations, re-seal schedules, and material plus labor costs by state.
Open calculatorRoof Painting Calculator
Free roof painting calculator for 2026. Estimate how many gallons of roof paint and primer you need, plan surface preparation including pressure washing and repairs, and get accurate cost breakdowns for DIY and professional roof painting. Covers metal roofs, concrete tile, clay tile, and asphalt shingles with cool roof reflective paint options.
Open calculatorRoof Ladder Safety Calculator
Free roof ladder safety calculator for 2026. Determine the correct extension ladder length, base placement distance using the OSHA 4:1 rule, required weight duty rating, and safe reach height for accessing your roof. Covers Type I, Type IA, and Type IAA ladders with load calculations that include worker weight plus tools. Essential for DIY roofers and contractors ensuring OSHA-compliant roof access safety.
Open calculatorRoof Deck Inspection Calculator
Free roof deck inspection calculator for 2026. Estimate the number of plywood or OSB sheathing sheets that will need replacement during your re-roof project based on roof age, visible damage, leak history, and regional climate factors. Get accurate sheet counts, material costs for CDX plywood and OSB, and labor pricing to help budget for hidden deck repair costs that catch homeowners off guard.
Open calculatorRoof Anchor Calculator
Free roof anchor calculator for 2026. Determine how many anchor points you need for your roof based on area, pitch, worker count, and OSHA fall protection requirements (29 CFR 1926.502). Calculate minimum rope lengths, swing fall radius clearances, and get a complete equipment list including anchors, harnesses, lanyards, and lifelines with current pricing for permanent and temporary roof anchor systems.
Open calculatorRoof Inspection Cost Calculator
Free roof inspection cost calculator for 2026. Get accurate pricing for professional roof inspections including basic visual walk-over, drone aerial surveys, infrared thermal imaging for heat loss and moisture detection, and nuclear or impedance moisture scanning. Compare inspection types, understand what each includes, and estimate total cost by roof size, pitch, number of stories, and your state. Ideal for homeowners planning annual maintenance, real estate buyers, and property managers scheduling portfolio inspections.
Open calculatorZinc Strip Calculator
Free zinc strip calculator for 2026. Calculate the linear footage of zinc or copper ridge strip needed to permanently prevent algae black streaks and moss growth on asphalt shingle roofs. Compare zinc versus copper strip materials by cost, lifespan, and effectiveness. Determine strip width, nail spacing, and additional mid-roof strip runs for large or heavily shaded north-facing slopes. Get total material and installation cost estimates by state for this long-lasting physical prevention method.
Open calculatorRoof Patch Calculator
Free roof patch calculator for 2026. Estimate the exact materials needed to repair a small damaged roof area including shingle bundles, roofing cement, sealant tubes, galvanized nails, and tar paper. Covers storm damage, missing shingles, small leaks, and worn patches. Compare DIY material costs against professional service call pricing by state to decide the most cost-effective repair approach.
Open calculatorRoof Access Calculator
Free roof access calculator for 2026. Compare scaffolding, extension ladders, and boom lifts for safe roof access by eave height, roof pitch, project duration, and crew size. Covers OSHA fall protection requirements above 6 feet, guardrail regulations above 10 feet, scaffold rental at $15-$30/day/section, boom lift rental at $300-$800/day, and ladder safety angles. Includes fall protection equipment costs, setup labor, and total access cost comparison to find the safest and most cost-effective solution for your roofing project.
Open calculatorRoof Sagging Repair Calculator
Free roof sagging repair calculator for 2026. Diagnose the cause of your sagging roof by entering sag location, depth, span, and roof age. Compare repair methods including rafter sistering, post and beam reinforcement, jacking with structural support, and partial reframing. Estimate material and structural labor costs by severity level and state. Understand when a structural engineer inspection is required and what causes roof sag from undersized rafters to water damage, overloading, and removed bearing walls.
Open calculatorProject Planning
Plan your project — commercial, flat roof, skylights, trim, permits, dumpsters, and more.
36 calculators
Skylight Calculator
Free skylight calculator for 2026. Enter your room dimensions and desired natural light level to determine optimal skylight count, sizing, flashing kit requirements, and total installed cost including curb construction, waterproofing, interior finishing, and labor for Velux, Fakro, and other major brands.
Open calculatorChimney Flashing Calculator
Free chimney flashing calculator for 2026. Enter your chimney width and depth to calculate step flashing pieces, counter flashing linear feet, cricket size, ice and water shield requirements, and total material and labor cost for aluminum, galvanized steel, copper, and lead flashing installations.
Open calculatorFascia Board Calculator
Free fascia board calculator for 2026. Enter your roof perimeter and board width to calculate total linear feet of fascia, number of boards by standard lengths, corner and splice pieces, and installed cost for pine, cedar, PVC/cellular PVC, composite, and aluminum fascia wrap with labor, paint, and trim accessories.
Open calculatorSoffit Calculator
Free soffit calculator for 2026. Enter eave length and overhang depth to calculate soffit panel square footage, number of panels, J-channel linear feet, fascia board, and installed cost for vinyl, aluminum, wood, and fiber cement soffit materials with labor estimates by state.
Open calculatorIce Dam Prevention Calculator
Free ice dam prevention calculator for 2026. Enter eave length, valley count, and gutter runs to calculate self-regulating heat cable footage, ice and water shield square footage, thermostat controllers, and total installed cost for a complete ice dam prevention system with energy usage estimates.
Open calculatorRoof Permit Cost Calculator
Free roof permit cost calculator for 2026. Enter your project value, location tier, and scope of work to estimate building permit fees, plan review charges, required inspections, and total permitting timeline for re-roofing, new construction, and structural roof modification projects by jurisdiction.
Open calculatorRoofing Estimate Calculator
Free roofing estimate calculator for contractors and homeowners in 2026. Enter roof area, pitch, and material type to generate a detailed line-item project estimate with material BOM, crew labor hours, overhead, profit margin, permits, dumpster rental, and total installed price — ready for customer proposals.
Open calculatorDumpster Size Calculator for Roofing
Free dumpster size calculator for roofing projects in 2026. Enter your roof area in squares, number of shingle layers, and material type to determine the ideal roll-off dumpster size, total debris weight, haul count, and estimated rental cost — including overage charges and street permit fees for your area.
Open calculatorRoof Walkway Pad Calculator
Free roof walkway pad calculator for 2026. Enter your commercial roof dimensions, HVAC unit locations, and roof access points to determine walk pad quantity, layout configuration, adhesive needs, and total installed cost — including crossover pads for pipes and conduit, ADA-compliant path widths, and membrane-specific product recommendations.
Open calculatorRubber Roof Calculator
Free rubber roof calculator for 2026. Compare all three rubber membrane types — EPDM, TPO, and PVC — side by side for your flat or low-slope roof. Get accurate installed cost estimates, lifespan projections, energy-efficiency savings, and material quantity calculations with waste factor included. Ideal for commercial buildings, residential flat roofs, and low-slope additions.
Open calculatorShingle Removal Calculator
Free shingle removal calculator for 2026. Plan the logistics of your roof tear-off project including crew size and time estimates, debris weight calculations per layer, dumpster rental quantity, disposal facility costs, and a complete equipment and safety checklist. Built for contractors and DIY homeowners tackling asphalt shingle removal.
Open calculatorParapet Wall Calculator
Free parapet wall calculator for 2026. Enter your building perimeter and parapet dimensions to calculate coping cap material, counter-flashing, through-wall flashing, and reglet quantities. Includes material options for aluminum, steel, copper, and composite coping with installed cost estimates by state. Essential for commercial flat roof projects and parapet waterproofing.
Open calculatorRoof Warranty Value Calculator
Free roof warranty value calculator for 2026. Compare standard, enhanced, and premium warranty tiers from GAF, Owens Corning, and CertainTeed side by side. Calculate the true cost per year of warranty coverage, understand prorated vs non-prorated periods, see what is actually covered at 10, 20, and 30 years, and determine whether the enhanced warranty upcharge is worth it for your roofing project. Includes certified installer requirements and system product rules.
Open calculatorCupola Calculator
Free cupola calculator for 2026. Determine the ideal cupola base size for your barn, garage, or home using the industry 1.5-inch-per-foot ridge rule. Calculate net free area for attic ventilation, compare vinyl, wood, and copper cupola materials, and estimate total installed cost including weathervane or lightning rod options. Covers decorative and functional cupola applications with sizing tables from 24-inch to 48-inch base units.
Open calculatorRoof-to-Wall Flashing Calculator
Free roof-to-wall flashing calculator for 2026. Determine the exact number of step flashing pieces for sidewall junctions, kick flashing length for headwall transitions, material quantity for aluminum, galvanized steel, or copper flashing, plus sealant and labor costs by state. Covers both new construction and retrofit re-flashing of existing roof-to-wall intersections to prevent water intrusion.
Open calculatorPipe Boot Calculator
Free pipe boot calculator for 2026. Determine how many pipe boot flashings your roof needs based on house size and plumbing layout, select the right boot size for each pipe diameter (1.5" to 4"), compare rubber, neoprene, lead, and copper boot materials, and get installed cost estimates. Includes retrofit boot options for repairs without removing shingles and replacement scheduling for aging rubber boots.
Open calculatorRake Edge Calculator
Free rake edge calculator for 2026. Calculate exact linear feet and number of pieces for gable rake trim based on rafter length, overhang, and gable count. Compare T-style and L-style rake profiles, estimate material and labor costs by state, and account for proper overlap. Designed specifically for gable end finishing — the sloped edge detail that protects exposed roof decking.
Open calculatorScupper Drain Calculator
Free scupper drain calculator for 2026. Size primary and emergency scuppers for flat roofs with parapets using the IPC weir flow formula. Calculate scupper width, head height, flow capacity at your design rainfall intensity, and determine the number and placement of scupper openings needed. Includes conductor head sizing, downspout connections, and installed cost estimates for commercial and residential flat roof drainage systems.
Open calculatorRoof Curb Calculator
Free roof curb calculator for 2026. Size curbs for HVAC units, skylights, exhaust fans, and other rooftop equipment on flat and low-slope commercial roofs. Calculate frame lumber, metal cap flashing, rigid foam insulation, fasteners, and sealant quantities. Compare pre-fabricated versus site-built curb costs with regional labor rates for accurate budgeting on new construction and retrofit projects.
Open calculatorHeat Tape Calculator
Free gutter heat tape calculator for 2026. Calculate the exact length of self-regulating heat cable needed for your gutter runs and downspouts, including loops at connections and extensions past downspout bottoms. Determine wattage requirements, circuit sizing, thermostat options, and get complete installed cost estimates including cable, thermostat, electrician fees for a dedicated circuit, and ongoing electricity costs by state and climate zone.
Open calculatorFlashing Tape Calculator
Free flashing tape calculator for 2026. Determine the exact number of self-adhesive flashing tape rolls needed for window and door installations, seam sealing, and sheathing joints. Covers 4-inch, 6-inch, and 9-inch widths for sill pans, jamb wraps, and head flashing. Includes Grace Vycor Plus, Zip System tape, Protecto Wrap, and generic tape pricing with primer requirements and overlap allowances for a watertight building envelope.
Open calculatorRoof Edge Metal Calculator
Free roof edge metal calculator for 2026. Estimate gravel stop, fascia metal, and commercial drip edge quantities for flat and low-slope roofs by perimeter linear footage, profile height, and metal gauge. Covers 24ga galvanized, pre-finished Kynar, aluminum, and stainless steel options. Includes FM Global wind uplift edge securement requirements, 10-foot section counts, inside/outside corner pieces, and professional installation cost by state.
Open calculatorSkylight Shaft Calculator
Free skylight shaft calculator for 2026. Estimate the framing lumber, insulation, drywall, and finishing materials needed to build a light shaft from a roof-mounted skylight down through the attic space to the ceiling plane below. Covers straight shafts, splayed (angled) shafts, and flared configurations. Includes double header sizing, jack stud requirements, R-19 insulation, drywall taping, and paint for a complete shaft build beyond the skylight unit itself.
Open calculatorRoof Hatch Calculator
Free roof hatch calculator for 2026. Size roof access hatches for personnel and equipment access per OSHA requirements, select from standard sizes (30x36, 30x54, 36x36), choose insulation and safety railing options, and estimate total installed cost including the hatch unit, self-flashing curb, safety railing system, and professional installation. Covers galvanized steel, aluminum, and thermally broken hatch types for commercial and industrial buildings.
Open calculatorAttic Stairs Calculator
Free attic stairs calculator for 2026. Determine the correct pull-down attic ladder size based on your floor-to-floor height, ceiling joist spacing, and available landing space. Compare folding, telescoping, and scissor-style ladders with weight capacities from 250 to 375 lbs. Estimate rough opening framing with doubled headers and trimmers, plus total installation cost including the unit, lumber, hardware, and labor by state.
Open calculatorCommercial Roof Cost Calculator
Free commercial roof cost calculator for 2026. Estimate the complete installed cost per square foot for commercial flat roofing systems including TPO single-ply, PVC single-ply, EPDM rubber, built-up roofing (BUR), and spray polyurethane foam (SPF). Covers membrane material, rigid insulation, tapered insulation, cover board, adhesive or mechanical fasteners, tear-off of existing roof, and manufacturer warranty tiers from 10-year standard to 20-year NDL. Priced for 10,000 to 50,000 sq ft commercial buildings by state.
Open calculatorRoof Replacement Timeline Calculator
Free roof replacement timeline calculator for 2026. Plan every phase of your re-roof project from initial decision to final inspection. Estimate permit approval wait times by municipality, material ordering lead times for standard and special-order products, optimal weather windows by season and region, crew scheduling availability, and day-by-day installation milestones. Get a realistic total project duration of 3-8 weeks so you can coordinate with contractors, plan around weather, and set accurate expectations for your household.
Open calculatorRoofing Labor Hours Calculator
Free roofing labor hours calculator for 2026. Estimate crew labor hours for every phase of a roofing project including tear-off, material installation, flashing, ventilation, and gutter work. Designed for contractors building accurate bids and homeowners verifying labor estimates. Break down hours by task phase with adjustments for roof pitch, complexity, material type, and crew experience to get realistic per-square production rates for residential and light commercial roofing.
Open calculatorSpray Foam Roof Calculator
Free spray foam roof calculator for 2026. Estimate SPF roofing material quantities based on roof area, desired foam thickness, and R-value target. Compare open-cell versus closed-cell foam systems with silicone, acrylic, or elastomeric topcoats. Calculate board-feet of foam, gallons of coating, and total installed cost including labor by state. Spray foam roofing creates a seamless, self-flashing membrane with superior insulation — this calculator helps you budget the full system.
Open calculatorRoofing Square to Bundle Calculator
Free roofing square to bundle converter for 2026. Convert roofing squares to bundles, square feet to squares, and bundles to sheets for architectural shingles (3 bundles per square), 3-tab shingles (3 bundles per square), designer shingles (4-5 bundles per square), starter strip (105 LF per bundle), and ridge cap (20 LF per bundle). Includes a complete reference table for all major shingle types with coverage per bundle, pieces per bundle, and weight per square.
Open calculatorStep Flashing Calculator
Free step flashing calculator for 2026. Determine the precise number of step flashing pieces required where a sloped roof meets a vertical wall — such as dormers, sidewalls, and additions. Calculates piece count based on wall length and shingle exposure (1 piece per course), with material choices including aluminum ($0.50-$1.00/piece), galvanized steel ($0.30-$0.60/piece), and copper ($2-$5/piece). Includes sealant, roofing nail, and total installation cost estimates by state.
Open calculatorCounter Flashing Calculator
Free counter flashing calculator for 2026. Estimate the linear footage of counter (cap) flashing needed to cover step flashing at masonry wall junctions and chimneys. Includes reglet-mounted and surface-mounted options with lead ($8-$15/LF), aluminum ($3-$6/LF), copper ($12-$25/LF), and galvanized steel ($2-$4/LF) material choices. Calculates reglet grinding cost into masonry ($3-$5/LF additional), sealant requirements, and total installed labor cost by state.
Open calculatorRoof Pitch to Angle Calculator
Free roof pitch to angle converter for 2026. Instantly convert roof pitch (rise over run) to degrees, percent slope, and decimal ratio using the arctan formula. Enter any pitch from 0.5/12 to 24/12 and get the exact angle in degrees, or enter degrees to find the closest standard pitch. Includes a complete reference table with all common pitches, OSHA walkability guidelines (fall protection required above 4/12), and pitch multiplier factors for converting footprint area to actual roof area.
Open calculatorFlat Roof Ponding Calculator
Free flat roof ponding calculator for 2026. Evaluate your flat or low-slope roof for ponding water risk based on current slope, drain placement, and known low spots. Design a tapered polyiso insulation system with proper slope to drains, including cricket packages for areas between drains. Calculate tapered ISO board feet, adhesive, and labor cost by roof area and state. Covers IBC positive drainage requirements and the 48-hour ponding water standard for commercial and residential flat roofs.
Open calculatorRoof Jack Calculator
Free roof jack calculator for 2026. Determine how many adjustable roof brackets you need for safe footing on steep roofs based on your roof dimensions, pitch, and OSHA-compliant spacing requirements. Calculate scaffold plank lengths, 16d duplex nail quantities, and total equipment cost for purchase or rental. Covers OSHA requirements for worker platforms on roofs steeper than 6/12, bracket adjustment angles for pitches from 4/12 to 12/12, and the economics of buying versus renting roof jacks for DIY and contractor use.
Open calculatorRoof Soffit Ratio Calculator
Free roof soffit ratio calculator for 2026. Determine the architecturally correct overhang depth for your home based on building height, wall proportions, and architectural style — Craftsman, Colonial, Modern, Ranch, and more. Compare your current overhang to classical proportioning rules and neighborhood norms. Then verify that your rafter size can structurally support the desired cantilever without reinforcement, and check wind uplift tie-down requirements for deep overhangs in high-wind zones. Includes cost estimates for extending or modifying existing soffits.
Open calculatorGutters & Drainage
Size gutters, downspouts, gutter guards, and drainage systems.
6 calculators
Roof Drainage Calculator
Free roof drainage calculator for 2026. Enter your roof area and local rainfall intensity to calculate peak runoff volume using the Rational Method (Q=CIA), determine proper gutter profile and size, downspout count and spacing, and assess overflow risk for various storm return periods and climate zones.
Open calculatorRain Gutter Size Calculator
Free rain gutter sizing calculator for 2026. Determine the correct gutter profile (5" or 6" K-style, half-round) and downspout size for your roof based on drainage area, local rainfall intensity, roof pitch, and storm frequency. Includes downspout spacing rules, 100-year storm overflow checks, and engineering-grade capacity calculations per SMACNA standards.
Open calculatorLeaf Guard Calculator
Free leaf guard calculator for 2026. Measure your gutter runs and get exact linear footage, piece counts, corners, and end caps for gutter leaf guard installation. Compare screen guards, micro-mesh systems like LeafFilter, reverse-curve designs, and foam inserts by cost per foot, debris handling, warranty length, and maintenance requirements. Get installed cost estimates by product type and state with ROI analysis versus annual gutter cleaning.
Open calculatorBox Gutter Calculator
Free box gutter calculator for 2026. Size built-in box gutters by roof drainage area and local rainfall intensity, then estimate lining material — copper, lead-coated copper, TPO, or PVC — with soldering and labor costs. Covers minimum depth, width, slope requirements, overflow scuppers, and downspout sizing. Compare repair and reline costs by state for historic and commercial buildings with integrated gutter troughs.
Open calculatorGutter Slope Calculator
Free gutter slope calculator for 2026. Determine the correct gutter slope (pitch) for proper drainage, calculate total drop from high point to downspout, and generate a hanger height schedule for every bracket position. Covers standard 1/16-inch per foot slope, steeper options for heavy rainfall, maximum 40-foot runs between downspouts, and center-outlet configurations. Includes hanger spacing recommendations for K-style and half-round gutters with snow load adjustments.
Open calculatorGutter Downspout Placement Calculator
Free gutter downspout placement calculator for 2026. Determine the optimal number and placement of downspouts based on your roof drainage areas, gutter run lengths, local rainfall intensity, and downspout sizing. Follow engineering-based spacing rules for 2x3 and 3x4 downspouts with maximum gutter run limits. Verify flow capacity at design rainfall rates to ensure your gutter system handles storms without overflowing. Protect your foundation with properly placed downspouts at corners, low points, and high-drainage zones.
Open calculatorNeed a Cost Estimate for Your State?
Get localized roof replacement costs with labor rates, permits, and material pricing for all 50 states.
View Cost by State