Free Used Car Fair Price calculator with clear step-by-step results.
Depreciates the original price geometrically by age, then adjusts for how far the odometer sits above or below the expected reading for that age at roughly five cents per excess kilometre, and finally applies a condition and history adjustment for service records, damage or desirable specification.
Value from age
Value = original price x (1 - annual depreciation)^age
Mileage adjustment
Adjustment = -(odometer - expected km per year x age) x 0.05
An indicative estimate only. Actual market value depends on local demand, specification, service history, condition, accident record and outstanding finance. Obtain a professional valuation and history check before transacting.
It is a working average for a mainstream car. Premium and performance models are penalised more heavily for high mileage, and very low-mileage examples can attract a premium above this.
Because cars lose a percentage of remaining value each year rather than a fixed amount, which is why the first year is by far the most expensive.