Horsepower to Watts

Convert hp to W instantly — with a table, common power values, and a live calculator.

1 hp equals 745.7 W.

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Result (W)745.7 W

hp to W table

hpW
1 hp745.7 W
2 hp1491.4 W
3 hp2237.1 W
5 hp3728.5 W
10 hp7457 W
15 hp11185.5 W
20 hp14914 W
25 hp18642.5 W
30 hp22371 W
40 hp29827.99 W
50 hp37284.99 W
60 hp44741.99 W
75 hp55927.49 W
90 hp67112.99 W
100 hp74569.99 W
120 hp89483.98 W
150 hp111854.98 W
200 hp149139.97 W
250 hp186424.97 W
300 hp223709.96 W
400 hp298279.95 W
500 hp372849.94 W

W to hp (reverse)

Whp
1 W0.00134 hp
2 W0.00268 hp
3 W0.00402 hp
5 W0.00671 hp
10 W0.0134 hp
15 W0.0201 hp
20 W0.0268 hp
25 W0.0335 hp
30 W0.0402 hp
40 W0.0536 hp
50 W0.0671 hp
60 W0.0805 hp
75 W0.101 hp
90 W0.121 hp
100 W0.134 hp
120 W0.161 hp
150 W0.201 hp
200 W0.268 hp
250 W0.335 hp
300 W0.402 hp
400 W0.536 hp
500 W0.671 hp

Common power values

hpW
5 hp3728.5 W
10 hp7457 W
25 hp18642.5 W
50 hp37284.99 W
75 hp55927.49 W
100 hp74569.99 W
120 hp89483.98 W
150 hp111854.98 W
200 hp149139.97 W
300 hp223709.96 W
400 hp298279.95 W
500 hp372849.94 W

How it scales

186423728555927745700255075100hp

100 kW in other units

134hp136PS100000W341214BTU/h

The ratio at a glance

1 hp745.7 W

Kilowatts, PS, and hp — the key power units

Watts (W), kilowatts (kW), and megawatts (MW) are the SI units of power. There are also two different horsepower units that must not be confused: PS (metric horsepower, German Pferdestärke) equals exactly 735.49875 W, while hp (mechanical / imperial horsepower) equals exactly 745.6998715823 W (about 745.7 W). They differ by about 1.4 % — 1 hp ≈ 1.01387 PS. German and European vehicle specs are quoted in PS, whereas hp is used mainly in the US and UK.

Power conversions are exact and rest on fixed factors — for more unit pairs, use our power conversion hub.

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Frequently asked questions

How many W are in 1 hp?

1 hp equals 745.7 W.

How many W are in 2 hp?

2 hp equal 1491.4 W.

How do I convert hp to W?

Multiply the power in hp by 745.7 to get W.

What is mechanical horsepower (hp)?

Mechanical horsepower (hp) is imperial horsepower, equal to exactly 745.6998715823 W (about 745.7 W). It is used mainly in the US and UK — not to be confused with metric horsepower (PS), which equals 735.49875 W and is used for vehicles in Germany.

What are these power units used for?

Watts (W), kilowatts (kW), and megawatts (MW) are the SI units of power, used for electricity and engines. PS (metric horsepower) is used for German and European vehicles, mechanical hp in English-speaking countries, and BTU per hour (BTU/h) for heating and air-conditioning.

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