Unit conversion
Power Converter
Convert watts, kilowatts, mechanical horsepower, metric horsepower, and IT Btu per hour.
Convert a value
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Power is energy per unit time
One watt is one joule per second. A power value alone cannot tell you total energy consumed; you also need the duration.
Mechanical horsepower is 550 foot-pounds force per second. Metric horsepower (PS) is 75 kilogram-force meters per second. They differ; electrical and boiler horsepower are not included.
Example
1 mechanical horsepower is approximately 745.699872 W.
Precision and input limits
Results use browser floating-point arithmetic and are rounded to your selected number of significant digits, not decimal places. Small or large results may use scientific notation. This is not an arbitrary-precision calculator.
Enter zero or a number with magnitude from 1e-100 to 1e100. Signed values are supported for mathematical conversions. Swap units exchanges the unit choices without changing your input. Editing an input clears the previous result.