Gear Ratio RPM Calculator

Calculate output rotational speed (RPM) based on input speed and gear ratios.

Speed & Gears

Input RPM (Driving)

Driving Gear Teeth

Driven Gear Teeth

Calculation Results

Enter parameters to calculate RPM

About this calculator

Overview

This calculator determines the output rotational speed (RPM) of a gear system when you know the input speed and the number of teeth on both gears.

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Pro Tips

Fun Facts

"Modern high-speed electric motors can exceed 20,000 RPM, requiring precise gear reduction."
"A typical car engine idles around 600-1,000 RPM and 'redlines' around 6,000-8,000 RPM."
"The large hand on a clock has a rotational speed of 1 rotation per hour (0.016 RPM)."

Formula: Output RPM = (Input RPM × Driving Teeth) / Driven Teeth