Tire Size Calculator & Wheels

Compare tire and wheel sizes before you buy or install a new setup.

Tire Size Calculator & Wheels helps you compare your current tire with a new tire size and understand exactly what changes. Check overall diameter, width, sidewall height, circumference, ground clearance, revolutions and speedometer difference in seconds.

TIRE SIZE CALCULATOR

Enter two tire sizes such as 205/55R16 and 225/45R17 to see a clear side-by-side tire comparison.

See:
• Overall tire diameter
• Tire width
• Sidewall height
• Circumference
• Diameter difference %
• Ground clearance change
• Revolutions per mile or kilometer

Use metric or imperial units and quickly swap the current and new tire sizes.

SPEEDOMETER CALCULATOR

Changing tire diameter can change the relationship between indicated and actual vehicle speed.

Choose a speed or enter your own value to calculate:
• Indicated speed
• Estimated actual speed
• Speed difference
• Multi-speed comparison table

Useful when checking larger or smaller replacement tires and wheel upgrades.

WHEEL SIZE & OFFSET CALCULATOR

Compare two wheel setups using wheel diameter, rim width and offset (ET).

See how the new wheel changes:
• Outer position / poke
• Inner position / clearance
• Wheel width
• Offset
• Effective offset with spacers

The visual wheel comparison makes it easier to understand how width and offset affect wheel position.

FIND ALTERNATIVE TIRE SIZES

Enter your current tire size and find mathematically similar alternatives based on overall diameter.

Filter alternative tire sizes by:
• Maximum diameter difference
• Same or different rim diameter
• Wider or narrower tire
• Plus sizing options

Results are sorted by the closest diameter match, making it easier to compare replacement tire sizes.

VISUAL TIRE COMPARISON

See current and new tire dimensions visually with side and front views. Quickly understand changes in diameter, sidewall and width instead of relying only on numbers.

SAVE YOUR SETUPS

Save useful tire and wheel comparisons for later.

Perfect for:
• Summer and winter tire setups
• Replacement tires
• New wheels and rims
• Plus sizing
• Comparing tire options before purchase

You can also copy or share comparison results.

METRIC & IMPERIAL

Switch between millimeters and inches, kilometers and miles, and km/h and mph.

WORKS OFFLINE

Core tire size, wheel offset and speedometer calculations work offline. No account is required for the calculator.

USEFUL FOR DRIVERS & CAR ENTHUSIASTS

Whether you are replacing worn tires, changing wheel size, comparing aftermarket wheels or checking a new tire size before purchase, the app gives you the measurements you need in one place.

Common tools included:
• Tire size calculator
• Tire comparison calculator
• Wheel size calculator
• Wheel offset calculator
• Speedometer calculator
• Tire size converter
• Alternative tire size finder
• Wheel spacer calculator

IMPORTANT

Results are mathematical estimates for comparison purposes. Similar tire diameter or wheel position does not guarantee vehicle fitment. Actual compatibility can depend on your vehicle, suspension, brakes, wheel wells, load rating, speed rating and manufacturer specifications. Always verify fitment before purchasing or installing tires or wheels.