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Gear Ratio Calculator

Enter the teeth count of the driver and driven gears to find the ratio, drive type, and output RPM.

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. Use the Share button to copy a link to your result.

About this calculator

This calculator finds the gear ratio between a driving gear and a driven gear from their tooth counts (ratio = driven teeth ÷ driver teeth), then tells you whether the pair produces a speed reduction or an overdrive, and what output RPM results from a given input speed.

Mechanical engineers and machinists use it when designing gearboxes, bicycle drivetrains, or automotive transmissions, since the tooth-count ratio directly determines both the speed and torque trade-off at the output shaft — more reduction means more torque but less speed, and vice versa.

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