Diminished Value Calculator
A repaired car is still worth less than one that was never wrecked. This calculator runs the insurer’s 17c formula and shows the realistic market loss beside it — so you walk into a diminished value claim knowing both the lowball number and the figure worth fighting for.
Clean retail value the day before the crash (KBB / NADA).
Higher mileage lowers the 17c mileage multiplier.
What Is Diminished Value?
Diminished value is the difference between what your car was worth before an accident and what it’s worth after — even once it’s been perfectly repaired. Two identical cars on a lot will sell for different prices if one has a recorded accident and the other doesn’t. Buyers pay less for the wrecked one, and that price gap is money out of your pocket the day you sell or trade.
There are three flavors worth knowing. Inherent diminished value is the loss from the car simply having an accident on record — this is what most claims and this calculator target. Repair-related diminished value is extra loss from imperfect repairs (mismatched paint, panel gaps). Immediate diminished value is the difference right after the crash, before repairs. The 17c formula estimates inherent diminished value.
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How the 17c Formula Works
The “17c” name comes from paragraph 17(c) of the Georgia class-action settlement Mabry v. State Farm. It became the de-facto method insurers reach for, because it produces a conservative number. Here’s every step it runs:
Pre-accident value
Start from the clean retail value the day before the crash — KBB or NADA for your exact year, trim, and mileage.
10% base cap
The 17c formula caps maximum base loss at 10% of that value. This is the single biggest reason 17c under-states real loss.
Damage multiplier
Severity scales the base from 1.00 (structural) down to 0.00 (no structural damage). Frame damage carries the worst stigma.
Mileage multiplier
A second reduction by odometer band, from 1.00 under 20k miles to 0.00 at 100k+. Two stacked reductions shrink the figure fast.
Why insurers love it:stacking a 10% cap with two multipliers that each only reduce the number means 17c rarely reflects what the car actually lost. It’s a starting point to negotiate against — not a ceiling.
Typical Market Loss by Damage Severity
Real-world resale discounts as a percentage of pre-accident value. Use these as a sanity check against the 17c figure when building a claim.
| Damage | Value Lost | Examples |
|---|---|---|
| Minor cosmetic | 5–10% | Scratches, dents, bumper scuffs |
| Moderate repairable | 10–15% | Standard collision, bolt-on parts |
| Major bodywork | 15–20% | Panel/suspension replacement |
| Structural / frame | 20–25% | Unibody, frame, airbag deployment |
| Branded title (after) | 30–50% | Salvage or rebuilt brand recorded |
How to File a Diminished Value Claim
- Confirm you can claim — Third-party claims (against the at-fault driver's insurer when you weren't at fault) are widely allowed. First-party claims against your own insurer are barred or limited in many states — check yours.
- Gather your evidence — Pull the repair invoice, photos of the damage, the police report, and the pre-accident value from KBB or NADA. The accident record on the VIN shows what future buyers will see.
- Get an independent appraisal — For any meaningful claim, a licensed appraiser's written report carries far more weight than a self-calculated figure and is often required to recover the real market loss.
- Submit a written demand — Send the insurer a demand letter with your appraisal and supporting documents, stating the market-loss figure — not the 17c number — as your claim amount.
- Negotiate, then escalate — Expect a low first offer near the 17c figure. Counter with your appraisal. If they won't move, options include your state insurance department, arbitration, or small-claims court.
Accident History Check
See the record buyers will find
Market Value
Current valuation by VIN
Depreciation Calculator
Value loss over time
Frequently Asked Questions
- What is diminished value?
- The loss in a car's market worth after an accident, even once it's perfectly repaired. An identical car with no accident history sells for more — that price gap is the diminished value.
- What is the 17c formula?
- The method most insurers use, from Mabry v. State Farm. It caps base loss at 10% of pre-accident value, then multiplies by a damage multiplier and a mileage multiplier — producing a deliberately conservative number.
- Is the 17c number what I'll actually recover?
- It's the insurer's opening figure, usually a lowball. Real market loss is typically higher — 10–25% of value for structural damage. An independent appraisal is how you argue for the difference.
- Can I claim diminished value against my own insurance?
- Often no — first-party DV claims are barred or limited in many states. Third-party claims against the at-fault driver's insurer are widely available when you weren't at fault.
- Do I need an appraisal?
- For anything beyond a small claim, yes. A licensed appraiser's written report is taken far more seriously than a self-calculated figure and is often required to recover the full loss.
- How long do I have to file?
- Your state's property-damage statute of limitations applies — commonly two to four years from the accident. File early, while records and pre-accident value are fresh.
Related VIN Checks
More tools to verify any vehicle's history
Building a Diminished Value Claim?
Pull the accident record tied to your VIN — the same record a future buyer will see, and the evidence that proves your car’s value took a hit.
Check Accident History