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Power Converter

Convert any power unit to another with this free power converter. It supports 6 units including watts, kilowatts, megawatts, horsepower, metric horsepower, btus per hour. Pick a conversion below for a dedicated calculator, formula, and reference table. For example, 1 W = 0.001 kW.

All power conversions

Watt → KilowattWatt → MegawattWatt → HorsepowerWatt → Metric HorsepowerWatt → BTU per HourKilowatt → WattKilowatt → MegawattKilowatt → HorsepowerKilowatt → Metric HorsepowerKilowatt → BTU per HourMegawatt → WattMegawatt → KilowattMegawatt → HorsepowerMegawatt → Metric HorsepowerMegawatt → BTU per HourHorsepower → WattHorsepower → KilowattHorsepower → MegawattHorsepower → Metric HorsepowerHorsepower → BTU per HourMetric Horsepower → WattMetric Horsepower → KilowattMetric Horsepower → MegawattMetric Horsepower → HorsepowerMetric Horsepower → BTU per HourBTU per Hour → WattBTU per Hour → KilowattBTU per Hour → MegawattBTU per Hour → HorsepowerBTU per Hour → Metric Horsepower

About these units

Watt (W)

Definition
The watt (W) is the SI unit of power, equal to one joule of energy per second.
History
Named after James Watt, the improver of the steam engine.
Current use
Watts rate the power of light bulbs, appliances, and electronics everywhere.

Kilowatt (kW)

Definition
A kilowatt (kW) is 1,000 watts, used for larger power figures.
History
It is a metric multiple of the watt.
Current use
Kilowatts rate motors, heaters, EV chargers, and home solar systems.

Megawatt (MW)

Definition
A megawatt (MW) is one million watts, used for large-scale power generation.
History
It became common with industrial-scale electricity production.
Current use
Megawatts rate power stations, wind farms, and grid capacity.

Horsepower (hp)

Definition
Horsepower (hp) is a unit of power equal to about 745.7 watts in its mechanical definition.
History
Defined by James Watt to compare steam engines with the work of draft horses.
Current use
Horsepower rates car, motorcycle, and machinery engines, especially in the US.

Metric Horsepower (PS)

Definition
Metric horsepower (PS) is a power unit of about 735.5 watts, slightly less than mechanical horsepower.
History
It was defined in continental Europe based on metric units.
Current use
Metric horsepower (PS or CV) rates vehicle engines in Europe and Asia.

BTU per Hour (BTU/h)

Definition
BTU per hour (BTU/h) is a unit of power expressing energy transfer of one BTU each hour, about 0.293 watts.
History
It developed with heating and cooling engineering.
Current use
BTU/h rates the capacity of air conditioners, furnaces, and heaters in the US.

Frequently asked questions

What power units can I convert?

This power converter supports 6 units: watts, kilowatts, megawatts, horsepower, metric horsepower, btus per hour. Select any pair below to open a dedicated converter with a formula and conversion table.

How accurate is the power converter?

Conversions use exact definitional factors, so results are accurate to the precision you need for science, engineering, and everyday use. Values are rounded only for display.

Is the power converter free?

Yes. Every power conversion is completely free, needs no sign-up, and runs entirely in your browser — your inputs never leave your device.

Free, private, and instant — every conversion runs in your browser.

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