🚗 Tire Size Calculator
Calculate tire dimensions, compare different tire sizes, and get safety recommendations. Our calculator supports both metric and imperial units for accurate tire size analysis.
Tire Size Input
Tire Size
Format: Width/AspectRatio R RimDiameter
New Tire Size
Results
Enter tire size to see calculations
Understanding Tire Size Codes
Tire Size Format
A typical tire size like 225/65R17 contains:
- 225 - Tire width in millimeters
- 65 - Aspect ratio (sidewall height as % of width)
- R - Radial construction
- 17 - Rim diameter in inches
Calculation Formulas
- Sidewall Height = Width × Aspect Ratio ÷ 100
- Tire Diameter = Rim Diameter + 2 × Sidewall Height
- Circumference = π × Tire Diameter
- Revolutions per Mile = 63,360 ÷ Circumference
Frequently Asked Questions
⚠️ Disclaimer
This calculator is for informational purposes only and should not replace professional advice. Always consult with a qualified tire professional before making tire changes. Ensure any tire replacements comply with your vehicle manufacturer's specifications and local regulations. The developers are not responsible for any consequences resulting from the use of this tool.