Gear Reducing Formulas

Output torque, speed and horsepower with gears

Gear Output Torque

Mo = Mi r μ 


Mo = output torque (in. lb.- ft)

Mi = input torque (in. lb.- ft)

r = gear reducer ratio

μ = gear efficiency (%)

Gear Output Speed

So = Si  μ / r 


So = output speed (rpm)

Si = input speed (rpm)

Gear Output Horsepower

Po = Pi  μ 


Po = output horsepower (hp)

Pi = input horsepower (hp)

Related Topics

  • Mechanics - Forces, acceleration, displacement, vectors, motion, momentum, energy of objects and more

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