Automotive · Free tool
Tire Size Converter
Parse metric tire size (225/65R17) into overall diameter, width, circumference, and imperial equivalent.
Updated April 2026
Equivalent imperial size
28.5 x 8.9 R17
Parsed: 225 mm width / 65% aspect / 17" rim
Overall diameter
28.52 in
724 mm
Section width
8.86 in
225 mm
Circumference
89.58 in
7.47 ft
Revolutions per mile
707
63,360 in ÷ circumference
Reading a tire sidewall
In 225/65R17: 225 is the section width in mm, 65 is the aspect ratio (sidewall height as % of width), R means radial construction, and 17 is the rim diameter in inches. Replacement tires should match overall diameter within ~3% to keep speedometer & ABS calibration correct.Found this useful?Email
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What it does
Decode metric tire notation: width, aspect ratio, rim size — output overall diameter, section width, revs per mile, and imperial equivalent.
Runs entirely in your browser — no upload, no account, no watermark. For more tools in this category see the full tools index.
Embed this tool on your siteShow snippetHide
Paste this snippet into any page. Loads on-demand (lazy), no tracking scripts, and sized to most dashboards. Replace the height to fit your layout.
<iframe src="https://freetoolarena.com/embed/tire-size-converter" width="100%" height="720" frameborder="0" loading="lazy" title="Tire Size Converter" style="border:1px solid #e2e8f0;border-radius:12px;max-width:720px;"></iframe>How to use it
- Enter tire size (e.g. 225/65R17).
- Read overall diameter + circumference.
- See imperial equivalent.
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