Rake Edge Calculator

Calculate rake trim linear feet, pieces, and installed cost for gable roof edges including T-style and L-style rake boards with overlap allowance

Calculate total rake linear feet from gable dimensions

Quick presets

ft

Total Linear Feet

185 LF

Ridge: 40 LF • gable roof

PRO

Professional Calculator

Extended parameters for precise calculations

sq ft

Estimated Materials

60 bundles

Roof Area

1,792 sq ft

Squares

17.9

Detailed Breakdown

Roof Area1,792 sq ft
With Waste1,971 sq ft
Roofing Squares17.9
Bundles60
How to Use This Calculator
The Rake Edge Calculator helps you determine exact linear footage, piece counts, and installed cost for the sloped trim along your roof's gable ends.

Measurement tab: Enter the number of gable ends on your home, the rafter length (measured from eave to ridge along the slope), and the rake overhang distance. The calculator computes total linear feet of rake by multiplying: gable count × 2 rake edges per gable × (rafter length + overhang). Each gable end has two sloped edges — one on the left and one on the right of the peak. The overlap allowance accounts for the 1-3 inches where adjacent pieces overlap at joints, which adds to total material needed. For example, if each 19-foot rake run requires two 10-foot pieces with a 2-inch overlap, you need 20.17 feet of material per rake run, not 19 feet.

Material tab: Choose your rake profile style — T-style is the standard for asphalt shingle roofs, L-style for metal roofs, D-style for enhanced water shedding, and wood or composite for exposed traditional trim. Select the piece length available (10-foot is standard at most suppliers) and the calculator determines how many pieces to purchase including waste. The color selector helps you estimate any upcharge for color-matched or custom finishes. Pre-finished aluminum in white or brown is the most economical choice. Color-matched options add $0.50-$1.00 per linear foot but provide a more cohesive look.

Cost tab: This tab provides a complete cost breakdown including material cost based on your selected rake style, labor cost adjusted by state, and any paint or caulk needed. Metal rake trim comes pre-finished and only needs caulk at joints. Wood rake boards need primer, paint, and caulk — add $40-$60 for a gallon of exterior trim paint that will cover 200+ linear feet. Labor costs for rake trim installation range from $3-$6 per linear foot depending on your state and the complexity of the roofline. For most standard homes, rake edge material and installation is a $400-$1,200 component of the total roofing project.

The Formula
The rake edge calculator uses these formulas:

Total Rake Linear Feet = Gable Count × 2 × (Rafter Length + Overhang in feet) Example: 2 gables × 2 sides × (18 ft + 1 ft overhang) = 76 LF

Pieces Needed = (Total LF ÷ Piece Length) rounded up, per rake run - Account for overlap: each joint adds overlap allowance to total material - Per rake run: Rafter Length + Overhang = run length - Pieces per run: ceil(run length ÷ piece length) Example: 19 ft run ÷ 10 ft piece = 2 pieces per run × 4 runs = 8 pieces

Material with Waste = Total LF × (1 + Waste Factor / 100) Example: 76 LF × 1.10 = 83.6 LF → 9 pieces at 10 ft each

Material Cost = Total LF (with waste) × Style Unit Cost - T-style: $3.00-$6.00/LF, L-style: $2.00-$4.00/LF - D-style: $4.00-$7.00/LF, Wood: $2.50-$5.00/LF - Composite/PVC: $4.00-$8.00/LF

Labor Cost = Total LF × Labor Rate per LF (by state) - Average: $3.00-$6.00/LF installed

Total Project Cost = Material + Labor + Caulk/Paint
Example Calculation
Example: Cross-Gable Colonial in New York — 4 Gable Ends, D-Style Rake

Sarah has a colonial home in Westchester, NY with 4 gable ends (front, back, and two side dormers). The main gables have 22-foot rafters and the dormers have 10-foot rafters. She wants D-style drip rake in a color-matched charcoal to complement her architectural shingles.

Step 1: Measurement
• Main gables (2): 2 gables × 2 sides × (22 ft + 0.67 ft overhang) = 90.7 LF
• Dormer gables (2): 2 gables × 2 sides × (10 ft + 0.67 ft overhang) = 42.7 LF
• Total rake linear feet: 90.7 + 42.7 = 133.4 LF

Step 2: Material Selection (D-Style, Color-Matched)
• Piece length: 10 ft sections
• Main gable runs: 22.67 ft each → 3 pieces per run × 4 runs = 12 pieces
• Dormer runs: 10.67 ft each → 2 pieces per run × 4 runs = 8 pieces
• Subtotal: 20 pieces (200 LF)
• With 10% waste: 22 pieces

Step 3: Cost Breakdown (New York)
• D-style material: 133.4 LF × $5.50/LF = $734
• Color-match upcharge: 133.4 LF × $0.75/LF = $100
• Caulk (7 joints on main, 4 on dormers = 11 joints): 2 tubes × $7 = $14
• Labor (NY rate): 133.4 LF × $5.00/LF = $667
• Ridge peak caps (4 gables): 4 × $12 = $48
• Total installed: ~$1,563 ($11.72/LF)

The rake trim is a relatively small but visible component — for Sarah's home it represents about 5-7% of the total re-roofing cost but has outsized impact on curb appeal from the gable view.

Frequently Asked Questions

What is the difference between a rake edge and a drip edge on a roof?
A rake edge is the sloped trim that runs along the gable end of a roof — the angled edge where the roof slope meets the gable wall. A drip edge is the metal flashing installed along the eaves (the horizontal bottom edge of the roof) to direct water into the gutters. While drip edge runs horizontally, rake trim runs on a slope. Many roofers use the term "drip edge" to refer to both eave and rake metal, but they are technically different components with different profiles. The rake edge must cover the exposed edge of the roof decking on the gable side, prevent wind-driven rain from getting under the shingles, and provide a finished appearance. On many homes, the rake edge and drip edge are the same material and color, just installed in different locations.
How many pieces of rake trim do I need for a standard home?
For a standard gable roof home with two gable ends and 18-foot rafters plus 1 foot of overhang, you need approximately 76 linear feet of rake trim. Each gable has two sloped edges, so 2 gables × 2 sides × 19 feet = 76 linear feet. Using 10-foot sections with 2 inches of overlap at each joint, you need 8 pieces (each rafter length requires 2 pieces — one from the eave to mid-slope and one from mid-slope to the ridge). Adding 10% waste for cuts at the ridge peak and any damage during handling, plan on purchasing 9 pieces. At $4-$6 per linear foot for T-style rake, the material cost for 90 linear feet of rake is approximately $360-$540.
What is T-style rake trim and when should I use it?
T-style rake trim has a cross-section shaped like the letter T when viewed from the end. The horizontal part of the T slides under the shingle edge on top of the roof, while the vertical part hangs down to cover the exposed fascia or decking at the gable end. This creates a clean, finished look that both protects against water infiltration and prevents wind uplift at the shingle edges. T-style rake is the standard choice for asphalt shingle roofs and is stocked at virtually every roofing supply house in white, brown, and black. It typically costs $3-$6 per linear foot for aluminum or galvanized steel. Use T-style rake whenever you have standard asphalt shingles — it is specifically designed to interface with the shingle edge at the gable.
Do I need to caulk or seal rake edge joints?
Yes, you should caulk every joint where two pieces of rake trim overlap. The overlap itself (typically 2 inches) prevents most water penetration, but a bead of high-quality exterior caulk or roofing sealant at each joint provides a watertight seal. Use polyurethane or tripolymer sealant rated for exterior and roofing use — silicone caulk does not adhere well to painted metal surfaces. Apply a thin bead inside the overlap before pressing the pieces together, and run a small bead along the top seam after assembly. For a standard home with 8-10 rake pieces, you will need 1-2 tubes of caulk ($5-$8 each). Also apply caulk where the rake trim meets the ridge cap at the peak and where it terminates at the eave.
Can I install rake edge trim myself or do I need a roofer?
Rake edge installation is a moderately difficult DIY project that requires working on a ladder along the gable edge of the roof. If you are comfortable on a ladder at roof height and have basic tools (tin snips, drill, pop rivet gun or roofing nails), you can install metal rake trim yourself. The process involves cutting pieces to length with tin snips, nailing or screwing them to the fascia board or roof deck edge every 12-16 inches, overlapping joints by 2 inches in the direction of water flow (top piece overlaps bottom), and caulking all joints. The most challenging part is cutting the angle at the ridge peak where two rake pieces meet — use a scrap piece as a template first. Wood rake boards require a miter saw for the ridge cut. Professional labor runs $3-$6 per linear foot for installation, so for a typical 76 LF job you would save $228-$456 by doing it yourself.

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