Watts to Milliwatts converter

To convert watts to milliwatts, enter the value in the first field. The result in milliwatts is calculated automatically using the exact conversion factor.

1 W = 1000 mW
1 mW = 0.001 W

Formula: mW = W × 1000
W = mW × 0.001

Definitions: 1 mW = 0.001 W

The watt (W) is the SI unit of power, one joule per second. It is used for the rating of light bulbs, appliances, chargers and speakers.

The milliwatt (mW) is one thousandth of a watt. It is used for the output of laser pointers and lasers, for low-power electronics and for radio signal levels.

See the conversion table with commonly used values, handy for quick reference or study.