Hail Damage Calculator

Estimate hail damage severity, repair vs replacement cost, and insurance claim value for your roof

Estimate damage severity from hail size and roof condition

Quick presets

Estimated Claim

$5,324

After $1,000 deductible

PRO

Professional Calculator

Calculate insurance claim payout with depreciation and deductible

sq ft
years
$
50%

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 Hail Damage Calculator helps homeowners assess storm damage and understand their insurance claim before calling a contractor or adjuster.

Damage Assessment tab: Select the hail size reported in your area, your roofing material, roof age, and total roof area. The calculator estimates the percentage of your roof that likely sustained functional damage based on published impact-resistance data and industry damage matrices. This gives you a baseline to compare against the adjuster's findings. Keep in mind that only an on-roof inspection can confirm actual damage.

Repair vs Replace tab: Enter the estimated damage percentage (from the assessment tab or a professional inspection) along with your roof details. The calculator compares the cost of a partial repair against full replacement, factoring in color-match availability, the industry-standard threshold for replacement (typically 25-30% damage), and the remaining useful life of your existing roof. Often, even moderate damage makes full replacement the smarter financial choice.

Insurance Estimate tab: Enter your full replacement cost, deductible, and policy type (RCV or ACV). The calculator shows your expected insurance payout, out-of-pocket cost, and recoverable depreciation. For ACV policies, it calculates the depreciation deduction based on roof age. This helps you understand what to expect from your insurance company and plan your finances accordingly.

The Formula
The hail damage calculator uses these models:

Damage Percentage Estimate Base damage % is determined by hail size and material vulnerability: - 3-tab shingles: ~10% damage at 1", ~50% at 1.5", ~90% at 2"+ - Architectural shingles: ~5% at 1", ~35% at 1.5", ~80% at 2"+ - Class 4 (impact-resistant): ~0% at 1", ~5% at 1.5", ~25% at 2"+ Age modifier: damage% × (1 + roofAge × 0.02) (older roofs take more damage) Slope factor: only affected slopes contribute proportionally

Repair Cost = Damaged Area × Per-Square Repair Rate × 1.3 (repair premium) Replacement Cost = Total Roof Area × Per-Square Installed Rate

Insurance Payout (RCV) = Replacement Cost - Deductible Insurance Payout (ACV) = Replacement Cost × (1 - Age × Depreciation Rate) - Deductible Out-of-Pocket (RCV) = Deductible only (depreciation is recoverable) Out-of-Pocket (ACV) = Deductible + (Replacement Cost × Age × Depreciation Rate)
Example Calculation
Example: Hail Damage Claim in Dallas, TX

The Ramirez family in Dallas experienced a storm with 1.75" (golf ball) hail. Their home has a 2,000 sq ft architectural shingle roof that is 8 years old.

Step 1: Damage Assessment
• Hail size: 1.75" on architectural shingles
• Base damage: ~60% (golf-ball hail on standard architectural)
• Age modifier: 60% × (1 + 8 × 0.02) = 60% × 1.16 = 70% damaged
• All slopes affected (multi-directional storm)
• Damaged area: 2,000 × 0.70 = 1,400 sq ft

Step 2: Repair vs Replace
• Partial repair (1,400 sq ft): 14 squares × $550/sq × 1.3 repair premium = $10,010
• Full replacement (2,000 sq ft): 20 squares × $550/sq = $11,000
• Color match: not available (shingle discontinued 3 years ago)
• Recommendation: Full replacement (repair costs 91% of replacement, and no color match)

Step 3: Insurance Estimate
• Policy: RCV (replacement cost value)
• Full replacement cost: $11,000
• Deductible: $2,500 (flat)
• Insurance initial payment: $11,000 - $2,500 - depreciation hold = $5,300 - Depreciation hold: $11,000 × 8 years × 3.3% = $2,904 - Recoverable after repair completion: $2,904
• Total insurance pays: $8,500 (after recovery)
• Out-of-pocket: $2,500 (deductible only)

Frequently Asked Questions

What size hail causes roof damage?
Hail as small as 1 inch (quarter-sized) can damage asphalt shingles by dislodging granules and creating soft spots. At 1.5 inches (walnut-sized), most asphalt shingles sustain functional damage including cracked mats and exposed fiberglass. At 2 inches and above, damage is almost certain to all roof types except impact-resistant (Class 4) materials. Even metal roofs can be cosmetically dented by hail over 1.5 inches.
Should I repair or replace my roof after hail damage?
If damage affects less than 25% of the roof, repairs may be sufficient — but only if replacement shingles are an exact color match. If damage exceeds 25-30% of the roof area, most insurance companies and roofing professionals recommend full replacement. If matching shingles are unavailable (common for roofs over 5 years old), insurance typically approves full replacement to maintain uniform appearance.
How does roof age affect a hail damage insurance claim?
Roof age matters in two ways. First, older shingles are more brittle and sustain more damage from the same hail impact. Second, if your policy uses Actual Cash Value (ACV) rather than Replacement Cost Value (RCV), your payout is reduced by depreciation. A 10-year-old roof at 5% annual depreciation loses 50% of its value, meaning you could owe thousands out of pocket. Many policies written since 2020 automatically switch to ACV for roofs over 10-15 years old.
What is the difference between RCV and ACV for roof claims?
Replacement Cost Value (RCV) pays the full cost to replace your roof with equivalent materials, minus your deductible. You receive the depreciated amount upfront and the remainder (recoverable depreciation) after repairs are completed. Actual Cash Value (ACV) only pays the depreciated value — you never recover the depreciation. For a $14,000 replacement on a 10-year-old roof at 5%/year: RCV pays $14,000 - deductible; ACV pays only $7,000 - deductible.
Do I need a roof inspection after a hail storm?
Yes. You should get a professional roof inspection within 30 days of any hail event with stones 1 inch or larger. Many types of hail damage are not visible from the ground — soft spots, granule loss, and hairline mat cracks require close-up inspection. Most reputable roofing contractors offer free hail damage inspections. File your insurance claim promptly, as most policies require notice within 1 year of the damage event, and some states have even shorter deadlines.

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