Online Tools and Calculator

Tyre Size Calculator

Diameter and circumference from a tyre size.

mm
%
inch

Result

Fill in the fields and tap Calculate to see your result.

How to use the Tyre Size Calculator

  1. Enter tyre width.
  2. Enter aspect ratio.
  3. Enter rim diameter.
  4. Tap Calculate to see the result.
  5. Tap Reset to clear the fields and try again.

Last updated: 1 November 2026

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