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Watt Converters

Convert watts to kilowatts, megawatts, milliwatts, horsepower, BTU per hour and other power units.

What this tool does

Convert watts to kilowatts, megawatts, milliwatts, horsepower, BTU per hour and other power units. Type an amount in watts, choose the units, and the tool converts it to kilowatts. It offers 9 power units and also shows the same amount in the others.

Inputs

  • Value: A number.
  • From: Choose one from 9 options, including Watt, Kilowatt, Megawatt, Gigawatt, Milliwatt, Microwatt. Starts as Watt.
  • To: Choose one of the same 9 units as "From". Starts as Kilowatt.

How to use

  1. Enter the amount you want to convert.
  2. Choose the unit to convert from and the unit to convert to.
  3. Read the result: the converted amount and the same amount in the other units. It appears once every required field has a valid value.

Worked examples

Conversions from watts to kilowatts:

  • 1 W = 0.001 kW
  • 5 W = 0.005 kW
  • 10 W = 0.01 kW
  • 50 W = 0.05 kW
  • 100 W = 0.1 kW

Multiply the number of watts by 0.001 to get kilowatts. Both units are exact definitions, so 0.001 is the exact factor: 1 W = 0.001 kW.

Sources: Watt: SI Brochure, 9th edition (2019). Kilowatt: SI Brochure, 9th edition (2019, updated 2022), Table 7 (SI prefixes).

Limitations

  • Converts units of power only. Watts are not watt-hours; use an energy converter for those.
  • Horsepower is shown as mechanical and metric. Pick the one your source uses.

FAQs

Q: How many kilowatts is a watt?
A: One watt is 0.001 kilowatt. One kilowatt is 1,000 watts.
Q: How many horsepower is one watt?
A: One watt is about 0.001341 mechanical horsepower. One mechanical horsepower is about 745.7 watts.
Q: How many BTU per hour is one watt?
A: One watt is about 3.412 BTU per hour (International Table).

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