Horsepower (mechanical) to Watts Converter

1 hp equals 745.69987 W, and 1 W equals 0.0013410221 hp. Enter a value in either box to convert horsepower (mechanical) to watts and back. Formula: watts = value x unit factor (1 hp = 550 ft-lbf/s = 745.6998715822702 W; 1 PS = 75 kgf-m/s = 735.49875 W).

· CalcFlow Editorial

1 hp = 745.69987 W

Results shown are estimates for informational purposes only. Nothing on CalcFlow is financial, tax, legal, or medical advice. Always consult a qualified professional before making important decisions.

Horsepower (mechanical) to Watts Conversion Table

Horsepower (mechanical)Watts
1 hp745.69987 W
5 hp3,728.4994 W
10 hp7,456.9987 W
50 hp37,284.994 W
100 hp74,569.987 W
150 hp111,854.98 W
200 hp149,139.97 W
500 hp372,849.94 W
1,000 hp745,699.87 W

Watts to Horsepower (mechanical) Conversion Table

WattsHorsepower (mechanical)
1 W0.0013410221 hp
5 W0.0067051104 hp
10 W0.013410221 hp
50 W0.067051104 hp
100 W0.13410221 hp
150 W0.20115331 hp
200 W0.26820442 hp
500 W0.67051104 hp
1,000 W1.3410221 hp

Worked example: 10 hp = 7,456.9987 W. A 150 hp engine delivers 150 x 745.7 = 111.85 kW. A 12,000 BTU/h air conditioner draws about 12,000 x 0.29307 = 3,517 W of cooling capacity.

Need other units? Open the full Power Converter.

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Horsepower (mechanical) to KilowattsKilowatts to Horsepower (mechanical)Watts to Horsepower (mechanical)Horsepower (metric) to KilowattsKilowatts to Horsepower (metric)

Formula

watts = value x unit factor (1 hp = 550 ft-lbf/s = 745.6998715822702 W; 1 PS = 75 kgf-m/s = 735.49875 W)

Understanding Power Conversion

Power is the rate of doing work, with the watt (one joule per second) as the SI unit. Engines are still rated in horsepower in many markets. Mechanical horsepower (used in the US and UK) is exactly 550 foot-pounds per second, about 745.7 W, while metric horsepower (PS or CV, used in continental Europe) is 75 kilogram-force meters per second, about 735.5 W. Air conditioners and furnaces are often rated in BTU per hour.

Tips and Best Practices

  • 1Multiply horsepower by 0.7457 to get kilowatts.
  • 2Multiply kilowatts by 1.341 to get mechanical horsepower.
  • 3One BTU per hour is about 0.293 W.

Real-World Example

A 150 hp engine delivers 150 x 745.7 = 111.85 kW. A 12,000 BTU/h air conditioner draws about 12,000 x 0.29307 = 3,517 W of cooling capacity.

Common Mistakes to Avoid

  • Treating metric and mechanical horsepower as the same; they differ by about 1.4 percent.
  • Confusing BTU (energy) with BTU per hour (power).
  • Reading a kW rating as kWh.

How to Use

  1. Type a number in the Horsepower (mechanical) box.
  2. The Watts result appears instantly; you can also edit the Watts box to convert backwards.
  3. Use the swap button to reverse the direction and Copy result to copy the answer.

Frequently Asked Questions

Q

How many watts are in 1 hp?

1 hp equals 745.69987 W.
Q

How many horsepower (mechanical) are in 1 W?

1 W equals 0.0013410221 hp.
Q

What is the formula to convert horsepower (mechanical) to watts?

watts = value x unit factor (1 hp = 550 ft-lbf/s = 745.6998715822702 W; 1 PS = 75 kgf-m/s = 735.49875 W).
Q

Is a PS the same as a hp?

No. One metric horsepower (PS) is 735.49875 W, slightly less than a mechanical horsepower.

Sources: NIST SP 811 (horsepower = 550 ft lbf/s; BTU_IT); DIN 66036 (metric horsepower = 75 kgf m/s with g_n = 9.80665 m/s2).

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