Tire Size Calculator
Compare tire diameter and circumference from tire size notation.
How to use this calculator
Enter the requested values, then select Calculate. Results are processed locally in your browser for this static website.
Accuracy notes
Results may be affected by rounding, unit conventions and the assumptions shown by the calculator. Verify important calculations independently.
What this calculator solves
Compare tire diameter and circumference from tire size notation. This page provides the interactive calculation together with a plain-language explanation so the result can be checked against the underlying method.
Science and formulae
For a tire such as 205/55R16, sidewall height = width × aspect ratio; overall diameter combines two sidewalls with wheel diameter.
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