Calculate tire dimensions in a few simple steps.
Input the tire width in millimeters (e.g., 225).
Input the aspect ratio as a percentage (e.g., 65).
Input the wheel diameter in inches (e.g., 17).
Review calculated tire diameter, circumference, and other dimensions.
In 225/65R17: 225 is width in mm, 65 is aspect ratio (sidewall height as % of width), R means radial, and 17 is wheel diameter in inches.
Tire circumference determines how far your vehicle travels with each tire rotation. It's essential for accurate speedometer calibration and odometer readings.
Revolutions per mile/km helps understand tire performance and is used in speedometer calibration. It varies based on tire size, affecting your vehicle's actual speed vs displayed speed.
Calculate tire dimensions, diameter, circumference, and revolutions per mile/km from tire size specifications.
The Tire Size Calculator helps you understand tire specifications by calculating key dimensions from width, aspect ratio, and wheel diameter. Get tire diameter, circumference, section height, and revolutions per mile/kilometer for any tire size.
Calculate tire dimensions in a few simple steps.