Tire Size Calculator — Free Online Tool
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Tire Size Calculator

Calculate overall tire diameter, sidewall height, and revolutions per mile

Tire Formula: $\text{Sidewall Height} = \frac{\text{Width} \times \text{Aspect Ratio}}{100}$. $\text{Diameter} = \text{Rim} + (2 \times \text{Sidewall})$. Enter your tire specs below.
Tire Specification Input

Calculation Results

⚠️ Changing overall tire diameter significantly can affect your vehicle's speedometer accuracy and gearing performance!

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