How to Convert Horsepower to Watts Manually
You can convert horsepower to watts manually by multiplying the horsepower value by the correct conversion factor based on the horsepower standard being used.
What Is Horsepower?
Horsepower is a unit of power that measures the rate of doing work. Engineers commonly use Mechanical Horsepower, Metric Horsepower, Brake Horsepower, and Electric Horsepower to rate Electric Motors, engines, pumps, compressors, and other industrial equipment.
What Is a Watt?
A Watt is the SI Unit of power that represents one joule of energy transferred each second. Electrical engineering, mechanical engineering, generators, turbines, and industrial machinery commonly express output power, input power, and rated power in watts.
Horsepower to Watts Conversion Formula
For Mechanical Horsepower:
For Metric Horsepower:
Where:
- Horsepower = Input power value
- 745.699872 = Mechanical Horsepower conversion factor
- 735.49875 = Metric Horsepower conversion factor
- Watts = Output power in the SI Unit
Practical Example of Horsepower to Watts Conversion
Suppose an Electric Motor is rated at 5 Mechanical Horsepower.
Using the formula:
Result:
This calculation helps engineers, technicians, and equipment manufacturers compare motor power ratings using the International System of Units and standardized engineering specifications.
Horsepower to Watts Conversion Table
Horsepower (hp) | Watts (W) |
|---|
0.25 | 186.42 |
1 | 745.70 |
2 | 1491.40 |
50 | 37284.99 |
75 | 55927.49 |
100 | 74569.99 |
Note: Always verify whether the rating uses Mechanical Horsepower, Metric Horsepower, or another horsepower standard, as each uses a different conversion factor and affects calculation accuracy.