Tire Size Calculator: Metric to Inches
Tire size conversion from metric to inches is crucial for ensuring the right fit and performance of your vehicle’s tires. This calculator simplifies the process, helping you make informed decisions.
- Enter the tire’s width in millimeters.
- Enter the aspect ratio as a percentage.
- Enter the tire’s diameter in inches.
- Click ‘Calculate’.
The calculation uses the formula: Inch Size = (Width + (Aspect Ratio * 25.4) + (Diameter * 25.4)) / 25.4
| Metric Size | Inch Size |
|---|---|
| 205/55R16 | 24.7 |
| 225/45R17 | 25.3 |
- Always check your vehicle’s recommended tire size.
- Consider the load index and speed rating when choosing tires.
What is the aspect ratio?
The aspect ratio is the ratio of the tire’s width to its height, expressed as a percentage.