Vehicle Diminished Value Calculator
Estimate how much value your vehicle lost after an accident using the industry-standard 17c Diminished Value Formula used by insurance companies.
Current market value of the vehicle before the accident (use KBB or NADA).
Damage multiplier based on structural severity (0.00–1.00).
Odometer reading at the time of the accident.
Number of years since the vehicle was manufactured.
Formula Used — Insurance Industry 17c Method
Diminished Value = (Market Value × 10%) × Damage Multiplier × Mileage Multiplier × Age Multiplier
The 17c formula is the most widely used method by insurance companies to calculate diminished value after a vehicle accident.
| Mileage | Multiplier |
|---|---|
| 0 – 19,999 mi | 1.00 |
| 20,000 – 39,999 mi | 0.80 |
| 40,000 – 59,999 mi | 0.60 |
| 60,000 – 79,999 mi | 0.40 |
| 80,000 – 99,999 mi | 0.20 |
| 100,000+ mi | 0.00 |
| Vehicle Age | Multiplier |
|---|---|
| 0 – 1 year | 1.00 |
| 2 years | 0.80 |
| 3 years | 0.60 |
| 4 years | 0.40 |
| 5 years | 0.20 |
| 6+ years | 0.00 |
Assumptions & References
- This calculator uses the 17c Diminished Value Formula, derived from the Georgia State Farm Mutual v. Mabry case (2001), which established the 10% cap on base loss of value.
- Pre-accident market value should be sourced from Kelley Blue Book (KBB) or NADA Guides.
- The 17c formula is a starting point; actual diminished value may differ based on vehicle make/model, accident history, and local market conditions.
- Vehicles older than 5 years or with 100,000+ miles typically receive a $0 diminished value under this formula, as insurers consider depreciation already significant.
- Luxury, exotic, and collector vehicles may warrant an independent appraisal beyond this formula.
- This calculator does not constitute legal or insurance advice. Consult a licensed appraiser or attorney for formal claims.
- Reference: Diminished Value of Georgia — 17c Formula Explained.