Diminished Value Calculator

Free Diminished Value Calculator for Car Accident Claims

Estimate how much resale value your car may have lost after an accident. Then use that number as the starting point for a lawyer-backed diminished value review.

Written by Elliot Singer, Esq.·Attorney-reviewed by Conduit Law·Updated June 2026

The short version

✓The calculator uses a common 17c-style formula: 10% of pre-loss value × mileage modifier × damage modifier.
✓A calculator result is not a final appraisal, settlement prediction, or legal advice.
✓The best diminished value claims use the estimate as a starting point, then support the demand with market evidence.
✓Property Damage King reviews diminished value claims through Conduit Law, licensed in Colorado, California, Arizona, and Kansas.

Informational estimate only — not legal advice, a valuation, or a promise of recovery. Talk to an attorney for a real case value.

Free 17c calculator

Estimate your car's diminished value after an accident.

This uses the common 17c-style starting formula: 10% of pre-loss value, adjusted for mileage and damage severity. It is a screening estimate, not a legal valuation or guarantee.

Pre-accident market value

Mileage at the time of loss

Damage severity

VIN (optional — auto-fills your vehicle)

I understand this is an informational estimate only. It is not legal advice, not a case valuation, and not a promise of any settlement or recovery. Real claim values depend on facts, evidence, and insurance that only an attorney can evaluate. The only way to learn what my claim may actually be worth is to speak with a lawyer.

Estimated diminished value

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Enter your vehicle value, mileage, and damage severity to see the estimate.

10% starting cap$3,000

Mileage modifier0.6×

Damage modifier0.50×

Want the full intake instead? Start the claim qualifier →

How this diminished value calculator works

This tool uses the common 17c formula structure. It starts with a base cap equal to 10% of the car's pre-accident value. It then reduces that number based on mileage and the severity of the damage. For example, a $30,000 vehicle starts with a $3,000 base cap before modifiers.

The inputs matter. A low-mileage, newer vehicle with significant structural damage usually screens higher than an older high-mileage vehicle with cosmetic damage. That does not mean either claim is guaranteed — it only tells you whether the number may be worth a closer look.

Why a calculator is only a starting point

Insurance companies like formulas because formulas are fast and predictable. Real market loss is messier. Buyers compare accident-history vehicles against clean-history vehicles, dealers discount for reported damage, and the impact can vary by make, model, trim, mileage, repair quality, and local market.

That is why a strong diminished value claim should not stop at the calculator. The next step is a documented valuation: repair records, accident history, photos, comparable vehicles, and a written demand that explains why the insurer's number is too low.

What to do after you estimate diminished value

Save the calculator result and gather the repair estimate, final invoice, photos, and the insurer's written position.
Confirm fault. Diminished value is usually strongest when the other driver caused the crash.
Do not sign a release that gives up property-damage claims until you understand what it covers.
Get a lawyer-backed review before treating the insurer's 17c number as final.

Diminished value calculator FAQ

How do you calculate diminished value after an accident?+

A common insurer starting point is the 17c formula: begin with 10% of the vehicle's pre-loss value, then multiply that number by mileage and damage-severity factors. That produces a screening estimate, but a real claim should be supported by market data and comparable vehicles.

Is the 17c diminished value formula accurate?+

Not always. The 17c formula is easy to run, but its 10% cap and fixed modifiers can understate the actual market loss, especially for newer, higher-value, or specialty vehicles. Treat it as a starting point, not the final claim value.

Can I claim diminished value if my car was repaired?+

Yes, if the accident history leaves the repaired vehicle worth less than a comparable clean-title vehicle. Diminished value is about lost resale value after repairs, not just the cost of fixing the vehicle.

Do I need an appraisal for diminished value?+

You can start without one, but insurers usually respond better to a documented, comparable-vehicle valuation than to a bare calculator result. The stronger path is to use the calculator to screen the claim, then support the demand with evidence.

Keep building your diminished value claim

About the author

This guide is written by Elliot Singer, Esq., founder of Conduit Law and the attorney behind Property Damage King. PDK focuses on practical, document-backed insurance-claim reviews for diminished value, total loss, and related auto property-damage disputes.

Property Damage King is a DBA of Conduit Law. This page is attorney advertising and is provided for general educational purposes only — it is not legal advice and does not create an attorney-client relationship. Insurance and claim rules vary by state and by policy; for guidance on your specific situation, talk to an attorney. Settlement examples are real past results provided for illustration and are not a prediction or guarantee of the outcome of any future claim.