Used Car Value Calculator

How a used car gets a price

Every used-car value starts with one number: what the car cost new. People call it the sticker price, the original MSRP or the window price, and it sets the ceiling for everything that follows. Cars do not lose value in a straight line. They drop hard in the first two years, slow down through year five, then flatten out until the only things moving the price are mileage and condition.

The calculator works in percentages first and dollars second. That matters, because a $60,000 truck losing 20% in year one gives up $12,000, while a $24,000 sedan losing the same 20% gives up $4,800. One curve, different dollars. Working in percentages keeps the model usable across price ranges, and the dollar figure at the end is the number a buyer or a dealer will argue about.

Two corrections land on top of the curve. Mileage is the first: a car 20,000 miles above average is not scrap, it is closer to its next set of tires, brakes and belts, and buyers discount for that. Condition is the second: paint, tires, warning lights and service records. Most of what a seller worries about, from the color to the wheels, is already baked into those two numbers.

The depreciation curve, year by year

The table below is the curve this calculator uses. The middle column is the share of the original sticker the car keeps, and the right column shows what that looks like on a $28,000 car.

The steep part is years one to three. A new car driven off the lot loses about 20% before the first oil change, another 8% in year two, and 7% in year three. By year five it keeps a little over half its sticker. After year eight the yearly drop is small enough that a $28,000 car and a $30,000 car of the same age land within a few hundred dollars of each other.

Past year fifteen the model takes off 1.5 points a year and stops at 12%. Old cars do not go to zero. A running, inspectable car holds a few thousand dollars of value whatever the calendar says, which is why the curve bottoms out instead of running into the ground. The fuel economy figures at fueleconomy.gov are a useful sanity check on a car of this age, since running costs are part of what a buyer weighs.

Worked example: a seven-year-old sedan

Take a 2019 sedan with a $28,000 sticker, seven years old, 95,000 miles on the odometer, in good condition. The calculator runs four steps.

• Depreciation: 45% of $28,000 is $12,600
• Average miles for seven years: 7 x 12,000 = 84,000
• Miles over average: 95,000 minus 84,000 is 11,000, which at 10 cents a mile takes off $1,100
• Private-party value: $12,600 minus $1,100 is $11,500

From there the two dealer numbers follow. A trade-in offer sits near 85% of the private figure, so $9,775. A dealer who reconditions the car and puts it on the lot asks about 15% above the private figure, so $13,225. The spread between the lowest and the highest of those three is $3,450 on the same car in the same week.

Run the same math on a three-year-old SUV with a $36,000 sticker and 45,000 miles. It keeps 65%, or $23,400. Average miles would be 36,000, so 9,000 miles over average costs $900 and leaves $22,500 private party, $19,125 on trade and $25,875 at retail. A five-year-old car with a $30,000 sticker and 40,000 miles keeps 54%, or $16,200, and 20,000 miles under average adds $800 back, for $17,000.

Mileage is the second lever

Twelve thousand miles a year is the line most valuation guides draw, and it is the line this calculator uses. Below it a car is worth more, above it less. The real adjustment is not linear, but a flat rate per mile is close enough to plan with and easy to explain to a buyer.

The rate is 10 cents a mile for every mile over the average and 4 cents a mile back for every mile under it, capped at $1,200 of credit. The cap matters. A ten-year-old car with 40,000 miles is not worth double a 120,000-mile one, it is worth somewhat more, because the rubber, the fluids and the seals aged whether or not the engine ran.

Two cars of the same age can sit $3,000 apart on mileage alone. On a $12,600 base, 30,000 miles over average takes off $3,000, close to a quarter of the car. That is the single biggest reason two listings that look identical carry different prices, and it is the first thing a dealer checks after the year and the model.

Highway miles are worth more than city miles, and no per-mile formula knows the difference. A car with 110,000 miles of steady commuting at 70 mph has less wear on the brakes, the transmission and the suspension than one with 70,000 miles of stop-and-go deliveries. If that is your car, say so in the listing and bring the records.

Trade-in, private sale and dealer retail

The same car is worth three different numbers depending on who is buying, and the gap is not small. A private buyer pays the most, because there is no lot, no warranty and no reconditioning in the middle. A dealer pays the least, because the car has to be cleaned, repaired, insured, floored and sold, and the store carries the risk of it sitting for sixty days.

On the 2019 sedan the gap from trade-in to retail is $3,450, which is 35% of the trade-in offer. That is the dealer's room to work: reconditioning, advertising, the salesperson and the profit. Knowing the number changes the conversation. A seller who walks in with both a private-party figure and a trade-in figure can ask the store to split the difference, and stores do that often, especially at the end of a month.

Private sale is not free money. It costs a weekend of showing the car, a test drive with a stranger, a payment method that cannot be reversed, and a title transfer the seller usually handles. Most states want a bill of sale and a release of liability filed with the motor vehicle agency, and some want a smog certificate. Price that time in before deciding the extra 15% is worth it.

Condition, history and paperwork

Condition is where the model is blunt and the real world is not. The calculator uses four settings. Excellent means no visible damage, matching tires, full service records and a clean history. Good means normal wear for the age: a couple of stone chips, tires with life left, no warning lights. Fair means visible damage, worn tires, or a known repair that has not been done. Rough means it runs but needs work to pass inspection.

Those settings move the number about 8% up and 12% to 28% down, which is less than most sellers expect. A branded title is the exception, and no curve covers it. A rebuilt or salvage title typically cuts value by 20% to 40% on its own, because the resale market for it is thin and financing is hard to arrange. Flood damage and an odometer discrepancy land in the same place.

Records are the cheapest value you can add. A folder with oil change receipts, a timing belt invoice and a set of tires bought last year is worth a few hundred dollars at sale time and costs nothing to keep. Buyers pay for proof, and the absence of proof reads as a problem even when the car is fine.

What a dealer does with your number

A dealer does not value your car the way a private buyer does. The used-car manager opens an auction guide, finds your car at your mileage, and reads a number that reflects what similar cars sold for at auction last week. Then the manager subtracts reconditioning, transport and a margin, and that is the offer. The retail price on the lot is a separate number built from local competition.

This is why an online instant offer and a lot offer can differ by a thousand dollars. The online tool prices the car as you described it; the lot prices it as the appraiser sees it. Clean the car, bring both keys, bring the title, and bring the service records. A car that smells of smoke or has a check engine light is priced as a wholesale unit no matter what the guide says.

Negotiation works best when the trade and the purchase stay separate. Agree on the price of the new car first, in writing, then discuss the trade. Stores can move money between the two numbers, and a discount on the new car can quietly return as a lower trade offer. The IRS page on using a car for business is worth reading if you claim mileage, because the value you establish here is also the basis for depreciation.

Timing and region move the price too

Season and region move a used car a few percent either way. Convertibles and sports cars sell for more in April and May and sit in November. Four-wheel drive sells in the first snow and is discounted in July. A truck in rural Texas and the same truck downtown in a wet city are not the same asset.

End of month, end of quarter and end of model year are the three windows when a store is most willing to pay up for a clean trade, because it is chasing a number. The last week of December is often the softest week for buyers and the hardest for sellers. If you can wait three weeks, wait.

One more thing the calculator cannot see is the local market. A model with a reputation for a failing transmission loses value faster than the curve suggests, and a model with a following holds value longer. Check what similar cars ask within 50 miles, then use this estimate as the start of the conversation rather than the final word. The NHTSA recall look-up is the fastest way to check an open safety recall, and an open recall on your car is a negotiation point in either direction.