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Tire Size Calculator

Calculate sidewall height, overall diameter, rolling circumference, and revolutions per km from a tire's width, aspect ratio, and rim size.

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. Use the Share button to copy a link to your result.

About this calculator

This calculator works out a tire's sidewall (aspect) height, overall diameter, rolling circumference, and revolutions per kilometer from its size code — the width, aspect ratio, and rim diameter printed on the sidewall (like 205/55R16) — using the standard formulas tire shops and enthusiasts use to translate that code into real dimensions.

Drivers considering a "plus-size" fitment (wider tires, smaller sidewalls) use it to keep the overall diameter close to stock so the speedometer stays accurate, and mechanics and tire shops use it to compare alternate sizes before recommending a swap.

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