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Watts to Horsepower Converter

Convert watts to horsepower and horsepower to watts instantly. Bidirectional power converter with formula and common values.

W

Horsepower

1.0004

hp

746 W = 1.0004 hp

hp = W × 0.00134102

Watts to Horsepower: 1 W equals 0.001341 hp. To convert watts to horsepower, multiply by 0.001341 (hp = W × 0.00134102). For example, 10 W = 0.01341 hp.

How to Convert Watts to Horsepower

To convert from watts to horsepower, multiply the value by 0.001341. The conversion is linear, meaning doubling the input doubles the output.

Conversion Formula

  • Watts to Horsepower: hp = W × 0.00134102
  • Horsepower to Watts: W = hp ÷ 0.00134102

Watts to Horsepower Conversion Chart

Watts (W)Horsepower (hp)
0.10.000134
0.250.000335
0.50.000671
10.001341
20.002682
30.004023
50.006705
100.01341
200.02682
250.033525
500.067051
1000.134102
2500.335255
10001.34102

Understanding the Units

What is a Watt?

The watt is the SI derived unit of power, equal to one joule per second (1 W = 1 J/s = 1 V·A).

Named after James Watt (1736–1819), the Scottish engineer whose improvements to the steam engine helped drive the Industrial Revolution.

Common contexts: electricity, mechanics, lighting.

What is a Horsepower?

One mechanical horsepower equals exactly 745.6998715822702 watts; one metric horsepower equals exactly 735.49875 watts.

Defined by James Watt to compare steam engines to draft horses pulling weights.

Common contexts: automotive, small engines.

Real-World Reference Points

Item Watts (W) Horsepower (hp)
LED bulb90.0121
Incandescent bulb (old)600.0805
Microwave oven10001.341

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FAQ

How many horsepower is one watt?

One watt equals approximately 0.00134102 mechanical horsepower. It takes about 745.7 watts to make one horsepower.

How do I convert a motor rated in watts to horsepower?

Multiply the watt rating by 0.00134102, or equivalently divide by 745.7. For example, 2,500 W = 3.353 hp.

Is this the same for electric and gasoline motors?

The unit conversion is the same regardless of motor type. However, electric motors are typically more efficient at converting input power to output power than combustion engines.

Why are small motors rated in watts rather than horsepower?

Watts are the SI standard unit of power and are more precise for small values. Expressing a 50 W motor as 0.067 hp would be less intuitive for most applications.

How many horsepower are in 1 watt?

1 W equals 0.001341 hp.

How do you convert watts to horsepower?

Multiply the watt value by 0.001341. Formula: hp = W × 0.00134102.

How many horsepower are in 5 watts?

5 W = 0.006705 hp.

How do you convert horsepower back to watts?

Use the inverse formula: W = hp ÷ 0.00134102. For example, 1 hp = 745.701034 W.

What is the difference between Watt and Horsepower?

The watt is the SI derived unit of power, equal to one joule per second (1 W = 1 J/s = 1 V·A). One mechanical horsepower equals exactly 745.6998715822702 watts; one metric horsepower equals exactly 735.49875 watts.