Tire Size Converter
Enter a tire size like 205/55R16 to decode its actual dimensions.
100% client-side · no upload
Section Width
Sidewall Height
Overall Diameter
Diameter (inches)
Circumference
How to use
- Enter your tire size in the standard format: Width/AspectRatioR
RimDiameter (e.g. 205/55R16). - Click Decode Tire Size to see section width, sidewall height, overall diameter, and circumference.
- Use the results to compare replacement tires or check fitment compatibility.
Related car tools
- Fuel Economy Calculator — tire size affects rolling resistance and fuel economy
- MPG ↔ L/100km Converter — convert between fuel economy units
- Oil Change Cost Estimator — estimate maintenance costs
- Car Depreciation Estimator — understand total cost of ownership
常見問題
- Is this tire size converter free?
- Yes, completely free with no signup and no usage limits.
- Does my data leave my device?
- No. All calculations run in JavaScript inside your browser. Nothing is sent to any server.
- Does it work on mobile?
- Yes. The converter is mobile-first and works on iPhone Safari and Android Chrome.