Car Depreciation Calculator: Value, Loss and Rate

Car Depreciation Calculator

Estimate a car’s current or future value, retained value, depreciation, annualized rate, net sale proceeds and a year-by-year schedule.

Calculation mode

Currency

Starting vehicle value

Use purchase price or value at the beginning of the period.

Elapsed or forecast period (years)

Decimals are allowed; 2.5 means two years and six months.

Projection assumptions

First-year depreciation rate (%)Applied only to the first 12 months.

Later annual depreciation rate (%)Applied to the declining value after year one.

Known market value

Current vehicle valueUse a value appropriate to the same sale channel you are comparing.

Optional adjustments

Market or condition adjustmentPositive increases value; negative reduces it. Enter your own evidence-based adjustment.

Expected sale costsFees or preparation costs reduce proceeds, but are shown separately from depreciation.

Distance driven during periodOptional; used only for depreciation per distance.

Distance unit

Estimated vehicle value and depreciation

Adjusted vehicle value—

Net sale proceeds—

Total depreciation—

Value retained—

Annualized depreciation rate—

Average depreciation per year—

Average depreciation per month—

Depreciation per mile—

Sale costs entered—

Year-by-year projection

Time	Estimated value before adjustment	Loss during period	Cumulative depreciation	Value retained

How the car depreciation calculation works

Projection mode applies a first-year rate to the starting value and then compounds the later rate on the declining balance. Analyze-known-value mode works backward from a current value to calculate actual loss and the equivalent compound annual rate for the entered period.

Projected value after first year = starting value × (1 − first-year rate)
Later value = prior value × (1 − later annual rate)^years
Annualized depreciation rate = 1 − (adjusted value ÷ starting value)^{1 ÷ years}

For a partial year, the applicable annual retention factor is raised to the fractional part of the year. The optional condition adjustment changes the estimated market value. Sale costs are then subtracted only from net proceeds, so they are not mislabeled as depreciation.

Example

A starting value of 40,000, a four-year period, 20% first-year depreciation and 12% in each later year produces 21,807.10 before adjustments. With 500 of sale costs, estimated net proceeds are 21,307.10. Change every assumption to reflect the specific vehicle and market.

Important limits

This calculator is an editable scenario, not a live vehicle appraisal, tax-depreciation schedule or guarantee of resale value. It does not identify trim, options, accident history, title status, local supply, demand or dealer margins. Rates vary sharply by make, model, age, mileage, condition and sale channel. Use recent comparable listings, written trade offers or valuation services to choose the inputs. For tax depreciation, use the rules and basis that apply to your jurisdiction and situation.

Related calculators

Compare the purchase with the Car Affordability Calculator, calculate financing with the Auto Loan Calculator, or compare a contractual buyout with market value using the Lease Buyout Calculator.