Car Depreciation Calculator

Background.

A new vehicle does not lose value at a steady, predictable rate the way an accounting spreadsheet might assume — it drops hardest in the first year, then settles into a shallower but still compounding decline for every year after. This calculator models that specific two-phase curve: a steep year-one percentage (the classic "drove it off the lot" drop, commonly estimated around 20% for a new vehicle) followed by a smaller annual percentage applied to whatever value remains (commonly estimated around 15% a year, compounding, for the next several years). It is a deliberately different shape from the straight-line, declining-balance, or sum-of-years-digits methods this site's generic depreciation calculator offers for business and tax accounting — those methods assume a smooth, formula-driven decline toward a salvage value over a fixed useful life, which is the right tool for depreciating office equipment or a rental property on a tax return, but the wrong tool for estimating what a specific used car is actually worth on the resale market.

The reason vehicles front-load their depreciation so heavily comes down to how the market treats "new" versus "used." The moment a car is titled and driven off the dealer's lot, it legally becomes a used vehicle, and used-vehicle buyers pay meaningfully less than new-vehicle buyers even for a car with a handful of miles on it — the new-car premium (dealer holdback, incentives, warranty framing, and the simple psychological value of being the first owner) evaporates almost immediately. After that first-year cliff, the decline slows because the car is now competing in the broader used-car market against other used cars of similar age and condition, where the value differences from one additional year of age are smaller and more gradual.

Running the numbers on a default $35,000 purchase — a 20% first-year drop followed by five years compounding at 15% a year — this calculator estimates the vehicle retains only about 41.8% of its original value after five years, which lines up closely with the commonly cited industry statistic that a new vehicle is worth roughly 40% of its purchase price after half a decade of ownership. That is not a coincidence baked into the defaults; it is the natural result of compounding a realistic first-year rate against a realistic ongoing rate, which is exactly the internal cross-check that gives this calculator's curve credibility as an estimate rather than an arbitrary formula.

Understanding this curve matters most at two decision points: buying and selling. On the buying side, it is the mathematical case for considering a lightly used (one- or two-year-old) vehicle instead of new — a car that has already absorbed its steepest depreciation year can often be bought for meaningfully less than new while still delivering most of its useful life, essentially letting the FIRST owner absorb the worst of the curve. On the selling or trading side, it explains why financing a new car over a long term (72 or 84 months) is a genuine risk: the loan balance falls in a straight line while the car's value falls in this steep, front-loaded curve, which is exactly how new-car buyers end up owing more than the car is worth ("negative equity" or "upside down") for the first two to three years of ownership. This calculator's related car loan and car affordability tools on this site model the financing side of that same problem; this one is built specifically to answer "what will this car actually be worth," which is the number that decision ultimately depends on.

What is car depreciation calculator?

Vehicle depreciation is the loss in a car's market resale or trade-in value over time, distinct from the accounting concept of depreciation used on a business's tax return (which follows one of several standardized formulas — straight-line, declining balance, or sum-of-years-digits — applied against a fixed useful life and salvage value, and which is what this site's generic depreciation calculator models). Market depreciation follows real buyer and seller behavior rather than an accounting formula, and the shape that behavior produces is well documented: a large, front-loaded drop in the first year (commonly cited around 20% for a typical new vehicle, driven by the new-to-used transition the moment a car is titled and driven), followed by a shallower but still meaningful annual decline for the next several years (commonly cited around 15% a year, compounding against whatever value remains, through roughly the five-year mark) as the vehicle competes in the broader used-car market on age, mileage, and condition rather than "newness." This calculator applies that two-rate curve — a distinct year-one input and a distinct subsequent-year input, both user-adjustable — to a purchase price over a chosen number of years, which is a meaningfully different mathematical shape than any single-rate depreciation method: because the subsequent rate compounds against an ALREADY-REDUCED balance each year, the dollar amount lost shrinks every year even while the percentage rate applied stays constant, which is exactly the pattern real used-car pricing data shows and exactly the pattern a flat straight-line calculation cannot reproduce.

How to use this calculator.

1. 01Enter the purchase price — what you paid, or plan to pay, for the vehicle new.
2. 02Set the year-1 depreciation rate. The 20% default reflects commonly cited industry data for a typical new vehicle; some vehicles (in particular, in-demand trucks, certain SUVs, and some luxury brands with strong resale reputations) depreciate less in year one, while others (especially vehicles that were oversupplied, discontinued, or hit by a redesign) depreciate more.
3. 03Set the subsequent-year rate — the annual percentage applied to whatever value remains, for every year after the first. 15% is a commonly cited default; adjust it based on the specific make and model's known resale reputation if you have that data (Kelley Blue Book, Edmunds, and CARFAX all publish model-specific residual-value research).
4. 04Set the number of years you want to project forward.
5. 05Read the estimated value as your headline projection, and total value lost / total percent lost as the summary of what that means in dollars and as a share of the original price.
6. 06Compare the year-1 value against the estimated value at your full projection period to see how much of the TOTAL depreciation happens in that first year alone — for the default rates, nearly half of the five-year total dollar loss happens in year one.
7. 07Use this alongside a loan amortization schedule (this site's car loan calculator) to check for negative equity: if the projected value at any point in the first few years falls below the loan's remaining balance, you are financially "underwater" on the vehicle during that window.

The formula.

The curve has two phases. Year one applies a single rate directly to the purchase price: value after year 1 = purchasePrice × (1 − yearOneDepreciationPercent/100). Every year after that compounds a second, typically smaller rate against whatever value remains from the PREVIOUS year, not against the original purchase price: value(t) = value(t−1) × (1 − subsequentAnnualDepreciationPercent/100), repeated for each additional year in the projection. This compounding structure is the mathematical reason the dollar amount lost shrinks every year even at a constant percentage rate — 15% of $28,000 (year 2's loss, $4,200) is a bigger dollar figure than 15% of $23,800 (year 3's loss, $3,570), even though the percentage rate never changes, because each year's 15% is applied to a smaller base than the year before. Total depreciation and the percentage lost follow directly by comparing the final projected value back to the original purchase price: totalDepreciation = purchasePrice − currentValue, and depreciationPercent = totalDepreciation / purchasePrice × 100. The marginal loss in the final projected year — how much value was lost specifically during that last year, as opposed to the cumulative total — is simply the difference between the second-to-last year's value and the final year's value, and it is always smaller in dollar terms than the marginal loss in any earlier year, for the same shrinking-base reason described above.

A worked example.

Frequently asked questions.

References& sources.

1. [1]CARFAX — "Car Depreciation: How Much Value Does a Car Lose Per Year?" Data-driven estimate of new-vehicle depreciation: roughly 20% in the first year, roughly 15% per year through year five, and roughly 40% of original value remaining after five years.
2. [2]Edmunds — True Cost to Own (5-year ownership cost methodology, including a depreciation component alongside financing, insurance, fuel, and maintenance).
3. [3]Internal Revenue Service — Publication 463, Travel, Gift, and Car Expenses (background on the distinction between market-value vehicle depreciation and the standard-mileage-rate depreciation component used for tax purposes).