Oil change interval calculator
Enter the date and odometer of your last oil change, your current reading and the interval for your car. The calculator shows the odometer reading and the date the change falls due by distance and by time, and which of the two comes first. Take the intervals from your owner's manual; this tool does not know them.
Runs in your browser: nothing you enter is sent anywhere.
How to use it
- Choose kilometres or miles.
- Enter the date and odometer of the last oil change, and the odometer now.
- Enter the interval by distance and by months from your owner’s manual.
- Enter roughly how far you drive in a year; it turns the distance limit into a date.
How it works
- Due odometer = odometer at last change + distance interval.
- Date by time = date of last change + the interval in months.
- Date by distance = today + (due odometer − current odometer) ÷ distance per year × 365.25 days.
- The result is the earlier of the two dates, and the tool says which limit comes first.
Worked example
Last change on 3 May 2026 at 50,000 km, now 56,000 km, interval 10,000 km or 12 months, 12,000 km a year. Due odometer 60,000 km, 4,000 km left, which at 12,000 km a year is about 122 days: 5 March 2027. The time limit falls on 3 May 2027, so distance comes first.
Tips
- Update the odometer whenever you check; the distance date moves with how much you actually drive.
- Severe use may call for shorter intervals; check the manual.
- Keep a record of services in the car maintenance log on this site.
Frequently asked questions
What oil change interval should I enter?
Use the interval in your owner's manual or service booklet. Many manuals give a distance and a time, for example a figure in kilometres or miles and a number of months, and ask you to follow whichever limit is reached first. Some also shorten the interval for severe use such as short trips, towing or dust; this calculator takes whatever numbers you type.
How is the date by distance estimated?
Distance left (due odometer minus current odometer) is divided by the distance you drive per year and multiplied by 365.25 days, then counted from today. It is only as good as your yearly figure. If you are already past the due odometer, the date is today.
What happens at the end of a month?
Months are added to the date of the last change. If that day does not exist in the target month, the last day of that month is used, so 31 August plus 6 months gives 28 February.
Does this replace the service reminder in my car?
No. It is a planning aid based on numbers you enter. If your car has an oil-life monitor or a service indicator, follow what the manual says about it.