Rex says
Money math without the spreadsheet headache. Plug in your numbers and I'll show you exactly where the dollars land.
Try a scenario
Click to load — tweak from there.Inputs
Result
Your dollar deductible
$75,000
Your total out-of-pocket on this scenario
$75,000
Insurer payout on this scenario
$75,000
Years of premium equal to deductible
62.5
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How to use this
- 1Enter dwelling coverage amount ($).
- 2Enter deductible percentage (%).
- 3Enter estimated damage scenario ($).
- 4Enter annual premium at this deductible ($).
- 5Read your your dollar deductible on the right — it updates as you type.
- 6Hit Share to keep the scenario or send it to someone.
About this calculator
Earthquake insurance deductibles work differently from most other insurance: instead of a flat dollar amount, they're typically 5%, 10%, 15%, or 20% of your dwelling's insured value, not of the claim size. That structure catches people off guard — a $500,000 home with a 15% deductible means you pay the first $75,000 of any earthquake damage yourself, regardless of whether the loss is $80,000 or $400,000. This calculator converts your deductible percentage into a real dollar figure, applies it against an estimated damage scenario, and shows what the insurer actually pays versus what comes out of your pocket, so you can weight the deductible tradeoff against the premium savings a higher percentage typically buys.
Worked example
Using the values the calculator loads with:
Inputs
- Dwelling coverage amount: 500000 $
- Deductible percentage: 15 %
- Estimated damage scenario: 150000 $
- Annual premium at this deductible: 1200 $
Results
- Your dollar deductible: $75,000
- Your total out-of-pocket on this scenario: $75,000
- Insurer payout on this scenario: $75,000
- Years of premium equal to deductible: 62.5
What each field means
Inputs
- Dwelling coverage amount ($)
- The dwelling coverage amount used in the calculation, measured in $. Starts at 500000 $ so you have a working example on load.
- Deductible percentage (%)
- The deductible percentage used in the calculation, measured in %. Starts at 15 % so you have a working example on load. Accepted range: 5–25 %.
- Estimated damage scenario ($)
- The estimated damage scenario used in the calculation, measured in $. Starts at 150000 $ so you have a working example on load.
- Annual premium at this deductible ($)
- The annual premium at this deductible used in the calculation, measured in $. Starts at 1200 $ so you have a working example on load.
Results
- Your dollar deductible
- Returned as a money amount in US dollars and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Your total out-of-pocket on this scenario
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Insurer payout on this scenario
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Years of premium equal to deductible
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
Why is the earthquake deductible based on coverage value, not the claim amount?
Insurers use a percentage-of-coverage deductible because earthquake losses are catastrophic and correlated — many policyholders file at once after a major quake, so insurers need a predictable, large self-retention per policyholder rather than a small flat amount. It also discourages small claims for cosmetic cracking, keeping the pool focused on structural damage.
Does a higher deductible always save money?
Generally yes on premium, often meaningfully — moving from 10% to 20% can cut premium 20-40% depending on the insurer and region. But run the math on your actual savings capacity: if a 20% deductible on a $500k home means $100,000 out of pocket and you don't have that liquid, the premium savings isn't worth the exposure.
Does earthquake insurance cover contents and loss of use separately?
Yes, most policies have separate deductibles or sub-limits for contents (personal property) and additional living expenses if your home is uninhabitable, often not subject to the same large percentage deductible as the dwelling. Read your policy's declarations page carefully since contents deductibles are sometimes a flat dollar amount instead.
Is earthquake insurance required by mortgage lenders?
No, standard mortgage requirements only mandate flood insurance in designated flood zones, not earthquake coverage, since earthquake risk isn't federally mapped the same way. It's entirely optional even in high-seismic states like California, which is why take-up rates in California hover around 10-15% of homeowners despite significant fault exposure.
Accuracy and limitations
- Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
- Rates are treated as fixed for the whole period — variable-rate products will drift from this projection.
- This is educational maths, not financial advice. Check anything contractual with the lender or your accountant.
Related tools
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Earthquake Insurance Deductible Cost Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/earthquake-deductible-cost
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/earthquake-deductible-cost" target="_blank" rel="noopener">Earthquake Insurance Deductible Cost Calculator — RevenueLab</a> (2026).</p>
Source: [Earthquake Insurance Deductible Cost Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/earthquake-deductible-cost) (2026).