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Horsepower Calculator | Convert Watts, Torque & RPM to HP

Calculate horsepower from watts, convert between different horsepower units, or determine horsepower from torque and RPM with our free online calculator.

Category: Calculator

Horsepower Calculator

Convert between watts and horsepower, or calculate horsepower from torque and RPM. This calculator offers multiple ways to determine engine or motor power.

Horsepower Conversion Factors

  • 1 mechanical horsepower (hp) = 745.7 watts = 0.7457 kilowatts
  • 1 metric horsepower (PS/CV) = 735.5 watts = 0.7355 kilowatts
  • 1 electrical horsepower = 746 watts = 0.746 kilowatts
  • Horsepower from torque (lb-ft) and RPM: HP = (Torque × RPM) ÷ 5252
  • Horsepower from torque (Nm) and RPM: HP = (Torque × RPM) ÷ 7121