Metric-to-Inch Tire Converter
Turn a metric size into inches. Use the calculator below. Results update as you type.
How the Metric-to-Inch Tire Converter Works
The Metric to Inch Tire Converter works by converting the metric size into overall diameter, section width and rim, all in inches, and writing them in flotation style. A 265/70R17 becomes 31.6x10.4R17.
- Enter the metric size, for example 285/70R17.
- Read the diameter: 32.7 in.
- Read the width: 11.2 in.
- Read the inch equivalent: 32.7x11.2R17.
The output is a nominal comparison label. It is not a marking that appears on a real tire.
The Formula
The Metric to Inch Tire Converter formula converts each dimension with the 25.4 mm-per-inch factor.
Diameter (in) = Rim + 2 × (Width × Aspect Ratio ÷ 100) ÷ 25.4 Width (in) = Width (mm) ÷ 25.4 Inch Equivalent = Diameter × Width R RimWorked example for 295/70R18: sidewall is 206.5 mm (8.13 in), diameter is 18 + 16.26 = 34.26 in, width is 11.61 in, and the inch equivalent is 34.3x11.6R18.
Conversion Table
The Metric to Inch Tire Converter conversion table converts 12 truck and SUV sizes into inch equivalents. The list runs from 235/75R15 (28.9x9.3R15) to 325/60R20 (35.4x12.8R20).
Use the table to translate a "33 inch" or "35 inch" target into metric sizes. The 275/70R18 and 305/55R20 both land at 33.2 in, which makes them metric alternatives to a 33 in flotation tire.
| Metric Size | Diameter (in) | Width (in) | Rim (in) | Inch Equivalent |
|---|---|---|---|---|
| 235/75R15 | 28.9 | 9.3 | 15 | 28.9x9.3R15 |
| 245/75R16 | 30.5 | 9.6 | 16 | 30.5x9.6R16 |
| 265/70R16 | 30.6 | 10.4 | 16 | 30.6x10.4R16 |
| 265/70R17 | 31.6 | 10.4 | 17 | 31.6x10.4R17 |
| 275/70R18 | 33.2 | 10.8 | 18 | 33.2x10.8R18 |
| 285/70R17 | 32.7 | 11.2 | 17 | 32.7x11.2R17 |
| 285/75R16 | 32.8 | 11.2 | 16 | 32.8x11.2R16 |
| 295/70R18 | 34.3 | 11.6 | 18 | 34.3x11.6R18 |
| 315/70R17 | 34.4 | 12.4 | 17 | 34.4x12.4R17 |
| 305/55R20 | 33.2 | 12.0 | 20 | 33.2x12.0R20 |
| 325/60R20 | 35.4 | 12.8 | 20 | 35.4x12.8R20 |
| 275/65R20 | 34.1 | 10.8 | 20 | 34.1x10.8R20 |
What Is the Metric-to-Inch Tire Converter?
The Metric to Inch Tire Converter is a tool that rewrites a metric tire size in the inch format used for flotation and off-road tires. Many truck owners describe tires by height in inches, while most factory tires carry metric sizes.
The converter bridges the 2 systems. It shows that a factory 265/70R17 is a 31.6 in tire and that a 285/75R16 is a 32.8 in tire. These numbers are the starting point for lift and clearance planning.
Common Uses
The Metric to Inch Tire Converter has 4 uses: height shopping, forum comparisons, lift planning and clearance checks.
- Shop by height: Find metric sizes that match a 33 in or 35 in target.
- Compare forum builds: Translate builds listed in inches into metric sizes.
- Plan lifts: Match the tire's inch height to lift-kit guidance.
- Check clearance: Compare the inch width with available wheel-well space.