Tire size calculator
Parse tire sizes like 205/55 R16, compare two sizes, and see diameter, width, circumference, and ride-height change.
Tire size A
Tire size B
Size A
205/55 R16
631.9 mm
Size B
215/55 R17
668.3 mm
Result
Diameter A: 631.9 mm
Diameter B: 668.3 mm
Width A: 205 mm
Circumference A: 1985.17 mm
Diameter difference: 5.76%
Ride height change: 18.2 mm
How to use
1. Enter original and new tire size strings.
2. Compare visual diameters and read specs.
3. Check percent diameter difference and height change.
Example
Tire size calculator
Parse tire sizes like 205/55 R16, compare two sizes, and see diameter, width, circumference, and ride-height change.
When to use
• When you need a quick estimate without spreadsheets.
• When you want privacy — calculations stay on your device.
Limitations
• When you need certified engineering or legal calculations.
• When site-specific conditions require a professional survey.
About this calculator
Parse tire sizes like 205/55 R16, compare two sizes, and see diameter, width, circumference, and ride-height change.
Frequently asked questions
Is my data uploaded?
No. All math runs locally in your browser.
Is this tool free?
Yes. No account or subscription required.