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Gear Ratio Calculator

Inputs

Input RPM(RPM)

Rotations per minute of the driving gear or motor

Input Torque(N·m)

Torque applied to the driving gear

Driving Gear Teeth(teeth)

Number of teeth on the input or driving gear

Driven Gear Teeth(teeth)

Number of teeth on the output or driven gear

System Efficiency(%)

Overall efficiency of the gear system accounting for friction losses

Results

Gear Ratio

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Output RPM

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Rotational speed of the output or driven gear

Output Torque

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Torque delivered by the output or driven gear

Mechanical Advantage

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Input Power

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Output Power

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Formula

Gear Ratio (GR) = Driven Teeth / Driving Teeth | Output RPM = Input RPM / GR | Output Torque = Input Torque × GR × Efficiency | Mechanical Advantage = Output Torque / Input Torque