How is a used car appraised — how do condition and mileage adjust the value?

A used car is appraised by starting from a market basis for the exact VIN and then moving that basis line by line for the facts of the specific car — the odometer reading, any title brand, and each condition finding — with every adjustment carried as its own named line rather than folded into one figure. The basis is what the market pays for a clean example of that year, make, model, and trim right now; the adjustments are what makes your car different from a clean example. Add them up against the basis and you have the appraised number, and because each line is named and sourced, you can read exactly why the number is what it is instead of taking a single verdict on faith. That traceability — basis, then adjustments, then the sum — is the whole difference between an appraisal and a guess.

The basis: where the number starts

Every honest appraisal begins with a market basis, not with the appraiser's opinion. For a given VIN the market doesn't set one price — it sets five, each answering a different question about the same car: what it retails for on a lot, what it brings private-party, what a dealer allows on trade, what it moves for wholesale, and what it clears at auction. These five bands are read from live comparable sales for that exact year, make, model, and trim, each carried with its source and the timestamp it was set, so the starting point is the market's current reading, dated — not a folk memory of what the car "should" be worth.

Which band you start from depends on what the appraisal is for. A dealer sizing a trade works from the trade band; a private seller reads private-party. But the method is the same either way: pick the market basis, then adjust it for the car in front of you. You can read all five bands, with the comparable sales behind each, free and with no account at values.vin — the basis is own-data, so it leads, and it costs nothing to see before anyone quotes you a number.

The adjustments: how condition and mileage move it

The basis describes a clean, average-mileage example. Your car is a specific object with a specific history, and each way it departs from that clean example moves the number by its own line. Three kinds of facts do the moving.

Odometer. The basis assumes typical mileage for the car's age. A car with more miles than typical adjusts down; a genuinely low-mileage car can adjust up. The line reads the odometer against the mileage band and states the adjustment — so you see not just that miles mattered, but by how much, and in which direction.

Title brand. A salvage, rebuilt, flood, lemon, or other brand on the title changes what the market will pay, sometimes sharply, because it changes what a future buyer can be told and what a future lender or insurer will accept. When the record carries a brand, it moves the basis on its own line, and the line names the brand doing the moving. A clean title adjusts nothing here — the line simply reads clean and passes through.

Condition findings. This is everything a walkaround or inspection turns up: tires near the wear bars, a scraped bumper, a check-engine code, worn brakes, hail dimples, a torn seat. Each finding is priced as its own adjustment against the basis — one line per finding — rather than swept into a single unexplained haircut. That is the part of the method most likely to be done in silence, and the part most worth making explicit: a car with four findings should show four lines, each named and each priced, not one round number with the reasoning left in the appraiser's head.

Sum the adjustments against the basis and the result is the appraised number, dated when it was made. Nothing is invented. Where a fact isn't in the record, the line is left open rather than filled with a guess — an absent line is honest; a made-up one is not.

Why the line-by-line matters more than the total

A single appraised figure is unarguable, because there's nothing to argue with — you can't check a number that arrives without its math. A sheet of named lines is the opposite: every adjustment is a claim you can inspect. If the miles line looks steep, you can see the mileage it read and the band it read against. If a condition finding is priced high, you can see which finding and ask about that one line instead of the whole number. The appraisal stops being a verdict handed down and becomes a document you can read from either side of the desk — which is exactly what a dealer's used-car manager and the seller holding the car both need it to be, because an appraisal that changes depending on who's looking at it was never an appraisal.

This is also where the precision ladder is worth naming plainly. The base read — the basis and the structure of the adjustments — is free and anonymous. Signing in narrows the read to a range with a confidence for your specific car. Build-level accuracy, the exact-VIN number with licensed overlays priced through, is the paid rung. The number is free; precision is the ladder you climb only as far as the decision in front of you actually needs.

Where the appraisal happens, and where it goes

The act of appraising a VIN — reading the basis and moving it line by line — homes at appraisal.vin, free at every VIN and needing no account. This face reads and adjusts; it does not buy the car. The condition-and-value record the appraisal writes travels with the car afterward, keyed to its VIN, so the work is never done twice from scratch.

From there the number carries. The appraised figure is the number to walk in holding at tradein.vin, where the trade band tells you what a desk's version of the number is worth so you can weigh its offer against a real reading rather than against nothing. And all five market bands with the comparable sales behind each read free at values.vin — the basis the whole appraisal is built on, in one place, before anyone quotes you a figure.