Tire & Wheel Calculators
Wheel & Offset Tools

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.

Inputs
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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

Offset (mm) = (backspacing(in) − nominal wheel width(in) ÷ 2) × 25.4.

Example

8 in nominal width and 5.38 in calculated backspacing ≈ ET35.

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.