Tire Size Calculator

This calculator can be used to determine the key specifications of a tire based on its size.

Tire Size (e.g., 235/45R17)

Section Width: - mm

Aspect Ratio: -

Sidewall Height: - mm

Diameter: - mm

Revolutions Per Mile: -

Diameter = (Section Width × Aspect Ratio / 100) × 2 + Wheel Diameter

Where:
Section Width: Width of the tire in mm
Aspect Ratio: Ratio of sidewall height to section width
Wheel Diameter: Diameter of the wheel in inches

Tire Size Calculator Calculator Usage Guide

Learn how to use the Tire Size Calculator calculator and its working principles

Enter the tire size in the format "Width/AspectRatioRWheelDiameter". For example, "235/45R17".
Click the "Calculate" button to compute the tire specifications.
The calculator will display the Section Width, Aspect Ratio, Sidewall Height, Diameter, and Revolutions Per Mile.

The tire size is represented as "Width/AspectRatioRWheelDiameter".

Width: The width of the tire in millimeters from one sidewall to the other.
Aspect Ratio: The ratio of the tire's cross-sectional height to its width. expressed as a percentage.
Wheel Diameter: The diameter of the wheel that the tire is mounted on, in inches.

For a tire size "235/45R17":