Work out second hand value instantly with clear inputs, formula shown and shareable results.
Value depreciates geometrically at the annual rate, then a condition multiplier is applied to the resulting book value. Geometric depreciation means the first year loses the most in absolute terms, which is why buying one year old is usually the value sweet spot.
Book value
book = original price x (1 - annual depreciation) ^ age in years
Adjusted value
value = book value x condition multiplier
book = original price x (1 - annual depreciation) ^ age in years. Value depreciates geometrically at the annual rate, then a condition multiplier is applied to the resulting book value.
Geometric depreciation means the first year loses the most in absolute terms, which is why buying one year old is usually the value sweet spot.
Enter original price, age, annual depreciation, condition. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.