Kilometres, Miles and Car Values: Avoid an Expensive Input Mistake

The conversions worth checking

60,000 miles is approximately 96,561 km. 90,000 miles is approximately 144,841 km. In the other direction, 100,000 km is approximately 62,137 miles. A car advertised at “90k” could therefore mean two materially different odometer readings.

If you type 90,000 into a kilometres field when the odometer shows miles, you understate the converted mileage by about 54,841 km. Correcting that input can change which adverts are selected; it does not imply a fixed euro penalty per kilometre.

How mileage enters our valuation

The current CarValue.ie engine selects nearby-mileage listings after other vehicle filters. Where the initial group is too small, the permitted band can widen. The result includes the mileage band and the number of comparisons actually used.

This is a comparison method, not a straight-line depreciation formula. If there are few cars near your reading, the estimate may rest on a broader group. A higher-mileage car with excellent history and a lower-mileage car with unresolved faults are still different propositions.

Compare the same unit across the shortlist

Create a shortlist with a kilometres column even if some original adverts use miles. Keep the original number and unit beside it so the conversion remains auditable. Separate the asking price from any running-cost or repair estimates.

Then check year, engine, fuel, body style and seller type. Converting mileage correctly does not make an estate, a performance model and a basic hatchback equivalent. The unit is only the first step in building a useful group.

Do not infer history from the number alone

A single odometer photograph is a point-in-time reading. Service records and dated test documents help establish the sequence. If a record seems inconsistent, ask for an explanation and an independent inspection before treating the car as comparable to a well-documented example.

For a sales advert, state the unit explicitly in the description and use the marketplace’s matching unit selector. If the display can switch between miles and kilometres, identify which reading your photograph shows.

A quick check before paying for a report

Read the dashboard, confirm the unit, and review the number in the form. After the report arrives, check the selected mileage band against your actual car. Correct input is cheaper and more useful than trying to explain a surprising result afterwards.

• Use km = miles × 1.609344.
• Use miles = km ÷ 1.609344.
• Round only after converting.
• Never assume an unlabeled “k” means kilometres.