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Horsepower to Watts Converter

Convert mechanical horsepower (hp) to watts (W) as you type — 1 hp = 745.699872 W. Switch units, change the precision or copy the result.

How to use this tool

Steps for using the Unit Converter.

  1. Enter a value in From — mechanical horsepower are already selected.
  2. The result in watts appears instantly. Change either unit to convert to anything else in power.
  3. Use the swap button for the reverse conversion, and set the decimal places you need.
  4. Turn on Show formula to see the calculation, then copy or share the result.

Example

1 hp to W

Mechanical horsepower
1 hp
Watt
W = 1 × 745.6998716 = 745.699872 W

Common use cases

  • Engine and motor ratings in kW and hp.
  • Appliance and solar panel ratings in W and kW.
  • Air-conditioner capacity in BTU/h.

Horsepower to Watts conversion table

mechanical horsepower to watts
Mechanical horsepower (hp)Watt (W)
0.1 hp74.569987 W
0.5 hp372.849936 W
1 hp745.699872 W
2 hp1,491.399743 W
3 hp2,237.099615 W
4 hp2,982.799486 W
5 hp3,728.499358 W
10 hp7,456.998716 W
15 hp11,185.498074 W
mechanical horsepower to watts (continued)
Mechanical horsepower (hp)Watt (W)
20 hp14,913.997432 W
25 hp18,642.49679 W
50 hp37,284.993579 W
75 hp55,927.490369 W
100 hp74,569.987158 W
250 hp186,424.967896 W
500 hp372,849.935791 W
1,000 hp745,699.871582 W

Values rounded to 6 decimal places.

Related conversions

The units

Mechanical horsepower (hp)
550 ft·lbf/s ≈ 745.70 W. Part of the Imperial system.
Watt (W)
1 J/s, the SI unit of power. Part of the SI system.

How to convert mechanical horsepower to watts

Engine and motor ratings. This page uses mechanical horsepower (745.7 W); metric horsepower (PS, 735.5 W) is also in the converter.

To convert mechanical horsepower to watts, use W = hp × 745.6998716. One mechanical horsepower equals 745.699872 watts, and one watt equals 0.001341 mechanical horsepower.

Mechanical horsepower (hp): 550 ft·lbf/s ≈ 745.70 W. Watt (W): 1 J/s, the SI unit of power.

All power units are on the power converter.

Limitations

  • Results are rounded to the decimal places you choose; the calculation itself keeps full precision.

Frequently asked questions

How many watts are in a mechanical horsepower?

1 hp = 745.699872 W. Multiply mechanical horsepower by 745.6998716 (or use W = hp × 745.6998716).

How do I convert mechanical horsepower to watts?

Use W = hp × 745.6998716. For example, 1 hp = 745.6999 W and 10 hp = 7,456.9987 W.

How many watts is one horsepower?

Mechanical horsepower is 745.7 W; metric horsepower (PS) is 735.5 W.

Is electrical power different from mechanical power?

No — both are measured in watts. Electrical power is volts × amps (for DC), but the unit is the same.