Tire & Wheel Calculators
Tire Size Tools

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.

Inputs
{{/each}}
Calculations run in your browser; entered tire and wheel values are not uploaded.
ⓘCalculated dimensions are nominal values based on tire-size notation; actual measured dimensions vary. 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.

Formula & method

Compare a candidate replacement to the original nominal diameter using a user-selected tolerance.

Example

A result inside ±2% means geometrically close in overall nominal diameter, not guaranteed fitment.

Limitations

Calculated dimensions are nominal values based on tire-size notation; actual measured dimensions vary. 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.