Your car was repaired properly and looks fine. It's still worth less than it was, because the accident now sits on its history report and every future buyer will see it. Diminished value is that loss, and a diminished value claim is the attempt to recover it.
Plenty of sites will hand you a 17c calculator and a number. Far fewer tell you that most people asking the question aren't eligible to claim at all, or that the number the formula produces is often smaller than the appraisal needed to support it.
Quick answer: You generally can only recover diminished value from the at-fault driver's insurer, not your own — most policies exclude it on first-party claims. If you were at fault, your car was totaled, or the damage never got reported, there's usually nothing to claim. If you clear those gates, the 17c formula caps the payout at 10% of pre-accident value and cuts it hard for mileage, so a high-mileage car often produces a claim worth less than the $300–$400 appraisal that would support it.
Work through these before touching any calculator. Failing any one usually ends the matter.
State law also varies on whether diminished value is recoverable at all and on what evidence is required. A few states are openly hostile to these claims; others accept them routinely.
Most insurers reach for the 17c formula, which came out of that same Georgia case. It runs in three steps:
On a $28,000 vehicle, that produces:
| Damage Level | 15,000 miles | 45,000 miles | 85,000 miles |
|---|---|---|---|
| Severe structural | $2,800 | $1,680 | $560 |
| Major | $2,100 | $1,260 | $420 |
| Moderate | $1,400 | $840 | $280 |
| Minor | $700 | $420 | $140 |
Two things jump out. The mileage multiplier does most of the damage — the same severe-structural claim drops from $2,800 to $560 purely on the odometer. And the 10% cap means a catastrophically damaged $28,000 car can never produce more than $2,800 under this method, even though real-world buyers would discount it far more.
The 17c formula is not law. It's an insurer convention that produces a low, consistent number, and it double-counts mileage — the pre-accident value already reflects the odometer, then the formula penalises it again. Courts in several states have questioned it, particularly for luxury and low-production vehicles where actual market losses run well past 10%.
Treat the 17c output as the insurer's opening position. A market-based appraisal, or documented dealer trade-in differentials on your specific car with and without the accident history, is what moves a settlement above it.
If the insurer is calling it a total loss, the settlement math is different — and so are your options.
Totaled Car Settlement Calculator →An independent appraisal to document your loss typically costs $300–$400. Insurers generally won't take an unsupported number seriously, so that cost is close to mandatory on any contested claim. Against the table above:
| Scenario ($28,000 car) | 17c Estimate | Less $350 Appraisal | Worth Pursuing? |
|---|---|---|---|
| Major damage, 15,000 mi | $2,100 | $1,750 | Yes, clearly |
| Moderate damage, 45,000 mi | $840 | $490 | Probably |
| Moderate damage, 85,000 mi | $280 | Negative | No |
| Minor damage, 85,000 mi | $140 | Negative | No |
The pattern is consistent: diminished value claims are worth filing on newer, lower-mileage cars with structural damage, and rarely worth it otherwise. If your car is past 80,000 miles or the damage was cosmetic, the claim likely costs more to prove than it returns — and that's before your time.
Below roughly $500 of estimated loss, it's usually worth filing informally without an appraisal: submit your own comparables and see whether the adjuster settles. You lose nothing but time.
Be wary of firms that offer to handle the claim for a percentage. On a $1,000 claim, a 35% contingency plus fees can leave you with less than filing it yourself.
Diminished value rules, formulas, and filing deadlines differ significantly by state and by policy. Confirm your specific situation with your state's insurance department or a licensed appraiser before relying on these figures.