Engineering

Gear Ratio Calculator

Calculate gear ratios and mechanical advantage

Driver Gear Teeth*

Driven Gear Teeth*

Input RPM*

RPM

Input Torque (N·m)

N·m

Gear Ratio

20:60 = 1:3.00

Calculated gear ratio

Output RPM

500.00RPM

Driven gear rotational speed

Output Torque

30.0000N·m

Torque at driven gear (ignoring losses)

Gear Ratio = Driven Teeth / Driver Teeth
Output RPM = Input RPM / Gear Ratio
Output Torque = Input Torque × Gear Ratio

Supported inputs

Input	Description
Driver Gear Teeth	Number of teeth on the driver gear
Driven Gear Teeth	Number of teeth on the driven gear
Input RPM (RPM)	Rotational speed of the driving gear
Input Torque (N·m) (N·m)	Torque applied to the driving gear

Formula

Gear Ratio = Driven Teeth / Driver Teeth
Output RPM = Input RPM / Gear Ratio
Output Torque = Input Torque × Gear Ratio

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