Used Car Value Calculator converts a vehicle’s original MSRP, current odometer, condition, and accident history into an estimated private-party price and dealer trade-in range.
Estimate Your Used Car’s Value for Trade-In, Private Sale, and Retail
This calculator projects your vehicle’s private-party price, dealer trade-in offer, and retail range from its age, mileage, condition, and accident history. Private sellers checking a fair asking price, buyers sanity-checking a dealer’s quote, and owners deciding whether to trade in or sell independently all use it to get a starting number before negotiating.
How to Enter Your Vehicle’s Details for an Accurate Estimate
Enter the original MSRP, current odometer reading, model year, and vehicle category, then select condition, accident history, and ownership details, choosing whichever currency and distance unit fits. The calculator returns a private-party value, a trade-in/retail range, and a percentage of original value retained.
How This Calculator Estimates Depreciation, Mileage, and Condition Adjustments
No government agency or standards body publishes a formula for used-vehicle market value — unlike EPA fuel economy testing or SAE torque conventions, resale pricing comes from proprietary transaction databases (Kelley Blue Book, NADA/J.D. Power, Black Book) that don’t disclose their exact algorithms.
This calculator instead builds a transparent model from published industry figures. Category-specific depreciation is anchored to iSeeCars’ 2023 analysis of over 1.1 million used-vehicle sales, which found average 5-year depreciation of 36.3% for compact/economy cars, 41.2% for SUVs, 48.1% for luxury vehicles, and 49.1% for EVs, with hybrids and trucks losing the least (35–37%). This is a widely-cited industry study, not a formal standard, and the label applies throughout this section.
This calculator converts those cumulative 5-year figures into an approximate front-loaded annual curve:
$$V_{age} = MSRP \times (1 – r_1) \times (1 – r_n)^{(age-1)}$$
where $r_1$ is the first-year rate and $r_n$ is the assumed rate for each subsequent year, both set per category to approximate the iSeeCars totals — this curve-fitting is this calculator’s own modeling choice, not a published formula.
Mileage is judged against a 12,000-mile-per-year baseline, a convention used in lease agreements and Kelley Blue Book’s valuation tools, though the Federal Highway Administration’s measured average runs closer to 13,400–14,300 miles per year, so this default is slightly conservative.
Condition, accident history, ownership records, and market-demand adjustments are modeling assumptions built into this tool, since no public dataset breaks these discounts out numerically. Trade-in and retail bounds around the private-party figure follow Kelley Blue Book’s commonly cited spread of trade-in offers running 10–20% below private-party value.
A common input mistake is entering the current asking price instead of the original MSRP — the calculator needs the vehicle’s price when new, or the entire depreciation curve is measured from the wrong starting point.
MSRP must be a positive number and odometer reading zero or greater; a blank or zero MSRP halts the calculation instead of returning a nonsensical value. For vehicles older than roughly 20–23 years, the compounding formula above would mathematically decay toward zero, so this calculator floors the estimate at 8% of original MSRP — real transaction data shows a functioning vehicle retains baseline scrap, parts, and utility value rather than depreciating to nothing.
Mileage adjustments are similarly capped at ±40% of the base value, so an odometer reading far outside the expected range, unusually low or well past 300,000, can’t overwhelm the rest of the estimate.
Why Depreciation Slows Down: Value Retained by Vehicle Age
Reference Figures Used in This Calculator’s Assumptions
| Reference | Figure | Source |
|---|---|---|
| Economy/compact, 5-year depreciation | 36.3% | iSeeCars, 2023 study |
| SUV, 5-year depreciation | 41.2% | iSeeCars, 2023 study |
| Luxury, 5-year depreciation | 48.1% | iSeeCars, 2023 study |
| Hybrid/Truck, 5-year depreciation | 35–37% | iSeeCars, 2023 study |
| EV, 5-year depreciation | 49.1% | iSeeCars, 2023 study |
| Assumed annual mileage baseline | 12,000 mi/yr | Leasing industry convention; Kelley Blue Book |
| Actual measured average mileage | 13,400–14,300 mi/yr | Federal Highway Administration |
| Trade-in vs. private-party spread | 10–20% lower | Kelley Blue Book |
Common Questions About Used Car Value Calculations
Why is my trade-in offer lower than the calculator’s private-party estimate?
Dealers price in reconditioning, holding costs, and resale profit before reselling your car. Kelley Blue Book puts this gap at roughly 10 to 20 percent below private-party value, and this calculator applies that spread directly to your estimate.
Does higher-than-average mileage always lower the estimate more than age does?
Not necessarily. Mileage adjustments are capped at plus or minus 40 percent of the base value, so a heavily driven car cannot lose more than that share even far past the 12,000-mile-per-year baseline this calculator assumes.
Why doesn’t a 20-year-old car’s estimated value hit zero?
This calculator floors every estimate at 8 percent of original MSRP. Running vehicles retain baseline parts, scrap, and utility value rather than depreciating toward zero, so the compounding formula stops decaying past that point.
Should I enter the price I paid or the original sticker price?
Enter the original MSRP from when the car was new, not what you paid for it used. Substituting a used purchase price shifts the entire depreciation curve to the wrong starting value.
Why do electric vehicles show a steeper depreciation curve than gas SUVs?
iSeeCars data shows EVs losing about 49 percent of value over five years versus roughly 41 percent for SUVs, which likely reflects fast-evolving battery technology and narrowing price gaps between new and used EVs.