Tires & wheels calculators
Choose a tool, enter your numbers, and follow the calculation.
Wheel Offset Calculator
Compare wheel width and offset to estimate inner clearance and outward position changes, with a shared-scale diagram.
Tires & wheelsTire Size Calculator
Calculate nominal tire diameter, sidewall height, circumference, and revolutions per mile.
Tires & wheelsTire Size Comparison Calculator
Compare two tire sizes with a scale diagram, dimension table, and speedometer estimates in mph or km/h.
Tires & wheelsWheel RPM Calculator
Convert road speed to wheel RPM, or wheel RPM to speed, using tire revolutions per mile, revolutions per kilometer or rolling circumference.
Tires & wheelsRolling Resistance Calculator
Estimate tire rolling resistance force, mechanical power and energy per distance from loaded vehicle mass, speed and an entered rolling resistance coefficient.
Tires & wheelsStopping Distance Calculator
Estimate reaction distance, braking distance and total stopping distance from speed, reaction time and constant deceleration. Compare meters and feet.
Tires & wheelsOdometer Correction Calculator
Calculate a trip-distance correction factor from a measured reference route and your odometer reading. Estimate corrected trip miles or kilometers.
Tires & wheelsTire Tread Wear Rate Calculator
Calculate observed tire tread loss per 1,000 miles or kilometers from two depth readings. Compare measurement intervals with mm and 32nds-inch inputs.
Tires & wheelsTire Cost per Mile Calculator
Compare two tire sets by cost per mile or kilometer. Enter total costs and service distances to see cents per distance and an equal-cost distance for Set B.