Inches to Metric Tire Size Converter

Enter target inch dimensions to search common 5 mm width and 5-point aspect-ratio steps for a close theoretical metric size.

Target diameter (in)

Target width (in)

Wheel diameter (in)

—Nearby metric size

—Calculated diameter

—Calculated width

—Diameter difference

—Searches common 5 mm section-width and 5-point aspect-ratio increments. It is a size-math suggestion only, not a vehicle fitment recommendation.

How to use this Inches to Metric Tire Size Converter

Find a nearby standard metric tire size for target inch diameter, width, and rim diameter. Enter your values above and the result is calculated directly in your browser. No account is required.

Fast answer, clear inputs

This tool is built around one job: give the answer quickly without forcing a signup or hiding the result. Related tools are linked nearby when the next calculation or conversion is useful.