Calculate Your Overall Tire Diameter

Toyota Tire Care

Tire Size Calculator


To calculate overall tire diameter, you only need the size of the tire. The formula below will help you determine the tire diameter.

(Cross-Section width X 0.aspect ratio) X 2 / 25.4
Wheel Diameter
Overall tire diameter (in inches)

For example, if the tire size is 225/50R 16 the equation will be implemented as follows:

(225 X 0.50) X 2 / 25.4
24.85 inches