Diminished Value Calculator
Estimate how much value your vehicle lost after an accident and repair using the industry-standard 17c formula.
Formula — GEICO 17c Method
The 17c formula is the most widely used method for calculating diminished value in insurance claims:
- Base Loss of Value = Pre-Accident Market Value × 10%
- After Damage Multiplier = Base Loss × Damage Severity Multiplier
- Diminished Value = Step 2 Result × Mileage Multiplier
Damage Severity Multipliers:
- 1.00 — Severe structural damage
- 0.75 — Major damage to structure & body panels
- 0.50 — Moderate damage to structure & body panels
- 0.25 — Minor damage to structure & body panels
- 0.00 — No structural damage / superficial scratches
Mileage Multipliers:
- 1.00 — 0–19,999 miles
- 0.80 — 20,000–39,999 miles
- 0.60 — 40,000–59,999 miles
- 0.40 — 60,000–79,999 miles
- 0.20 — 80,000–99,999 miles
- 0.00 — 100,000+ miles
Assumptions & References
- This calculator uses the 17c formula, originally developed by State Farm and widely adopted by insurers including GEICO.
- Pre-accident market value should reflect the vehicle's fair market value immediately before the accident (use Kelley Blue Book, NADA, or a professional appraisal).
- The 10% cap on base loss of value is a built-in limitation of the 17c formula and is often criticized for undervaluing claims on high-value vehicles.
- Diminished value claims are generally only applicable when the accident was caused by another party (not-at-fault claims).
- Some states (e.g., Georgia) have stronger consumer protections for diminished value claims; others may limit or exclude them.
- This estimate is for informational purposes only. For legal claims, consult a licensed appraiser or attorney.
- Reference: Mabry v. State Farm Mutual Automobile Insurance Co. (Georgia, 2001) — landmark case establishing diminished value rights.