Torque and Power Calculator
Calculate torque, power, and speed relationships in rotating machinery
About this calculator
The Torque and Power Calculator helps engineers, mechanics, and technicians determine the relationships between torque, power, and rotational speed in rotating machinery. This tool is essential for motor selection, drivetrain design, and performance analysis of engines, turbines, pumps, and other rotating equipment. By calculating these interdependent variables, users can optimize system efficiency, ensure proper component sizing, and troubleshoot mechanical power transmission issues in industrial and automotive applications.
How to use
Enter any two known values from torque (in lb-ft or Nm), power (in horsepower or watts), and rotational speed (in RPM). The calculator will automatically compute the missing third value using the fundamental power equation. Select your preferred units and click calculate to get instant results for your rotating machinery analysis.
Frequently asked questions
What's the relationship between torque, power, and RPM?
Power equals torque multiplied by angular velocity. The formula is: Power = (Torque × RPM) ÷ 5252 for horsepower units, or P = T × ω for metric units.
Can I use different unit systems with this calculator?
Yes, the calculator supports both imperial units (lb-ft, horsepower, RPM) and metric units (Nm, watts, RPM) with automatic conversions between systems.
What applications use torque and power calculations?
Common applications include motor sizing, engine performance analysis, gear ratio selection, pump and fan design, and drivetrain optimization in automotive and industrial systems.