Storm Damage Insurance Claim Estimator

Estimate your expected insurance claim payout after storm damage by entering your repair costs, policy details, and depreciation information.

Minimum coverage required as % of property value (typically 80%)
The amount your property is currently insured for
Current full replacement cost of the property

Formulas Used

1. Straight-Line Depreciation Rate:
Annual Depreciation Rate = 1 ÷ Useful Life (years)
Total Depreciation % = Annual Rate × Item Age (capped at 90%)
Depreciation Amount = Repair Cost × Total Depreciation %
ACV = Repair Cost − Depreciation Amount

2. Coinsurance Ratio:
Required Insurance = Property Replacement Value × (Coinsurance % ÷ 100)
Coinsurance Ratio = Insured Value ÷ Required Insurance (max 1.0)

3. Covered Loss:
Base Loss = Repair Cost (RCV) or ACV (ACV policy)
Covered Loss = Base Loss × Coinsurance Ratio

4. Estimated Payout:
After Deductible = max(Covered Loss − Deductible, 0)
Estimated Payout = min(After Deductible, Coverage Limit)
Out-of-Pocket = Repair Cost − Estimated Payout

Assumptions & References

  • Depreciation is calculated using the straight-line method, the most common approach used by insurers for ACV claims (Insurance Information Institute).
  • Depreciation is capped at 90% of repair cost — most insurers retain a minimum residual value.
  • RCV policies pay the full cost to repair or replace damaged property with like kind and quality, without deducting depreciation.
  • ACV policies pay the depreciated value of the damaged property at the time of loss.
  • The coinsurance clause (typically 80%) requires homeowners to insure their property to a minimum percentage of its replacement value. Failure to do so results in a proportional reduction in claim payment (ISO HO-3 policy form).
  • This estimator does not account for storm-specific deductibles (e.g., hurricane or wind/hail deductibles), which may be a percentage of insured value rather than a flat dollar amount.
  • Additional living expenses (ALE), contents coverage, and code upgrade costs are not included in this estimate.
  • Results are estimates only. Actual claim amounts are determined by your insurer's adjuster and policy terms.
  • References: Insurance Information Institute (iii.org), NAIC Consumer Guide to Homeowners Insurance, ISO HO-3 Policy Form.

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