TireGeoCalcTire and Wheel Tools
Calculate nominal tire geometry and compare wheel positions. Choose a tool below; read its formulas and limitations before using the results.
- Tire size comparison calculator
- Speedometer Error Calculator — Estimate actual speed after changing tire size.
- Tire Revolutions per Mile Calculator — Calculate nominal circumference and revolutions per mile.
- Effective Gear Ratio Calculator — Compare effective gearing and an equivalent axle ratio after a tire change.
- Metric and Inch Tire Size Converter — Convert nominal metric and flotation tire dimensions.
- Wheel Offset and Backspacing Calculator — Compare inner and outer wheel position from width and offset.
- Rim Width Range Calculator — Estimate an approximate rim width range for a tire size.
- Tire Age Calculator from the DOT Code — Calculate tire age from the last four digits of the DOT code.
- Tire Cost per Mile Calculator — Divide the price of a set of tires by the miles you expect from it.
- Odometer Correction Calculator — Estimate the real miles driven after a tire size change.
- Ground Clearance Change Calculator — Estimate how much a new tire size raises or lowers the axle.
- Tire size alternatives
- Used tire check
- Tire size by vehicle — factory tire sizes by trim for 30 popular models