Free Mechanical Engineering Tool

Gear Ratio Speed & Torque Calculator

Calculate gear ratio, output RPM, output torque, and center distance for spur gear pairs, multi-stage trains, and planetary gear sets.

Parameters

Gear Type

Input Speed (RPM)

Input Torque (Nm)

Efficiency (%)

Driver Teeth (z₁)

Driven Teeth (z₂)

Module (mm)

Gear Ratio

3.000:1

3.000:1 reduction

Output Speed

600.0 RPM

From 1800 RPM input

Output Torque

147.0 Nm

From 50 Nm input

Center Distance

80.0 mm

a = m(z₁+z₂)/2

Ratio = z₂/z₁. Output RPM = Input RPM / Ratio. Output Torque = Input Torque × Ratio × Efficiency. Center distance = m × (z₁ + z₂) / 2.

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