HP Torque RPM Calculator

Calculate torque from horsepower and RPM, horsepower from torque, or RPM from known power and torque. Useful for motors, conveyors, robotics, reducers, and general mechanical design.

Open Calculator Gearbox Output Torque
Good starting use case: enter any two values — horsepower, torque, or RPM — and calculate the third. This is a quick way to estimate motor or drive requirements before deeper sizing work.
Calculator

Calculate Horsepower, Torque, or RPM

This calculator is commonly used for electric motors, engines, conveyors, robotics, pumps, and mechanical power transmission systems. Enter any two values to calculate the third.

Quick examples
Enter any two values and click Calculate.

Need help applying this to a real machine?

Get connected with a qualified automation integrator if you are sizing a drive, checking motor capability, or estimating real torque demand in a machine.

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Key Mechanical Power Formula

Torque (lb-ft) = (HP × 5252) / RPM

HP = (Torque × RPM) / 5252

RPM = (HP × 5252) / Torque

The constant 5252 comes from converting rotational power into horsepower units.

Example Torque Values

Horsepower RPM Torque (lb-ft)
1 HP17503.0
5 HP175015.0
10 HP175030.0
20 HP175060.0
50 HP1750150.0

Where this calculator helps

This page is useful when checking whether a motor has enough torque at a given speed, estimating power for a conveyor or gearbox, or comparing different drive options during concept work.

It is especially handy when someone gives you only two of the three values and you need the missing one quickly. After this, the next step is usually checking service factor, reducer ratio, startup loads, and real efficiency losses.

Gearbox Output Torque Gear Ratio Calculator Conveyor Motor Sizing Servo Torque Calculator
This horsepower torque calculator helps engineers estimate motor torque, mechanical power transmission, and drive system requirements.

What this calculator gives you

  • Torque from HP and RPM
  • Horsepower from torque and RPM
  • RPM from horsepower and torque
  • Quick motor power checks

Common uses

Useful for motors, conveyors, gear reducers, robotics, rotating tooling, pumps, and general mechanical design reviews.

Common next checks

  • Gear ratio or reducer selection
  • Service factor and overload margin
  • Startup and acceleration torque
  • Mechanical efficiency losses
  • Duty cycle and heat