Compare the nominal geometry of two metric tire sizes. This does not approve a tire or wheel fit.
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Enter two sizes
What the numbers mean
The calculator uses nominal sidewall height (width × aspect ratio), wheel diameter and π to estimate overall diameter, circumference and speedometer difference. It does not measure a real tire or check rim width, clearance, load, speed, P/LT class, AWD tolerance or OEM approval.
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Before ordering tires
Read the driver-door tire placard. Match the installed wheel, axle, tire class, load index, speed rating and any OE marking. The size alone cannot approve a replacement SKU. Tire-sidewall maximum pressure is not your vehicle’s cold inflation pressure.
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