Convert Horsepower to Watts
Enter the power in horsepower below to get the value converted to watts.
How to Convert Horsepower to Watts
To convert horsepower to a watt measurement, use one of the formulas below.
Mechanical Horsepower to Watts
Formula to convert mechanical horsepower to watts:
Since one mechanical horsepower is equal to 745.699872 watts, the formula to find watts is to multiply mechanical horsepower by 745.699872.
Electric Horsepower to Watts
Formula to convert electric horsepower to watts:
Since one electric horsepower is equal to 746 watts, the formula to find watts is to multiply electric horsepower by 746.
Metric Horsepower to Watts
Formula to convert metric horsepower to watts:
Since one metric horsepower is equal to 735.49875 watts, the formula to find watts is to multiply metric horsepower by 735.49875.
Boiler Horsepower to Watts
Formula to convert boiler horsepower to watts:
Since one boiler horsepower is equal to 9,809.5 watts, the formula to find watts is to multiply boiler horsepower by 9,809.5.
Horsepower and watts are both units used to measure power. Keep reading to learn more about each unit of measure.
The term horsepower was adopted by Scottish inventor James Watt to measure the power output of his steam engine and to compare that power with that of horses horses. Horsepower were later used to measure the power output of piston and turbine engines and electrical motors.
There are now several different types of horsepower, including mechanical, electrical, metric, boiler, brake, and indicated, and they all have different applications in industry. Mechanical and electric are the most commonly used types.
Mechanical horsepower is often used to measure the output of engines and motors in North America. One mechanical horsepower is equal to 745.69987158227022 watts.
The mechanical horsepower is a US customary and imperial unit of power. Mechanical horsepower can be abbreviated as hp(I), for example 1 mechanical horsepower can be written as 1 hp(I).
Electric horsepower is used to measure the output of electric motors and other electrical machines in the US. One electric horsepower is equal to exactly 746 watts.
The electric horsepower is a US customary and imperial unit of power. Electric horsepower can be abbreviated as hp(E), for example 1 electric horsepower can be written as 1 hp(E).
The metric horsepower is a non-SI metric unit for power. Metric horsepower can be abbreviated as hp(M), and are also sometimes abbreviated as PS, cv, hk, pk, ks, or ch. For example, 1 metric horsepower can be written as 1 hp(M), 1 PS, 1 cv, 1 hk, 1 pk, 1 ks, or 1 ch.
Boiler horsepower can be abbreviated as hp(S), for example 1 boiler horsepower can be written as 1 hp(S).
Try our engine horsepower calculator to calculate the power of a motor.
One watt is the power equal to the rate of energy of one joule per second in an electrical circuit. One watt is also equal to the power produced in a circuit with a voltage potential of one volt with a current of one amp.
The watt is the SI derived unit for power in the metric system. Watts can be abbreviated as W, for example 1 watt can be written as 1 W.
PW = IA × VV
Horsepower to Watt Conversion Table
|Watts||Mechanical Horsepower||Electric Horsepower||Metric Horsepower||Boiler Horsepower|
- Encyclopædia Britannica, Horsepower, https://www.britannica.com/science/horsepower
- Merriam-Webster, metric horsepower, https://www.merriam-webster.com/dictionary/metric%20horsepower
- Wikipedia, Horsepower, https://en.wikipedia.org/wiki/Horsepower
- International Bureau of Weights and Measures, The International System of Units, 9th Edition, 2019, https://www.bipm.org/utils/common/pdf/si-brochure/SI-Brochure-9.pdf