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Convert watt to milliwatt

Here you can quickly calculate how many milliwatt fit in one watt.
  • 1 W = 1000 mW
  • 1 mW = 0.001 W

Watt to milliwatt conversion table

watt milliwatt
1 1000
2 2000
5 5000
10 10000
20 20000
50 50000
100 100000

Formula to convert watt to milliwatt

To convert watt to milliwatt, multiply by 1000.

1 W = 1000 mW
Example: 1 watt = 1000 milliwatt

Common mistakes in power conversion

  • 'Kilowatts per hour' is a common slip of the tongue, power is measured in plain kilowatts. The kilowatt-hour (kWh) is energy: power multiplied by time. A machine draws 3 kW, and uses 3 kWh in one hour.
  • American air conditioners are rated in BTU/h, European ones in watts, 1 kW is about 3,412 BTU/h. A '9,000 BTU' unit is therefore about 2.6 kW. Divide BTU/h by 3,412 to get kilowatts.
  • 'Calories burned per hour' is a power figure, not an amount of energy: 1 kcal/h is about 1.16 W. A run that burns 600 kcal in an hour corresponds to an average output of about 700 W.

Quick watt to/from milliwatt conversion quiz

Score: 0

196 watt equals 1.18e+5 milliwatt.

Correct answer: 196 watt = 1.96e+5 milliwatt.

19.2 milliwatt equals 0.0192 watt.

Correct answer: 19.2 milliwatt = 0.0192 watt.

17.1 milliwatt equals 0.0256 watt.

Correct answer: 17.1 milliwatt = 0.0171 watt.

22.1 watt equals 4.42e+4 milliwatt.

Correct answer: 22.1 watt = 2.21e+4 milliwatt.

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