Tools you can use now
Eight calculators for a car you already have. They do not look up a model, and they do not need an account. The results stay in the page until you leave.
Fuel economy
Distance and fuel in, liters per 100 km and mpg out.
Open the calculator
Trip fuel cost
Distance, L/100 km, and pump price into liters and total cost.
Open the calculatorCost per kilometer
Bills for a period, divided by the distance you drove.
Open the calculator
Oil change due
Current kilometers, last oil change, and your interval.
Open the calculator
Service checklist
Common intervals from your current kilometers.
Open the checklistTire size
Compare two sizes, with diameter and speedometer change.
Open the calculatorEV charging cost
Charging cost per 100 km, compared with petrol.
Open the calculatorLPG conversion payback
Months and kilometers until a conversion pays off.
Open the calculator
Questions
Do I need an account to use these car maintenance tools?ShowHide
No. All the tools run in the browser: fuel economy, trip fuel cost, cost per kilometer, oil change due, and a car maintenance checklist. Nothing is saved when you leave.
Are the results an official car maintenance schedule?ShowHide
No. Fuel and trip cost are the arithmetic of the numbers you enter. The oil change due calculator and the service checklist use the interval or common gaps you choose, not your model's workshop schedule. Your handbook still wins.
How is this different from the RPMBase car maintenance app?ShowHide
These pages do one calculation. The app is the vehicle maintenance tracker: oil changes, invoices, fill-ups, and reminders stay attached to the car you own.
Which tool tells me when an oil change is due?ShowHide
Open oil change due. Enter today's odometer, kilometers at the last oil change, and your oil change interval. You get the next due kilometers. The checklist can also flag oil when you add months since the last change.
What is the car maintenance checklist for?ShowHide
It applies common intervals (oil, filters, brakes, coolant) to the kilometers you type. It is a prompt, not a VIN-specific car maintenance schedule. After you book the work, log it in RPMBase.
Can I use the oil change calculator in miles?ShowHide
Convert to kilometers once, then stay in one unit in your car maintenance log. Mixing units is how oil change due marks drift.
Do these tools replace a car maintenance log?ShowHide
No. A calculator forgets you when you close the tab. A lasting car maintenance log, oil change history, and reminders live in the RPMBase app.