Horsepower to Watts (hp → W)
Formula
1 hp = 745.7 WConversion Table
| hp | W |
|---|---|
| 0 | 0 |
| 1.0000 | 745.70 |
| 2.0000 | 1,491.4 |
| 3.0000 | 2,237.1 |
| 4.0000 | 2,982.8 |
| 5.0000 | 3,728.5 |
| 6.0000 | 4,474.2 |
| 7.0000 | 5,219.9 |
| 8.0000 | 5,965.6 |
| 9.0000 | 6,711.3 |
| 10.000 | 7,457.0 |
| 11.000 | 8,202.7 |
| 12.000 | 8,948.4 |
| 13.000 | 9,694.1 |
| 14.000 | 10,440 |
| 15.000 | 11,186 |
| 16.000 | 11,931 |
| 17.000 | 12,677 |
| 18.000 | 13,423 |
| 19.000 | 14,168 |
| hp | W |
|---|---|
| 20.000 | 14,914 |
| 21.000 | 15,660 |
| 22.000 | 16,405 |
| 23.000 | 17,151 |
| 24.000 | 17,897 |
| 25.000 | 18,643 |
| 26.000 | 19,388 |
| 27.000 | 20,134 |
| 28.000 | 20,880 |
| 29.000 | 21,625 |
| 30.000 | 22,371 |
| 31.000 | 23,117 |
| 32.000 | 23,862 |
| 33.000 | 24,608 |
| 34.000 | 25,354 |
| 35.000 | 26,100 |
| 36.000 | 26,845 |
| 37.000 | 27,591 |
| 38.000 | 28,337 |
| 39.000 | 29,082 |
| hp | W |
|---|---|
| 40.000 | 29,828 |
| 41.000 | 30,574 |
| 42.000 | 31,319 |
| 43.000 | 32,065 |
| 44.000 | 32,811 |
| 45.000 | 33,557 |
| 46.000 | 34,302 |
| 47.000 | 35,048 |
| 48.000 | 35,794 |
| 49.000 | 36,539 |
| 50.000 | 37,285 |
| 51.000 | 38,031 |
| 52.000 | 38,776 |
| 53.000 | 39,522 |
| 54.000 | 40,268 |
| 55.000 | 41,014 |
| 56.000 | 41,759 |
| 57.000 | 42,505 |
| 58.000 | 43,251 |
| 59.000 | 43,996 |
| hp | W |
|---|---|
| 60.000 | 44,742 |
| 61.000 | 45,488 |
| 62.000 | 46,233 |
| 63.000 | 46,979 |
| 64.000 | 47,725 |
| 65.000 | 48,471 |
| 66.000 | 49,216 |
| 67.000 | 49,962 |
| 68.000 | 50,708 |
| 69.000 | 51,453 |
| 70.000 | 52,199 |
| 71.000 | 52,945 |
| 72.000 | 53,690 |
| 73.000 | 54,436 |
| 74.000 | 55,182 |
| 75.000 | 55,928 |
| 76.000 | 56,673 |
| 77.000 | 57,419 |
| 78.000 | 58,165 |
| 79.000 | 58,910 |
Horsepower to Watts Conversion
Converting Horsepower (hp) to Watts (W) is a common energy and power conversion. 1 hp equals 745.7 W. For example, 100 hp is equal to 74,570 W.
Quick Mental Math: Horsepower to Watts
For energy conversions, identify the unit scale difference in the prefix or definition.
Why is converting Horsepower to Watts tricky?
Energy unit conversions involve non-linear factors across different measurement systems.
Quick Reference Values
1 hp = 745.7 W. 5 hp = 3,728.5 W. 10 hp = 7,457 W. 25 hp = 18,642.5 W. 50 hp = 37,285 W. 100 hp = 74,570 W.
What is Horsepower?
Horsepower (hp) is a unit of energy and power. Horsepower is a unit of power originally defined to compare the output of steam engines with draft horses. The mechanical horsepower equals exactly 745.7 watts, as standardized by the SAE and ISO. It measures the rate of work or energy transfer in engines and motors [nist-cuu]. James Watt introduced the horsepower unit in the late 18th century to market his improved steam engines by equating their power to that of horses. This practical definition facilitated industrial adoption and standardization of power output metrics [nist-cuu]. Horsepower remains common in automotive, marine, and industrial machinery industries, especially in the US and Europe. Although the watt is the SI unit for power, horsepower is often used in marketing and technical specifications [nist-cuu].
What is Watts?
Watts (W) is a unit of energy and power. The watt (W) is the SI unit of power, defined as one joule per second (1 W = 1 J/s). It measures the rate of energy transfer or conversion. The watt is named after James Watt and standardized by the BIPM according to the International System of Units [bipm-si-brochure]. Named after engineer James Watt in the late 19th century, the watt was adopted officially by the CIPM and BIPM to quantify mechanical and electrical power consistently. It became part of the SI base units in 1960 [bipm-si-brochure]. Watts measure power output and consumption in electrical, mechanical, and thermal systems globally. It is used across industries, including electronics, automotive, and power generation, following ISO and NIST standards [nist-sp-811].
Common Misspellings
People often search for this conversion using these alternate spellings: horse power, horsepower, hp, horsepwer, horspower, watt, wat, wats, wattss. All of these refer to the Horsepower to Watts conversion.