Tire size converter: inch ↔ metric
Off-road and light-truck tires are often sold in inches (35x12.50R17) while the door placard speaks metric (285/70R17). Enter either one to see the dimensions and the closest sizes in the other system.
33x12.50R17 is 33.00 in tall and 12.50 in (318 mm) wide on a 17-inch rim. Closest metric sizes on the same rim:
| Size | Diameter | Width | vs original |
|---|---|---|---|
| 315/65R17 | 33.12 in | 12.40 in | +0.37% |
| 335/60R17 | 32.83 in | 13.19 in | −0.52% |
| 295/70R17 | 33.26 in | 11.61 in | +0.79% |
| 345/60R17 | 33.30 in | 13.58 in | +0.91% |
| 285/70R17 | 32.71 in | 11.22 in | −0.88% |
| 305/65R17 | 32.61 in | 12.01 in | −1.18% |
| 325/65R17 | 33.63 in | 12.80 in | +1.92% |
| 325/60R17 | 32.35 in | 12.80 in | −1.96% |
| 355/55R17 | 32.37 in | 13.98 in | −1.90% |
| 305/70R17 | 33.81 in | 12.01 in | +2.46% |
Computed combinations of standard widths and aspect ratios; not every size is manufactured. A similar diameter does not mean a size fits or is approved for your vehicle.
Common inch sizes and their closest metric equivalents
| Inch size | Diameter | Closest metric sizes (same wheel) |
|---|---|---|
| 31x10.50R15 | 31.00 in | 255/80R15 (+0.2%), 275/75R15 (+0.8%), 295/70R15 (+0.8%) |
| 33x12.50R15 | 33.00 in | 305/75R15 (±0.0%), 325/70R15 (−0.3%), 285/80R15 (−0.1%) |
| 33x12.50R17 | 33.00 in | 315/65R17 (+0.4%), 335/60R17 (−0.5%), 295/70R17 (+0.8%) |
| 33x12.50R20 | 33.00 in | 325/50R20 (−0.6%), 335/50R20 (+0.6%), 305/55R20 (+0.6%) |
| 35x12.50R17 | 35.00 in | 305/75R17 (±0.0%), 325/70R17 (−0.2%), 285/80R17 (−0.1%) |
| 35x12.50R20 | 35.00 in | 315/60R20 (−0.3%), 345/55R20 (−0.2%), 295/65R20 (+0.3%) |
| 37x12.50R17 | 37.00 in | 315/80R17 (−0.4%), 335/75R17 (−0.6%), 295/85R17 (−0.7%) |
Equivalents are computed from nominal dimensions and limited to widths within ±40 mm of the inch size; not every size is manufactured, and a similar diameter does not mean a size fits or is approved for your vehicle.
Frequently asked questions
What is a 33 inch tire in metric?
It depends on the wheel. Metric sizes whose nominal diameter is within about half an inch of 33 in include 285/70R17 (32.71 in), 275/70R18 (33.16 in) and 285/60R20 (33.46 in); 285/75R17 is 33.83 in. Use the converter with your exact rim size.
How tall is 285/70R17 compared with 33 inches?
Nominally it is 32.71 in tall and 11.22 in wide — about 0.29 in shorter than a nominal 33x12.50R17 (roughly 32.5x11.00R17 in inch terms).
Why are inch sizes and metric sizes not exactly equal?
Metric widths come in 10 mm steps and aspect ratios in 5-point steps, so there is rarely a metric size that matches an inch size exactly. The converter shows the closest options and the percentage difference.
What does the 12.50 mean in 33x12.50R20?
The nominal section width in inches (12.50 in ≈ 318 mm). The first number is the overall diameter in inches and the last is the wheel diameter.
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