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Convert watt to milliwatt

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

Example: watt to milliwatt

  • 1 watt = 1000 milliwatt

Watt to milliwatt conversion table

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

Watt to milliwatt formula

To convert watt to milliwatt, multiply by 1000.

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

Common power conversion mistakes

  • '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 and milliwatt conversion quiz

Score: 0

8.7 watt equals 8 700 milliwatt.

Correct answer: 8.7 watt = 8 700 milliwatt.

104 watt equals 156 000 milliwatt.

Correct answer: 104 watt = 104 000 milliwatt.

44 milliwatt equals 0.066 watt.

Correct answer: 44 milliwatt = 0.044 watt.

243 milliwatt equals 0.486 watt.

Correct answer: 243 milliwatt = 0.243 watt.

239 watt equals 120 000 milliwatt.

Correct answer: 239 watt = 239 000 milliwatt.

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