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Milliwatts to Kilowatts (mW to kW)

Milliwatts and kilowatts are both units of power, and one milliwatt equals 0.000001 kilowatts. Enter a value in milliwatts, press Convert, and the matching figure in kilowatts appears.

Converting milliwatts to kilowatts

To change milliwatts into kilowatts you divide by one million. A kilowatt takes 1,000,000 milliwatts to fill, so the kilowatt figure always comes out far smaller than the milliwatt figure you started with.

For a worked case, 300 milliwatts divided by 1,000,000 gives 0.0003 kilowatts. Everyday values in the hundreds of milliwatts therefore produce results with several leading zeros after the decimal point, and the result only reaches 1 kW once you hit 1,000,000 mW.

mW to kW formula

P(kW) = P(mW) / 1000000

In words: the power in kilowatts equals the power in milliwatts divided by one million. The conversion factor is 1/1000000, so multiplying a milliwatt reading by 0.000001 lands on the same kilowatt value as dividing it by 1000000.

The chart below lists common milliwatt values next to their kilowatt equivalents, and the reverse relationship holds as well: 1000 mW lines up with 0.001 kW.