Car Depreciation Calculator estimates the loss in vehicle value across a chosen ownership period, factoring in purchase price, vehicle age, mileage, and market demand conditions.
Calculate Your Car’s Future Resale Value by Make, Mileage, and Market Conditions
This calculator projects how much a vehicle will be worth after one or more years of ownership, based on its purchase price, model year, current mileage, and current market demand. It’s built for car buyers comparing new versus used purchases, owners deciding when to sell or trade in, and shoppers estimating a lease-end or loan-payoff gap before it happens.
Entering Your Vehicle’s Purchase Price, Mileage, and Market Details
Enter the purchase price, model year, current odometer reading, and expected annual mileage. Choose a depreciation category — economy, standard, luxury, or EV — or enter custom annual percentages. Rates apply as nominal annual figures, compounded once per year rather than monthly, so results reflect year-end values only.
How the First-Year Drop and Annual Depreciation Rate Are Calculated
The projection uses a two-stage declining-balance model: a larger one-time drop in the first year, followed by a smaller rate compounded annually for every year after that.
$$V_1 = P \times (1 – r_1)$$
$$V_n = V_1 \times (1 – r_n)^{\,n-1}$$
$$V_{lost} = P – V_n$$
$$r_{eff} = 1 – \left(\dfrac{V_n}{P}\right)^{1/n}$$
Here $P$ is the purchase price, $r_1$ is the first-year depreciation rate, $r_n$ is the subsequent-year annual rate, $n$ is the projection period in years, and $r_{eff}$ is the effective compound annual rate over the whole period.
The front-loaded shape of this curve — a steep first-year drop followed by a milder, roughly constant annual rate — is a widely cited pattern in consumer auto-finance guidance, not a government-set formula or statutory table.
Kelley Blue Book and State Farm both report new vehicles losing approximately 20% of value in the first year, and State Farm, Ramsey Solutions, and Kelley Blue Book each put total loss at roughly 55–60% by year five; treat these as industry rules of thumb rather than fixed percentages, since exact figures vary by publisher and vehicle segment.
The default per-category rates built into this calculator (for example, 20%/15% for economy vehicles rising to 30%/18% for luxury vehicles) follow that same front-loaded pattern, but they are this tool’s own configured assumptions rather than a single published rate table — use the Custom Rates option if you have appraisal-guide figures specific to your make and model.
The market-condition adjustment (±15%) and the mileage adjustment (0.5 percentage points per 1,000 annual miles above or below a 12,000-mile baseline) are internal modeling assumptions built into this calculator to reflect known directional effects — high demand slows depreciation, low demand and higher mileage speed it up. We could not verify these specific magnitudes against a published industry source, so treat them as illustrative sensitivity adjustments rather than benchmarked figures.
Common input mistakes to watch for:
- Entering a used car’s asking price as the purchase price while leaving the Vehicle Year and Odometer fields at low-mileage, current-year defaults — this applies new-car assumptions to a car that’s already partway through its depreciation curve.
- Typing a custom rate as a decimal (0.20) instead of a whole percentage (20) in the First Year Drop or Subsequent Drop fields, which understates the projected loss by a factor of 100.
- Entering total lifetime miles into the Annual Mileage field instead of the Current Odometer field, which sharply overstates the yearly mileage adjustment.
Purchase price must be greater than zero, and the projection period accepts whole years starting at 0; entering 0 years returns the unadjusted purchase price, since no depreciation period has elapsed yet. Selecting a Vehicle Year in the future is treated as a brand-new, current-model vehicle.
Entering a Current Odometer reading above 5,000 miles reclassifies the vehicle as used internally, so the calculator skips the steep first-year rate entirely and applies the milder ongoing annual rate starting in year one — even for a vehicle of the current model year.
At very long projection periods (20-plus years), the compounding pushes the projected value toward zero, which doesn’t reflect real markets, since most vehicles retain some nonzero scrap or parts value indefinitely; treat outputs beyond roughly a 10-year horizon as directional rather than literal.
The calculator accepts several currencies for convenience, but the depreciation research cited above reflects U.S. new- and used-vehicle market data; depreciation patterns elsewhere can differ meaningfully due to import duties, local demand, and used-car supply, so treat the underlying percentages as a U.S.-market reference point regardless of which currency you select.
Because the output depends entirely on the rates and mileage assumptions you enter rather than an inspection of your specific vehicle’s condition or accident history, treat the projected value as an educational estimate for budgeting and comparison purposes only — not a formal appraisal, and not tax, investment, or financial advice.
What a Typical Five-Year Depreciation Curve Looks Like
Commonly Cited Value-Loss Benchmarks by Ownership Length
| Ownership period | Typical cumulative value lost | Source |
|---|---|---|
| First month | ~10% | Carfax, State Farm (accessed July 2026) |
| Year 1 | ~20% | State Farm, Kelley Blue Book (accessed July 2026) |
| Year 5 | ~55–60% | State Farm, Kelley Blue Book, Ramsey Solutions (accessed July 2026) |
These are rounded, widely-cited industry rules of thumb rather than a single official table, and individual sources report figures that vary by a few percentage points depending on vehicle segment and methodology — confirm current figures with the cited publishers before relying on them for a specific vehicle.
Answers to Common Car Depreciation Questions
Does this calculator use my car’s actual resale value?
No. It projects an estimate based on the depreciation rates, mileage, and market condition you select — not a live market lookup or VIN-specific appraisal. For an actual resale estimate, compare current listings or get a dealer or third-party appraisal.
Why does a used car with low mileage still get a milder first-year rate?
The calculator treats any vehicle with a model year older than the current year, or more than 5,000 miles on the odometer, as having already passed its steepest ownership-based depreciation, so it applies the ongoing annual rate instead of the new-car first-year rate.
Is this the same as depreciation for tax purposes?
No. This tool estimates market resale value, not the accounting or tax depreciation (such as MACRS) used for business vehicle deductions — those follow separate IRS schedules and are unrelated to what a vehicle would actually sell for.
How does high mileage affect the projection?
Every 1,000 miles driven annually above the 12,000-mile baseline adds roughly 0.5 percentage points to the depreciation rate, and driving below that baseline reduces it by the same amount, reflecting that higher-mileage vehicles typically resell for less.
Can I use my own depreciation percentages instead of the presets?
Yes. Selecting Custom Rates replaces the built-in category assumptions with a first-year and ongoing annual percentage you enter directly, useful if you have appraisal-guide data specific to your make and model.