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    Convert Horsepower to Watts

    1 horsepower (hp) equals 745.6998716 watts (W).

    hp
    Swap: convert watts to horsepower
    W

    1 hp = 745.6998716 W

    Type in either box. Scientific notation works: 1.5e-3.

    Converting a list? Use the bulk horsepower to watt converter to paste a column from Excel.

    How to Convert Horsepower to Watt

    • 1 hp = 745.6998716 W
    • 1 W = 0.00134102209 hp
    • Example: convert 15 hp to W: 15 hp = 15 × 745.6998716 W = 11185.49807 W

    Reference conditions. hp: Mechanical (imperial) horsepower, 550 ft·lbf/s. Metric horsepower (PS) is about 1.4 % smaller.

    Formula

    W = hp × 745.6998715823

    Derivation from SI units:

    • 1 hp = 550 ft·lbf/s = 745.69987158227 W
    • 1 W = 1 J/s = 1 kg·m²·s⁻³

    Both units are defined exactly, so the factor is exact. Horsepower definition: horsepower; Watt definition: watt.

    Worked examples

    1. A 0.5 hp pump motor is 372.8499358 W.
      0.5 hp × 745.6998716 = 372.8499358 W
    2. A 2 hp compressor is 1491.399743 W.
      2 hp × 745.6998716 = 1491.399743 W

    Horsepower to Watt conversion table

    Horsepower to Watt conversion table
    Horsepower (hp)Watts (W)
    0.25 hp186.4249679 W
    0.5 hp372.8499358 W
    1 hp745.6998716 W
    1.5 hp1118.549807 W
    2 hp1491.399743 W
    5 hp3728.499358 W
    10 hp7456.998716 W
    25 hp18642.49679 W
    50 hp37284.99358 W
    100 hp74569.98716 W
    150 hp111854.9807 W
    200 hp149139.9743 W
    300 hp223709.9615 W
    400 hp298279.9486 W
    500 hp372849.9358 W
    1000 hp745699.8716 W

    Where it's used

    Fractional-horsepower motor ratings are converted to watts for electrical design and energy calculations.

    Horsepower to other power units

    1 hp expressed in every power unit
    Conversion1 hp equals
    horsepower to watt 745.6998716 W
    horsepower to milliwatt 745699.8716 mW
    horsepower to kilowatt 0.7456998716 kW
    horsepower to megawatt 0.0007456998716 MW
    horsepower to metric horsepower 1.013869665 PS
    horsepower to BTU per hour 2544.433578 BTU/h
    horsepower to refrigeration ton 0.2120361315 TR
    horsepower to kilocalorie per hour 641.186476 kcal/h
    horsepower to foot-pound per second 550 ft·lbf/s

    Frequently asked questions

    Is 1 hp 746 W?

    Close: 1 mechanical hp = 745.69987 W. The "electrical horsepower" is defined as exactly 746 W.

    How many watts are in 1 horsepower?

    1 hp = 745.6998716 W.

    How do I convert horsepower to watts?

    Multiply the value in hp by 745.6998716. For example, 15 hp × 745.6998716 = 11185.49807 W.

    Is the hp to W conversion exact?

    Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).

    Sources

    Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.

    Cite this page

    APA

    Scientific Converters. (2026, October 15). Convert Horsepower to Watts. Retrieved October 17, 2026, from https://scientificconverters.com/power/horsepower-to-watts/

    IEEE

    Scientific Converters, "Convert Horsepower to Watts," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/power/horsepower-to-watts/