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Power Converter

Convert power units instantly

Convert between watts, milliwatts, kilowatts, megawatts, horsepower, BTU/hour and foot-pounds per second - instantly as you type.

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About the power converter

The power converter translates between the most common units of power — the rate at which energy is transferred. Type any amount, choose the unit you are converting from and the unit you want, and the result updates live as you type. Use the swap button to reverse the direction in one click.

All conversions run through the watt, the SI unit of power. Standard factors are used: 1 kW = 1000 W, 1 mechanical horsepower = 745.7 W, 1 metric horsepower (PS) = 735.5 W, 1 BTU/h = 0.2931 W, and 1 ft·lb/s = 1.3558 W.

Supported units

  • W, mW, kW, MW, GW
  • hp (mechanical), hp (metric / PS)
  • BTU/h, ft·lb/s, cal/s, kcal/h

How to use the power converter

  1. Enter a value

    Type the power amount you want to convert.

  2. Pick the from and to units

    Select the unit you are converting from and the unit you want to convert to.

  3. Swap if needed

    Use the swap button to reverse the conversion direction instantly.

Frequently asked questions

What is the difference between mechanical and metric horsepower?
One mechanical (imperial) horsepower is 745.7 watts, while one metric horsepower (PS, Pferdestärke) is 735.5 watts. The converter lists both separately.
How do I convert kilowatts to horsepower?
Select kW as the from unit and hp (mech) or hp (metric) as the to unit, then enter your value. The factor is applied automatically.
Are the conversions accurate?
Yes. All units are converted through the watt using standard, internationally recognized factors.
Does it work offline?
The converter runs entirely in your browser, so once the page is loaded it works without an internet connection.
Is the power converter free?
Yes, it is completely free and requires no account or sign-up.

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