The 17c formula: the lowball, dressed up as math
The “17c” formula is the calculation most insurers use to value diminished value claims. It caps your loss at 10% of your car's value, then shrinks it further with a mileage table. It is not the law — it's one insurer's formula the whole industry copied because it pays you less.
See your honest number vs. 17c
The calculator shows both side by side so you can see exactly what the formula is suppressing.
Where 17c came from
The formula traces back to a Georgia class-action settlement involving State Farm in 2001 (the Mabry case), where a method was adopted to estimate diminished value at scale. Insurers across the country then embraced that capped method — “17c” — as a convenient way to standardize payouts downward. Convenient for them, not for you.
How the formula works
- Start with a 10% cap. The formula begins by assuming your maximum possible loss is just 10% of the car's value — no matter what the market actually says.
- Apply a damage multiplier. A factor (often 0.00–1.00) scales that capped number down based on damage severity.
- Apply a mileage multiplier. A second factor cuts it again as mileage rises — dropping toward near-zero for higher-mileage cars.
Each step only ever shrinks the number. There is no step that checks what your car would actually sell for.
A worked example
| Car's pre-accident value | $24,000 |
| × 10% cap | $2,400 |
| × 0.50 damage factor (moderate) | $1,200 |
| × 0.60 mileage factor (~45k mi) | $720 |
| Honest market estimate | ~$3,120 |
Same car, same accident: the 17c formula offers about $720, while the market says the real loss is closer to $3,120. That roughly $2,400 gap is what the cap quietly removes.
How to beat it
You don't have to accept the 17c number. The counter is evidence: a market-based appraisal and comparable listings for your exact vehicle (clean-history vs. accident-history). When you can show what your car actually sells for, the formula stops being the conversation.
Frequently asked questions
What is the 17c formula?
The 17c formula is a calculation many insurers use to estimate diminished value. It multiplies your car's value by a 10% cap, then by a damage factor and a mileage factor. The result is almost always far below the real market loss.
Is the 17c formula required by law?
No. 17c is not a law and no state requires you to accept it. It originated from a single insurer's settlement formula and was adopted across the industry because it limits payouts — not because it reflects market reality.
Do I have to accept the insurer's 17c number?
No. You can counter with a market-based appraisal and comparable resale listings for your exact vehicle. Documented evidence of the real price gap is what supports a higher demand.
RecoupPro provides self-help information and document tools, not legal advice. We are not a law firm and don't provide legal representation, and using this site does not create an attorney-client relationship. For advice about your own situation, consult a licensed attorney.