Watts to Mechanical Horsepower
Convert Watts to Mechanical Horsepower instantly. Free online power unit converter with exact formula, conversion table and FAQ.
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Formula
hp = W × 0.0013410221
W = hp × 745.6998715822702
Conversion table
| 1 W | 0.001341 hp |
| 5 W | 0.006705 hp |
| 10 W | 0.013410 hp |
| 20 W | 0.026820 hp |
| 50 W | 0.067051 hp |
| 100 W | 0.134102 hp |
| 500 W | 0.670511 hp |
| 1000 W | 1.341022 hp |
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Frequently asked questions
What is the source unit in this conversion?
The source unit is the watt (W), the SI unit of power, equal to one joule per second.
What is the destination unit in this conversion?
The destination unit is the mechanical (imperial) horsepower (hp), a traditional unit of power used for engines and motors.
How do I convert watts to horsepower?
Multiply the watt value by 0.0013410221 to get horsepower. For example, 1000 W × 0.0013410221 = 1.341022 hp.
Is the watts to horsepower conversion exact?
Yes. One mechanical horsepower is defined as exactly 745.6998715822702 watts, so the factor used here is exact.
Where is this conversion commonly used?
It's used for rating car and motorcycle engines, comparing electric motor output to combustion engine output, and describing pump or generator power.
Can I convert horsepower back to watts?
Yes. Multiply the horsepower value by 745.6998715822702 to get watts.
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About this conversion
This page converts watts (W), the SI unit of power, into mechanical horsepower (hp), the traditional unit used for rating engines and motors.
This conversion is common when comparing electric motor ratings, given in watts, to combustion engine ratings, traditionally given in horsepower, such as for cars, generators, and pumps.
The formula is hp = W × 0.0013410221, based on the fixed definition of the mechanical horsepower as 745.6998715822702 watts.
The conversion is exact, since the mechanical horsepower is defined by a fixed numeric relationship to the watt rather than a measured approximation.
The watt is the SI-derived unit of power, while mechanical (imperial) horsepower is a legacy unit that remains common in the automotive industry, especially in the US and UK.