Horsepower to Watts Converter

1 horsepower (hp) equals 745.699871582 watts (W).

Quick answer

One horsepower is 745.7 watts: multiply hp by 745.7.

  • 1 horsepower = 745.6998716 watts
  • 1 watt = 0.00134102209 horsepower
  • Formula: W = hp × 745.699871582
  • Quick estimate: multiply by 750 and take off 0.6%: 2 hp ≈ 1,490 W.

1 horsepower = 745.6998716 watts

How to convert horsepower to watts

W = hp × 745.699871582

To convert horsepower to watts, multiply the number of horsepower by 745.699871582.

Example: 42 hp to W

  1. Start with the value in horsepower: 42 hp.
  2. Multiply by 745.699871582: 42 × 745.699871582 = 31,319.39461.
  3. Result: 42 horsepower = 31,319.39461 watts.

Going the other way, 1 watt = 0.00134102209 horsepower, so to convert watts back to horsepower you divide by the same number. See watts to horsepower.

Where the conversion factor comes from

One mechanical horsepower is 745.7 W (33,000 ft·lbf per minute, as defined by James Watt). The metric horsepower (PS) is 735.5 W, and US electric motors use exactly 746 W per horsepower.

Mental math: hp to W in your head

Multiply by ¾ kW (750 W).

When you need to convert horsepower to watts

  • Electric motor, pump and generator ratings.
  • Comparing engines with electric motors.

Common mistakes

  • Confusing PS (metric horsepower) with hp.

Everyday horsepower in watts

ExampleHorsepowerWatts
Blender motor1 hp745.7 W
Pool pump1.5 hp1,118.5 W
Small outboard motor10 hp7,457 W

Horsepower to watts conversion table

Horsepower (hp)Watts (W)
0.1 hp 74.56998716 W
0.2 hp 149.1399743 W
0.3 hp 223.7099615 W
0.4 hp 298.2799486 W
0.5 hp 372.8499358 W
0.6 hp 447.4199229 W
0.7 hp 521.9899101 W
0.8 hp 596.5598973 W
0.9 hp 671.1298844 W
1 hp 745.6998716 W
1.5 hp 1,118.549807 W
2 hp 1,491.399743 W
2.5 hp 1,864.249679 W
3 hp 2,237.099615 W
3.5 hp 2,609.949551 W
4 hp 2,982.799486 W
4.5 hp 3,355.649422 W
5 hp 3,728.499358 W
6 hp 4,474.199229 W
7 hp 5,219.899101 W
7.5 hp 5,592.749037 W
8 hp 5,965.598973 W
9 hp 6,711.298844 W
10 hp 7,456.998716 W
11 hp 8,202.698587 W
12 hp 8,948.398459 W
13 hp 9,694.098331 W
14 hp 10,439.7982 W
15 hp 11,185.49807 W
16 hp 11,931.19795 W
17 hp 12,676.89782 W
18 hp 13,422.59769 W
19 hp 14,168.29756 W
20 hp 14,913.99743 W
21 hp 15,659.6973 W
22 hp 16,405.39717 W
23 hp 17,151.09705 W
24 hp 17,896.79692 W
25 hp 18,642.49679 W
26 hp 19,388.19666 W

More hp to W values

What is a horsepower?

The horsepower (mechanical or imperial horsepower) is 550 foot-pounds of work per second, about 745.7 watts.

More about horsepower →

What is a watt?

The watt is the SI unit of power: one joule of energy per second.

More about watts →

Convert horsepower to other units

Convert other units to watts

Frequently asked questions

How many watts are in a horsepower?

One horsepower is 745.6998716 watts.

How many horsepower are in a watt?

One watt is 0.00134102209 horsepower.

What is the formula to convert horsepower to watts?

W = hp × 745.699871582.

How many watts is 1 hp?

745.7 W.