Tire Size Calculator

This Tire Size Calculator can be used to calculate various tire dimensions, aspect ratio, sidewall height, circumference, and revolutions per mile based on tire size.

Input Parameters

Calculation Results

Calculation Results

Aspect Ratio: -

Sidewall Height: - mm

Wheel Diameter: - mm

Circumference: - mm

Revolutions per Mile: -

Calculation Formula

Circumference = π * (Wheel Diameter + 2 * Sidewall Height)

Revolutions per Mile = 63360 / Circumference

Where:
π = 3.14159
Wheel Diameter = Wheel Size in inches * 25.4 mm
Sidewall Height = Aspect Ratio / 100 * Wheel Diameter

Tire Size Calculator Usage Guide

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

How to Use the Tire Size Calculator

  1. Enter the tire size in the format "Width/AspectRatio-RWheelDiameter". For example, "235/45R17" represents a tire with a width of 235 mm, an aspect ratio of 45%, and a 17-inch wheel diameter.
  2. Click the "Calculate" button to perform the calculations.
  3. The calculator will display the aspect ratio, sidewall height, wheel diameter, circumference, and revolutions per mile based on the input tire size.

Understanding the Results

  • Aspect Ratio: The ratio of the tire's cross-sectional width to its height. A lower number indicates a lower profile tire.
  • Sidewall Height: The height of the tire's sidewall in millimeters.
  • Wheel Diameter: The diameter of the wheel in millimeters.
  • Circumference: The distance around the tire in millimeters.
  • Revolutions per Mile: The number of times the tire rotates in one mile.

Example

For a tire size "235/45R17":

  • Aspect Ratio: 45
  • Sidewall Height: 202.45 mm
  • Wheel Diameter: 431.8 mm
  • Circumference: 1358.21 mm
  • Revolutions per Mile: 46.64