Horsepower Calculator

The Horsepower Calculator is a free online tool that calculates horsepower based on speed and torque. The horsepower calculator tool speeds up the process by displaying the horsepower in a fraction of a second.

Calculation method
Vehicle weight
Quarter mile time


Horsepower Calculator: Horsepower is a unit of power that represents the rate at which work is completed. This calculator can be used to calculate horsepower and convert between different power units according to its definition. Please use our Engine Horsepower Calculator to determine a vehicle's engine horsepower. This tool will help you to measure either horsepower or torque, depending on your option.

Various Horsepowers

When individuals use the phrase horsepower, they are most likely referring to mechanical horsepower. However, There are other less well-known definitions of the term.

  • hp(I) is mechanical horsepower, which is equal to 550 foot-pounds per second, or 745.7 watts. The mechanical horsepower invented by James Watt in 1782 is the most frequent definition of horsepower.
  • The metric horsepower (hp(M)) is 75 kgf-m per second, or 735.499 watts.
  • In Boiler Horsepower hp(S), 34.5 pounds of water evaporated every hour at 212 degrees Fahrenheit, or 9,809.5 watts. This term is most commonly used to describe a boiler's ability to supply steam to a steam engine.
  • 746 watts of electrical power This is a common definition for electrical machinery.

Watts - Definition

The International System of Units (SI) does not recognise horsepower; instead, the SI utilises a watt, which is named after James Watt, to measure power (the rate at which energy is generated or used). A watt is one joule per second, and it's commonly used to measure the rate of energy transmission for low-power applications like lightbulb or smartphone charging.

How to use the Horsepower Calculator?

The following is the procedure on the functionality of the horsepower calculator. They are as follows

  • Enter the value of speed, torque in the appropriate input fields.
  • To get the Horsepower, click the calculate button.
  • Finally, in the output field, the horsepower for the provided inputs will be displayed.

FAQs on Horsepower Calculator

1. What about the formula for calculating horsepower?

Horsepower is a unit of measurement for power that is equal to 550 foot-pounds per second in imperial units. It is roughly equivalent to 746 watts. The horsepower is expressed in SI units as hp. It's a term that's typically used to describe an engine's power. It is a measurement of the rate at which mechanical energy is consumed. The formula for calculating horsepower is as follows:

Horsepower = (T * N) / 5252 hp

  • Where, The torque is represented by the letter T
  • The number N denotes the rate


2. Define the unit watt?

A watt is one joule per second, and it's commonly used to measure the rate of energy transmission for low-power applications like lightbulb or smartphone charging.


3. Is a horse equal to 1 HP?

Each horse pushed with a force of 180 pounds, according to Watt. Watt concluded that one horsepower was equal to a horse doing 33,000 foot-pounds of effort in one minute based on this. One horsepower is equal to that amount of work.


4. How many mph is a horsepower?

The thrust horsepower of jet engines and rockets is calculated by multiplying the thrust in pounds force by the vehicle's speed in miles per hour and dividing by 375. (Which is equal to one horsepower measured in mile-pounds per hour).