Quick examples:
About This Calculator
This versatile tool intelligently parses common P-Metric (e.g., 225/45R17) and Flotation (e.g., 33x12.50R15) tire size strings and instantly flags which format it detected. Once analyzed, it calculates a full set of dimensions: overall diameter, section width, sidewall height, aspect ratio, rim diameter, circumference, and revolutions per mile/km: and headlines an approximate conversion to the alternative sizing system (P-Metric to Flotation or vice-versa). Tap one of the built-in quick-example chips to see a decoded size instantly, or paste your own tire size to decode it in seconds. Perfect for quickly understanding any tire size you encounter and seeing how it compares to another format, this calculator is your first stop for decoding complex tire markings.
Once a size is decoded, you can draw it next to another tire to scale, and the chart of 33, 35 and 37 inch tires in metric answers the common inch-to-metric questions without a lookup.
How to Use This Calculator
- Enter the full tire size string into the input field, or tap one of the quick-example chips to try a sample size instantly.
- Supported P-Metric format: Width(mm)/AspectRatio(%)R<RimDiameter>(in). Example: `225/45R17`.
- Supported Flotation format: OverallDiameter(in)xSectionWidth(in)R<RimDiameter>(in). Example: `33x12.50R15`.
- Click 'Analyze & Convert' (or press Enter) to decode the size.
- Review the detected-format badge, the headline converted size, and the full dimension breakdown, including aspect ratio, rim diameter, circumference, and revolutions per mile/km.
Disclaimer
All tools and information provided on TireCalculatorHub are for informational purposes only. Tire size conversions and calculations are approximate and can vary due to manufacturing tolerances and tire wear. Always verify actual tire dimensions with the manufacturer and consult with a qualified professional before making decisions about your vehicle's tires or modifications.
TireCalculatorHub is not liable for any damages or issues arising from the use of information or tools on this website.