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Tire Size Calculator
Convert tire sizes and compare tire dimensions. Calculate diameter, width, and sidewall height from tire size codes like 205/55R16.
Gallons Used
10 gal
Total Cost
$35.00
Cost Per Mile
$0.12
How to Use the Tire Size Calculator
Enter your values above for an instant result. This tool uses verified formulas and is optimised for users in USA, Canada, UK, Australia. All calculations happen in your browser — your data is never sent to our servers.
Frequently Asked Questions
What does the tire size 205/55R16 mean?
205 = width in mm, 55 = aspect ratio (sidewall is 55% of width), R = radial construction, 16 = wheel diameter in inches.