Tire Size Chart: Metric to Inches (Printable)
| Size | Rim | Diameter | Width | Sidewall | Revs per mile | Nearest flotation size |
|---|---|---|---|---|---|---|
| 235/75R15 | 15 in | 28.9 in | 9.3 in | 6.9 in | 698 | 29x9.50R15 |
| 31x10.50R15 | 15 in | 31.0 in | 10.5 in | 8.0 in | 651 | Already flotation |
| 33x12.50R15 | 15 in | 33.0 in | 12.5 in | 9.0 in | 611 | Already flotation |
| 245/75R16 | 16 in | 30.5 in | 9.6 in | 7.2 in | 662 | 30x9.50R16 |
| 265/75R16 | 16 in | 31.6 in | 10.4 in | 7.8 in | 637 | 32x10.50R16 |
| 285/75R16 | 16 in | 32.8 in | 11.2 in | 8.4 in | 614 | 33x11.00R16 |
| 315/75R16 | 16 in | 34.6 in | 12.4 in | 9.3 in | 583 | 35x12.50R16 |
| 265/65R17 | 17 in | 30.6 in | 10.4 in | 6.8 in | 660 | 31x10.50R17 |
| 245/75R17 | 17 in | 31.5 in | 9.6 in | 7.2 in | 641 | 31x9.50R17 |
| 265/70R17 | 17 in | 31.6 in | 10.4 in | 7.3 in | 638 | 32x10.50R17 |
| 255/75R17 | 17 in | 32.1 in | 10.0 in | 7.5 in | 629 | 32x10.00R17 |
| 285/70R17 | 17 in | 32.7 in | 11.2 in | 7.9 in | 617 | 33x11.00R17 |
| 33x12.50R17 | 17 in | 33.0 in | 12.5 in | 8.0 in | 611 | Already flotation |
| 295/70R17 | 17 in | 33.3 in | 11.6 in | 8.1 in | 606 | 33x11.50R17 |
| 315/70R17 | 17 in | 34.4 in | 12.4 in | 8.7 in | 587 | 34x12.50R17 |
| 35x12.50R17 | 17 in | 35.0 in | 12.5 in | 9.0 in | 576 | Already flotation |
| 37x12.50R17 | 17 in | 37.0 in | 12.5 in | 10.0 in | 545 | Already flotation |
| 265/60R18 | 18 in | 30.5 in | 10.4 in | 6.3 in | 661 | 31x10.50R18 |
| 265/65R18 | 18 in | 31.6 in | 10.4 in | 6.8 in | 639 | 32x10.50R18 |
| 275/65R18 | 18 in | 32.1 in | 10.8 in | 7.0 in | 629 | 32x11.00R18 |
| 285/65R18 | 18 in | 32.6 in | 11.2 in | 7.3 in | 619 | 33x11.00R18 |
| 33x12.50R18 | 18 in | 33.0 in | 12.5 in | 7.5 in | 611 | Already flotation |
| 275/70R18 | 18 in | 33.2 in | 10.8 in | 7.6 in | 608 | 33x11.00R18 |
| 35x12.50R18 | 18 in | 35.0 in | 12.5 in | 8.5 in | 576 | Already flotation |
| 285/55R20 | 20 in | 32.3 in | 11.2 in | 6.2 in | 624 | 32x11.00R20 |
| 275/60R20 | 20 in | 33.0 in | 10.8 in | 6.5 in | 611 | 33x11.00R20 |
| 33x12.50R20 | 20 in | 33.0 in | 12.5 in | 6.5 in | 611 | Already flotation |
| 305/55R20 | 20 in | 33.2 in | 12.0 in | 6.6 in | 607 | 33x12.00R20 |
| 275/65R20 | 20 in | 34.1 in | 10.8 in | 7.0 in | 592 | 34x11.00R20 |
| 35x12.50R20 | 20 in | 35.0 in | 12.5 in | 7.5 in | 576 | Already flotation |
| 37x13.50R20 | 20 in | 37.0 in | 13.5 in | 8.5 in | 545 | Already flotation |
Nominal sizes from the formulas. Real tires differ by maker and tread; the maker's spec sheet lists the actual diameter.
How to read the chart
Reading a row: 285/70R17 is 32.7 in tall and 11.2 in wide with a 7.9 in sidewall, and its nearest flotation size is 33x11.00R17. 285/70R17 and 33x12.50R17 are both about 33 in tall, so they are close in gearing and speedometer terms even though the codes look nothing alike.
How to use this tool
- Pick your rim
Use the rim buttons to show only the sizes that fit your wheel diameter. - Find your size
Look for the code on your tire's sidewall, or find the diameter you are aiming for in the Diameter column. - Print or share
Use Print this chart for a paper copy, or copy the page link from the box below.
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How it is calculated
- Sidewall (mm) = width x aspect / 100. Diameter (in) = rim + 2 x sidewall / 25.4. Section width (in) = width / 25.4.
- Diameter = first number. Width = second number. Sidewall (in) = (diameter - rim) / 2.
- Circumference = pi x diameter. Revolutions per mile = 63,360 / circumference.
Results are nominal. Real tires differ by maker and tread, and the maker's spec sheet lists the actual diameter.
Frequently asked questions
How do I convert a metric tire size to inches?
Multiply width by aspect ratio and divide by 100 for the sidewall in mm, divide by 25.4 for inches, double it and add the rim diameter. The chart does this for each size.
What is the nearest flotation size column?
It rounds the diameter to the nearest whole inch and the width to the nearest half inch. It is only a way to compare sizes, not a promise that a tire is sold in that size.
Why do very different size codes come out the same height?
Diameter depends on width x aspect ratio and on the rim together. 285/75R16 (about 32.8 in) and 285/70R17 (about 32.7 in) are nearly the same height even though the codes differ, which is why the chart lists the diameter next to every code.
Are these the exact tire diameters?
No. They are nominal figures from the size code. Tread depth, maker and mounted rim width all change the real number, and the maker's spec sheet lists it.
Which sizes are not on the chart?
The chart covers 31 common off-road sizes. For any other size, use the tire size calculator, which accepts any metric or flotation code.
What do the letters P and LT change?
They describe how the tire is built and rated, not its size math. The chart treats them the same.
Link to this tool
Your numbers are saved in the link, so anyone who opens it sees the same result.
Sources
Last checked 2026-11-12. Each link was opened and read on that date.
- BFGoodrich: How to read a tire sidewall: Size code: width in millimeters, aspect ratio, R for radial, rim diameter, P and LT prefixes.
- BFGoodrich: Changing tire size on a car: A different overall diameter changes speedometer and odometer accuracy.
This guide reflects independent editorial research, not first-hand product testing, professional mechanical training, or rescue certification. Some links on this page are Amazon Associates affiliate links; see our affiliate disclosure.