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