RPM Calculator — Free Online Tool
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RPM Calculator

Calculate engine revolutions per minute (RPM) based on speed and gearing

RPM Formula: $\text{Engine RPM} = \frac{\text{Speed (mph)} \times 336 \times \text{Gear Ratio} \times \text{Transmission Ratio}}{\text{Tire Diameter (in)}}$. Enter your vehicle details below.
Vehicle & Gearing Parameters Input

Calculation Results

⚠️ Transmission ratio is typically $1.0$ for direct drive (fourth or fifth gear), less than $1.0$ for overdrive gears, and higher for lower gears.

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