Tire Size Calculator
Enter a tire size to calculate its dimensions. Accepts formats like 225/65R17, 225-65-17, or 225 65 17.
How it works
The tire size calculator uses these formulas:
- Sidewall height (mm) = Width (mm) × Aspect Ratio / 100
- Overall diameter (in) = (Wheel diameter × 25.4) + 2 × Sidewall height / 25.4
- Circumference (in) = Overall diameter × π
- Revolutions per mile = 63,360 / Circumference
Results are estimates based on nominal dimensions. Actual tire dimensions vary by brand, model, and wear. Use these numbers as a reference only.