Tire & Wheel Calculators
Tire / Wheel Calculators

Tire & Wheel Calculators

Geometry calculators for tire sizes, wheel offset, backspacing and speedometer differences.

🔒 Calculations run in your browser; entered tire and wheel values are not uploaded.
ⓘThese calculators compare nominal tire and wheel geometry. Actual fitment depends on the vehicle, wheel, tire model, suspension, brake clearance, load/speed ratings and local requirements. Verify final fitment before purchase or installation.

Popular tools

Tire Size Calculator

Tire Size Calculator. Decode, calculate and compare nominal tire dimensions. Calculations run in your browser; entered tire and wheel values are not uploaded.

Tire Size Comparison Calculator

Tire Size Comparison Calculator. Decode, calculate and compare nominal tire dimensions. Calculations run in your browser; entered tire and wheel values are not uploaded.

Speedometer Difference Calculator

Speedometer Difference Calculator. Decode, calculate and compare nominal tire dimensions. Calculations run in your browser; entered tire and wheel values are not uploaded.

Tire Revolutions per Mile / Kilometer

Tire Revolutions per Mile / Kilometer. Decode, calculate and compare nominal tire dimensions. Calculations run in your browser; entered tire and wheel values are not uploaded.

Wheel Offset Calculator

Wheel Offset Calculator. Calculate offset, backspacing and nominal wheel position. Calculations run in your browser; entered tire and wheel values are not uploaded.

Wheel Offset Comparison

Wheel Offset Comparison. Calculate offset, backspacing and nominal wheel position. Calculations run in your browser; entered tire and wheel values are not uploaded.

Wheel Backspacing Calculator

Wheel Backspacing Calculator. Calculate offset, backspacing and nominal wheel position. Calculations run in your browser; entered tire and wheel values are not uploaded.

Metric Tire Size Decoder

Metric Tire Size Decoder. Decode, calculate and compare nominal tire dimensions. Calculations run in your browser; entered tire and wheel values are not uploaded.

Plus Size Calculator

Plus Size Calculator. Decode, calculate and compare nominal tire dimensions. Calculations run in your browser; entered tire and wheel values are not uploaded.

Categories

Tire Size Tools

Decode, calculate and compare nominal tire dimensions.

Wheel & Offset Tools

Calculate offset, backspacing and nominal wheel position.

Popular Tire Sizes

Static reference pages for a curated set of common metric tire sizes.

Popular tire sizes

195/65R15634.5 mm · 24.98 in205/55R16631.9 mm · 24.88 in225/45R17634.3 mm · 24.97 in225/50R17656.8 mm · 25.86 in235/45R17643.3 mm · 25.33 in225/40R18637.2 mm · 25.09 in235/40R18645.2 mm · 25.40 in245/40R18653.2 mm · 25.72 in245/45R18677.7 mm · 26.68 in235/55R18715.7 mm · 28.18 in255/50R19737.6 mm · 29.04 in245/40R19678.6 mm · 26.72 in255/35R19661.1 mm · 26.03 in275/40R19702.6 mm · 27.66 in245/35R20679.5 mm · 26.75 in255/35R20686.5 mm · 27.03 in275/35R20700.5 mm · 27.58 in275/55R20810.5 mm · 31.91 in285/45R22815.3 mm · 32.10 in225/65R17724.3 mm · 28.52 in235/65R17737.3 mm · 29.03 in265/70R17802.8 mm · 31.61 in275/65R18814.7 mm · 32.07 in205/60R16652.4 mm · 25.69 in

All calculators

Tire Size Calculator

Tire Size Calculator. Decode, calculate and compare nominal tire dimensions. Calculations run in your browser; entered tire and wheel values are not uploaded.

Tire Size Comparison Calculator

Tire Size Comparison Calculator. Decode, calculate and compare nominal tire dimensions. Calculations run in your browser; entered tire and wheel values are not uploaded.

Tire Diameter Calculator

Tire Diameter Calculator. Decode, calculate and compare nominal tire dimensions. Calculations run in your browser; entered tire and wheel values are not uploaded.

Tire Circumference Calculator

Tire Circumference Calculator. Decode, calculate and compare nominal tire dimensions. Calculations run in your browser; entered tire and wheel values are not uploaded.

Tire Sidewall Height Calculator

Tire Sidewall Height Calculator. Decode, calculate and compare nominal tire dimensions. Calculations run in your browser; entered tire and wheel values are not uploaded.

Tire Revolutions per Mile / Kilometer

Tire Revolutions per Mile / Kilometer. Decode, calculate and compare nominal tire dimensions. Calculations run in your browser; entered tire and wheel values are not uploaded.

Speedometer Difference Calculator

Speedometer Difference Calculator. Decode, calculate and compare nominal tire dimensions. Calculations run in your browser; entered tire and wheel values are not uploaded.

Plus Size Calculator

Plus Size Calculator. Decode, calculate and compare nominal tire dimensions. Calculations run in your browser; entered tire and wheel values are not uploaded.

Wheel Offset Calculator

Wheel Offset Calculator. Calculate offset, backspacing and nominal wheel position. Calculations run in your browser; entered tire and wheel values are not uploaded.

Wheel Offset Comparison

Wheel Offset Comparison. Calculate offset, backspacing and nominal wheel position. Calculations run in your browser; entered tire and wheel values are not uploaded.

Wheel Backspacing Calculator

Wheel Backspacing Calculator. Calculate offset, backspacing and nominal wheel position. Calculations run in your browser; entered tire and wheel values are not uploaded.

Wheel Width / Position Calculator

Wheel Width / Position Calculator. Calculate offset, backspacing and nominal wheel position. Calculations run in your browser; entered tire and wheel values are not uploaded.

Metric Tire Size Decoder

Metric Tire Size Decoder. Decode, calculate and compare nominal tire dimensions. Calculations run in your browser; entered tire and wheel values are not uploaded.

Tire Size to Inches

Tire Size to Inches. Decode, calculate and compare nominal tire dimensions. Calculations run in your browser; entered tire and wheel values are not uploaded.

Tire Size to Millimeters

Tire Size to Millimeters. Decode, calculate and compare nominal tire dimensions. Calculations run in your browser; entered tire and wheel values are not uploaded.

Tire Aspect Ratio Calculator

Tire Aspect Ratio Calculator. Decode, calculate and compare nominal tire dimensions. Calculations run in your browser; entered tire and wheel values are not uploaded.