Tire Size Calculator

Enter Tire Size

Enter your tire dimensions to calculate specifications.

Understanding Tire Sizes

Tire sizes are typically expressed in one of two formats:

Metric Format (P-Metric or Euro-Metric)

Example: 225/65R17

  • 225Section width in millimeters
  • 65Aspect ratio (height as percentage of width)
  • RRadial construction
  • 17Wheel diameter in inches

Flotation or Inch Format

Example: 31x10.5R15

  • 31Overall diameter in inches
  • 10.5Section width in inches
  • RRadial construction
  • 15Wheel diameter in inches

This calculator helps you convert between these formats and calculate important dimensions like overall diameter, circumference, and revolutions per mile.