 # Power Conversion

## Power Converter

Power conversion calculator – convert different power units.

mW, W, kW, MW, GW, dBm, dBW, hp(I), hp(E) adn BTU/hr conversion calculator.

## What is a watt?

Watt is a basic SI unit of power and it is equal to one joule per second.

1 watt = 1 joules / second

1 W = 1 * J / s =

1 * N * m / s =

1 * kg * m² / s³ in basic SI units

Watt can also be defined in terms of electromagnetism:

1 watt = 1 ampere * 1 volt

### SI Unit Watt

The most common ones are the SI unit watt and its most frequently used multiples:

• milliwatts (mW)
• watts (W)
• kilowatts (kW)
• megawatts (MW)
• gigawatts (GW)

There are other power units, including horsepowers:

• British thermal units per hour (Btu/h, sometimes known as Btu or BTU)
• mechanical horsepowers (hp(l))
• electric horsepowers (hp(E))

## Power Conversions

The formulas implemented in power converter to change between any from popular power units into watts look as follows:

• 1 milliwatt [mW] = 0.001 watt [W] = 10⁻³ watt [W]
• 1 kilowatt [kW] = 1000 watt [W] = 10³ watt [W]
• 1 megawatt [MW] = 1000000 watt [W] = 10⁶ watt [W]
• 1 gigawatt [GW] = 1000000000 watt [W] = 10⁹ watt [W]
• 1 Btu/hour [Btu/h] = 0.293071 watt [W]
• 1 mechanical horsepower [hp(l)] = 745.6998715823 watt [W]
• 1 electric horsepower [hp(E)] = 746 watt [W]