Tire Size Calculator

Go beyond size alone. Model all four tires and wheels, including rotational inertia, as an estimated equivalent vehicle-weight range during acceleration.

GO BEYOND SIZE: ROTATING WEIGHT

Wheel and tire weight is rotating, unsprung mass—not just another number on a scale. Enter each tire and wheel weight plus vehicle weight, peak torque and 0–60 time.

The app models the total mass change and rotational inertia of all four assemblies, then displays an estimated equivalent vehicle-weight range during acceleration. Enthusiasts can compare lightweight setups quantitatively; first-time buyers can see why reducing a few pounds at each wheel may matter more than the scale alone suggests.

One-time purchase. No ads, subscriptions or data collection.

Compare stock and upgrade tire sizes before you buy. Enter each tire's width, aspect ratio, rim diameter, load index, speed rating, and tire or wheel weight to see how the change affects fit and driving measurements.

COMPARE THE NUMBERS

• Overall diameter and circumference • Section width and sidewall height • Suitable rim-width range • Actual vehicle speed at 60 and 100 • Load index and speed rating • Tire and wheel weight, plus the modeled equivalent vehicle-weight range

FIND COMPATIBLE SIZES

Set allowable changes for rim diameter, section width, and circumference. The app generates recommended alternatives you can select and compare instantly.

SEE THE DIFFERENCE

Use scaled tire diagrams in side-by-side or half-circle mode to understand how two setups differ visually.

YOUR PREFERRED UNITS

Switch between imperial and metric measurements at any time.

A practical calculator for tire replacement, plus sizing, wheel upgrades, and fitment planning.

Always confirm final tire and wheel compatibility with your vehicle manufacturer or a qualified tire professional before purchasing or installing equipment.