Power Converter
Convert between power units — watts, kilowatts, megawatts, horsepower, metric horsepower and more.
Reviewed by the ToolNestr Editorial Team — July 2026
About this power converter
Power is the rate of doing work or using energy, measured in watts and horsepower. This power converter lets you move between 7 different power units in either direction. Pick the unit you are starting from, the unit you want, and enter a value — the result appears instantly as you type, with the calculation running entirely in your browser.
Internally, every unit is defined by its exact ratio to a single base unit, the watt. To convert, the tool first changes your value into the base unit, then into the target unit. This base-unit method keeps results consistent and precise no matter which pair of units you choose, and makes it easy to add uncommon units alongside the everyday ones.
Use the swap control to reverse the direction at any time, which is handy when you are checking a figure both ways. Because the converter is mobile-first and works offline once loaded, it is a quick reference for power whether you are studying, working, travelling or shopping across measurement systems.
Supported power units
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Frequently asked questions
How does this power converter work?
Choose the unit you have and the unit you want, type a value, and the tool converts it via a common base unit (the watt). It supports 7 power units.
Is the power converter accurate?
Yes. Every unit is defined by its exact ratio to the watt, so conversions are precise; displayed results are rounded for readability.
Can I convert in both directions?
Yes. Swap the “from” and “to” units, or press the swap button, to convert either way between any two power units.
Which power units are supported?
It includes Watts, Kilowatts, Megawatts, Horsepower, Metric horsepower, BTU per hour, Foot-pounds per second.