Inch to Metric Tire Calculator
Convert tire sizes between inch and metric measurements. Calculate tire diameter, width, sidewall height, circumference, and revolutions per mile.
Step 1: Input Tire Size
Understanding Tire Sizes
Metric format: 225/50R17 means 225mm width, 50% aspect ratio (sidewall height is 50% of width), and 17-inch rim. Inch format: 31×10.50R15 means 31-inch diameter, 10.5-inch width, and 15-inch rim.
Step 2: Calculation Options
Tire Size Impact
Changing tire size affects speedometer accuracy, acceleration, braking, fuel economy, and vehicle clearance. Always consult your vehicle manual before changing tire sizes.
Tire Size Conversion Results
Your Tire Size Conversion
Tire Size Comparison
| Tire Size | Diameter | Width | Sidewall | Circumference | Revs/Mile |
|---|
Detailed Tire Specifications
Tire Size Conversion Formulas
Metric to Inch: Overall Diameter (inches) = (Width × Aspect Ratio ÷ 1270) + Rim Diameter
Inch to Metric: Width (mm) = Width (inches) × 25.4
Aspect Ratio (%) = (Overall Diameter – Rim Diameter) × 50 ÷ Width (inches)
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