Diminished Value Calculator
After a car accident, your vehicle loses resale value — even after repairs. Insurance companies use restrictive formulas like the 17c rule to lowball your car accident diminished value claim. Enter your vehicle's details to see what they'll offer, versus what your car's value loss is actually worth.
Diminished Value Estimator
See what the insurance company's formula says your claim is worth.
Disclaimer: This calculator provides a rough estimate based on the insurance industry's standard 17c formula. It is not a certified appraisal and does not guarantee settlement amounts. Only a licensed auto appraiser can determine actual diminished value through a certified market analysis.
Why Your Car Is Worth Less, Even After It's Fixed
Most people are surprised to learn this: once your car has been in an accident, its resale value drops permanently — even if repairs are flawless. The moment that crash shows up on your Carfax or AutoCheck report, dealerships and private buyers will offer you less. That's just how the used car market works.
Insurance companies know this, but they use a formula called the 17c rule to calculate your car's loss in value in a way that protects their bottom line — not yours. It caps your payout at 10% of your car's value, then applies mileage penalties that can shrink your check to almost nothing.
At DVHIVE, our licensed independent appraisers look at what comparable cars are actually selling for in your local market — with and without accident histories — to show exactly how much value your car lost. That's the number you're legally owed. That's the number we fight for.
How to Calculate Diminished Value
You don't need special software to understand how diminished value is calculated. The real-market method comes down to four steps — and it's exactly how our certified appraisers build a claim that holds up against an insurer's 17c formula.
- 1
Find your car's pre-accident market value
Start with the fair market value your vehicle had right before the accident — what a comparable, clean-history example of your year, make, model and mileage was selling for.
- 2
Determine the post-repair market value
Establish what the same vehicle is worth now that an accident appears on its Carfax or AutoCheck history, even after flawless repairs. Buyers and dealers pay less for a car with a reported accident.
- 3
Subtract to find the diminished value
The difference between the pre-accident value and the post-repair value is your inherent diminished value — the money you lost purely because of the accident history.
- 4
Compare against the insurer's 17c number
Run the same vehicle through the 17c formula to see how far the insurance company's capped offer falls below the real market loss, then use a certified appraisal to recover the difference.
Diminished Value Calculator FAQ
Is the diminished value calculator free?
Yes. The DVHIVE diminished value calculator is completely free and requires no email or sign-up to see your estimate. It gives you an instant, comparable-sale-based estimate of your vehicle's post-repair loss of value in about 60 seconds.
How do you calculate diminished value?
Diminished value is calculated by comparing your vehicle's fair market value before the accident to its market value afterward — with the accident now on its Carfax or AutoCheck history. The real-market method looks at what comparable vehicles with and without accident histories actually sell for. Insurers instead use the 17c formula, which starts from just 10% of your car's value and then subtracts mileage and damage penalties, almost always producing a lower number than the market supports.
What is the 17c formula and why is it a lowball?
The 17c formula comes from the Georgia case State Farm v. Mabry. It caps diminished value at 10% of your vehicle's pre-accident value (the 'base loss'), then multiplies that cap down further using a damage-severity modifier and a mileage modifier. Because it starts from an arbitrary 10% ceiling rather than actual resale data, the 17c formula routinely understates what buyers really deduct for an accident history. Our appraisals use market comparables instead, which is why they typically come in significantly higher.
How accurate is it compared to the insurance company's 17c formula?
Insurers often use the 17c formula, which caps your payout at 10% of your car's value and then applies mileage and damage penalties that shrink the number further. Our calculator instead estimates loss the way the real market behaves — using what comparable vehicles with and without accident histories actually sell for — so it typically reflects a far more accurate, and higher, figure than the 17c shortcut.
What information do I need to use the calculator?
You only need a few basic details: your vehicle's year, make, model, mileage, and a general sense of the damage severity. The calculator uses those inputs against comparable-sale market data to estimate your diminished value — no VIN, no personal information, and no email required to see the result.
What is the difference between the calculator and a certified appraisal?
The calculator gives you a fast, free ballpark of what your diminished value claim may be worth. A certified diminished value appraisal is a court-admissible, insurer-accepted report prepared by a licensed appraiser with full market analysis and a demand letter — the document you actually submit to recover your money. The calculator is the starting point; the appraisal is what wins the claim.
Turn Your Estimate Into a Paid Claim
The calculator gives you the number. A certified diminished value appraisal turns it into an insurer-accepted claim. Was your car declared a total loss, or did the airbags deploy? See our total loss appraisal service instead. Review pricing or start your free estimate in under 60 seconds.
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