Car Service Due

Work out where you are between services: miles covered since the last one, roughly how many months that is at your annual mileage, whether you are already past either interval, and — the part people get wrong — which of the two limits, distance or time, you will hit first. You supply the intervals from your own service book, so the answer is about your car rather than an average one.

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Worked example

Car service check Miles since last service 8,500 mi (42,500 − 34,000) Estimated months since 12.8 months (at 8,000 miles/year) Your mileage interval 10,000 mi Your time interval 12 months Status: DUE NOW — the time interval has passed (estimated from your annual mileage). Miles until the mileage interval: 1,500 mi Due on time: 2026-03-14 Due on mileage: about 2026-06-14 (at 8,000 miles/year) Triggers first: TIME — at 8,000 miles/year you reach 12 months before you reach 10,000 mi. The intervals above are your numbers, not ours. Take them from your own owner's manual or service book: they differ by make, model, engine, oil specification and how the car is used, and a figure printed here would be wrong for somebody. Long-life and fixed schedules differ, severe use shortens both, and this is a reminder — not a roadworthiness or safety check.

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Inputs

Current odometer (mi)
42500
Odometer at last service (mi)
34000
Service interval (mi)
10000
Miles you drive per year
8000
Last service date (YYYY-MM-DD)
2025-03-14
Service interval (months)
12

Frequently asked

Why doesn't it know my service interval?

Because intervals differ by make, model, engine, oil specification and how the car is used, and a number printed here would be wrong for somebody and then relied on. Take yours from your owner's manual or service book and type it in.

Why are the months estimated?

The months since your last service are worked out from your annual mileage, and the mileage due date is projected the same way. The time-interval date comes straight from the date you entered.

Does this mean the car is safe or roadworthy?

No. It is a reminder about a schedule, not an inspection. Servicing is separate from any legal roadworthiness test, and anything that feels wrong to drive should be looked at now rather than at the next service.