Power to Torque Calculator


About Power to Torque Calculator (Formula)

A Power to Torque Calculator is a useful tool in the field of engineering, mechanics, and automotive design that helps individuals convert between power (measured in watts) and torque (measured in newton-meters or foot-pounds). Power and torque are two fundamental concepts when it comes to understanding the performance of engines, motors, and machinery. The calculator enables users to make conversions easily and understand how power and torque are related.

The formula for converting power (P) to torque (T) involves incorporating the angular velocity (ω), which is usually given in radians per second (rad/s):

Torque (T) = Power (P) / Angular Velocity (ω)


  • Torque (T) is the twisting force measured in newton-meters (Nm) or foot-pounds (ft-lb).
  • Power (P) is the rate at which work is done, measured in watts (W) or horsepower (hp).
  • Angular Velocity (ω) is the rate of rotation in radians per second (rad/s).

For the sake of consistency, it’s essential to ensure that all units are compatible. If power is given in watts, angular velocity should be in radians per second, and if power is given in horsepower, angular velocity should be in revolutions per minute (RPM). In the latter case, an additional conversion is needed because 1 RPM is equal to approximately 0.1047 rad/s.

Here’s the formula with power in horsepower:

Torque (ft-lb) = (Power (hp) × 5252) / RPM

To use a Power to Torque Calculator effectively, users input the known values for power and angular velocity (or RPM), and the calculator provides the corresponding torque. This conversion is particularly valuable in various applications:

  1. Automotive Engineering: In the automotive industry, it helps engineers understand the relationship between an engine’s power output and its ability to produce torque at different RPMs, which is critical for vehicle performance.
  2. Industrial Machinery: For machinery and equipment designers, it aids in selecting the right motors and engines for specific tasks by considering power and torque requirements.
  3. Aerospace: In aviation and aerospace engineering, it helps in designing and optimizing aircraft propulsion systems.
  4. Mechanical Design: For mechanical engineers, it’s essential for designing machines, gear systems, and mechanisms where the relationship between power and torque matters.
  5. Performance Tuning: In motorsports and performance tuning, it assists in optimizing engine performance by understanding how changes in power affect torque and vice versa.
  6. Electric Motors: For electric vehicle manufacturers and electric motor design, it aids in matching the motor’s power output to the desired torque characteristics.

In summary, a Power to Torque Calculator is a versatile tool that simplifies the conversion between power and torque, making it easier for engineers, designers, and automotive enthusiasts to work with these critical parameters. Understanding this relationship is crucial for designing efficient and high-performing machinery and systems across various industries.