Metric / Inch Tire Size Converter

Enter your tire size information into one side of the tire size converter below to convert metric tire sizes to inches or inch tire sizes to their metric equivalents.

Metric Tire Size

/ R
(Example: 315 / 75 R 16)

Inch Tire Size

x -
(Example: 35 x 12.50 - 16)




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Metric and Inch Tires Sizes

While standard SAE tire sizes are easy to understand (a 35x12.50-16 tire runs 35 inches tall by 12.5 inches wide for a 16 inch wheel), many popular tires, particularly those under 35" tall, use harder to visualize metric dimensions (a 315/75R16 tire is 315 mm wide with a sidewall height that is 75% of the width for a 16 inch wheel). Converting a metric tire to inches can be done with the equation below, however, the above calculator is much easier!

[315] / [75] R [16] = [ (Tire Width x Aspect Ratio x 2) / 2550 + Wheel Diameter ] x [ Tire Width / 25.4 ] - [ Wheel Diameter ] = [35] x [12.4] - [16]



Popular Tire Size Equivalents

Metric Tire Size

Conversion

Inch Equivalent

255 / 85 R 16
=
33 x 10.04-16
=
33 x 10.0 - 16
305 / 70 R 16
=
33 x 12.01-16
=
33 x 12.0 - 16
305 / 65 R 17
=
33 x 12.01-17
=
33 x 12.0 - 17
305 / 55 R 20
=
33 x 12.01-20
=
33 x 12.0 - 20
325 / 50 R 20
=
33 x 12.80-17
=
33 x 12.5 - 20
285 / 75 R 17
=
34 x 11.22-17
=
34 x 11.5 - 17

Metric Tire Size

Conversion

Inch Equivalent

275 / 65 R 20
=
34 x 10.83-20
=
33 x 11.0 - 20
315 / 75 R 16
=
35 x 12.40-16
=
35 x 12.5 - 16
315 / 60 R 20
=
35 x 12.40-20
=
35 x 12.5 - 20
325 / 80 R 16
=
36 x 12.80-16
=
37 x 12.5 - 16
355 / 80 R 16
=
38 x 13.98-16
=
38 x 14.0 - 16
345 / 85 R 16
=
39 x 13.58-16
=
40 x 13.5 - 16



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