What you get
Calculate a tyre’s theoretical outside diameter and circumference from width, aspect ratio and rim size.
How to use it
Enter only the requested values and check the unit shown beside each field. The main result gives the figure to use first. Details explain conversions, secondary quantities and rounding. Change any value to compare another situation without starting again.
Before using the result
Use actual vehicle data and current prices. Consumption, traffic, temperature, wear and charging conditions can make the real result differ from the estimate.