Car Depreciation Calculator
At a fixed 15% annual depreciation rate, a $30,000 current vehicle value falls to an estimated $13,311.16 after 5 years. This car depreciation calculator applies one compound percentage loss to the value remaining each year. It reports projected future value, total estimated depreciation, and percentage of current value retained. It is a planning scenario, not an appraisal, trade-in quote, loan balance, or tax calculation.
Quick answer
This model compounds the loss, so each year's drop applies to a smaller value than the year before.
This estimate assumes the car loses the same percentage of value every year. It does not adjust for mileage, accidents, trim, maintenance history, or local demand.
What this tells you
- •This model compounds the loss, so each year's drop applies to a smaller value than the year before.
- •Higher annual depreciation rates cut future value much faster over longer timelines.
- •Total depreciation is the current vehicle value minus the projected future value.
- •The starting amount should represent current value unless the projection begins on the purchase date.
- •A 0% rate keeps value unchanged, while 100% produces zero future value after any positive period.
- •Decimal years are accepted and apply the annual retention factor to a fractional exponent.
- •Dollar results and the retained percentage are rounded to 2 decimal places.
How to Use
- 1Enter the car's current estimated value in dollars.
- 2Enter the annual depreciation rate as a percent, such as 15 for 15% per year.
- 3Enter the number of years you want to project forward. Decimal years are allowed for rough mid-year estimates.
- 4Calculate to see the projected vehicle value, total depreciation, and value retained percentage.
- 5Run more than one rate scenario because actual depreciation rarely follows one stable percentage.
- 6Compare the estimate with current listings or valuation sources that match trim, mileage, condition, and location.
How It Works
Formula
Future value = Current value × (1 - annual depreciation rate)^years
Total depreciation = Current value - Future value
Example: $30,000 × (1 - 0.15)^5 = $13,311.16Convert the annual rate from percent to decimal and subtract it from 1 to get the yearly retention factor. Raise that factor to the entered years, including a fractional year when supplied, and multiply by current value. At 15%, the factor is 0.85. Five years gives 0.85^5 = 0.4437053, so $30,000 becomes $13,311.16 after rounding. Total depreciation is $16,688.84 and retained value is 44.37%. This is declining-balance depreciation, not the same dollar loss every year.
Calculation note: values are processed in the order shown above, using the current input units.
Worked Examples
Mid-priced car after 5 years
With a fixed 15% annual drop, the car keeps about 44.37% of its starting value after 5 years. That means a little more than half of the value is gone across the projection period.
Newer SUV with slower annual depreciation
A lower annual depreciation rate leaves more value on the table. In this case, the SUV still retains about 68.15% of its current value after 3 years.
No depreciation scenario
A 0% rate creates a retention factor of 1. Raising 1 to any supported year value keeps the estimate at $20,000 and retains 100% of current value.
Fractional 2.5-year projection
The formula uses $18,000 x 0.9^2.5. That gives $13,831.80 after rounding and 76.84% retained value. A fractional exponent assumes the annual rate accrues smoothly.
Full 100% depreciation over one year
A 100% rate makes the retention factor zero. For a positive one-year period, the model returns no remaining value. This boundary demonstrates the formula and is not a typical resale assumption.
What 15% annual depreciation looks like on $30,000
This quick table shows how the same current vehicle value changes when the annual depreciation rate stays fixed at 15%.
| Years | Projected value | Total depreciation | Value retained |
|---|---|---|---|
| 1 | $25,500.00 | $4,500.00 | 85.00% |
| 3 | $18,423.75 | $11,576.25 | 61.41% |
| 5 | $13,311.16 | $16,688.84 | 44.37% |
| 7 | $9,617.31 | $20,382.69 | 32.06% |
Real vehicles do not lose the same percentage every year. Mileage, brand, accidents, condition, and local demand can move value up or down.
Why a fixed rate is only a scenario
Vehicle depreciation often changes with age. A new vehicle may lose value quickly early on, then decline more slowly. Applying one rate across every year is useful for comparison, but it cannot recreate an uneven market path.
Current value also depends on which market is being measured. Dealer retail, private-party sale, and trade-in values can differ at the same moment. Use a starting value and future comparison that refer to the same basis.
Depreciation is separate from financing. A car can be worth less than its loan payoff, but this calculator does not know the loan balance, interest, payments, or fees.
Common mistakes
- Entering 0.15 when you mean 15%, which understates the depreciation rate by a factor of 100
- Using the original purchase price instead of the car's current market value
- Treating one flat annual rate as a resale quote even though mileage, condition, options, and location can change the outcome
- Comparing projected market value with a loan payoff as though they were calculated by the same method
- Assuming total depreciation is tax-deductible without checking vehicle use and applicable tax rules
- Choosing one optimistic rate instead of testing a reasonable range
Limitations
This calculator assumes one constant compound depreciation rate applied smoothly for the full period. It does not model year-specific rates, mileage, make, model, trim, options, condition, service history, accidents, title status, modifications, recalls, fuel prices, regional demand, inflation, taxes, transaction costs, dealer spread, warranty, or corporate and fleet pricing. It also does not calculate a loan payoff, lease residual, insurance settlement, or official tax basis. Decimal-year estimates assume fractional compounding that may not match a valuation source.
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