Gear Reducing Formulas

Output torque, speed and horsepower with gears.

Gear Reducing Formulas

Calculate output torque, speed, and horsepower for gear transmissions using the formulas below.

Calculator

Inputs

Results

Output Torque (Nm)-- Nm
Output Speed (rpm)-- rpm
Output Power (kW)-- kW

Formulas

Gear Output Torque: Mo = Mi × r × μ

Gear Output Speed: So = Si / r

Gear Output Horsepower: Po = Pi × μ

Where:

  • Mo = output torque (Nm)
  • Mi = input torque (Nm)
  • r = gear transmission ratio
  • μ = gear efficiency
  • So = output speed (rpm)
  • Si = input speed (rpm)
  • Po = output horsepower (W, hp)
  • Pi = input horsepower (W, hp)