Convert Watts to Milliwatts

Enter the power in watts below to get the value converted to milliwatts.

Results in Milliwatts:
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1 W = 1,000 mW
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How to Convert Watts to Milliwatts

conversion scale showing watts and equivalent milliwatts power values

To convert a watt measurement to a milliwatt measurement, multiply the power by the conversion ratio. One watt is equal to 1,000 milliwatts, so use this simple formula to convert:

milliwatts = watts × 1,000

The power in milliwatts is equal to the watts multiplied by 1,000.

For example, here's how to convert 5 watts to milliwatts using the formula above.
5 W = (5 × 1,000) = 5,000 mW

Watts and milliwatts are both units used to measure power. Keep reading to learn more about each unit of measure.


One watt is the power equal to the rate of energy of one joule per second in an electrical circuit. One watt is also equal to the power produced in a circuit with a voltage potential of one volt with a current of one amp.

The watt is the SI derived unit for power in the metric system. Watts can be abbreviated as W, for example 1 watt can be written as 1 W.

Watt's Law states the relationship between power, current, and voltage. Using Watt's Law, it's possible to express the power in watts as an expression using current and voltage.

PW = IA × VV

The power in watts is equal to the current in amperes times the potential difference in volts.

Combining this with Ohm's Law, it's also possible to express the power in watts using resistance in addition to volts and amps.


One milliwatt is the power equal to 1/1,000 of a watt, or the energy consumption at a rate of 1/1,000 of a joule per second.

The milliwatt is a multiple of the watt, which is the SI derived unit for power. In the metric system, "milli" is the prefix for 10-3. Milliwatts can be abbreviated as mW, for example 1 milliwatt can be written as 1 mW.

Watt Measurements and Equivalent Milliwatt Conversions

Common watt values converted to the equivalent milliwatt value
Watts Milliwatts
1 W 1,000 mW
2 W 2,000 mW
3 W 3,000 mW
4 W 4,000 mW
5 W 5,000 mW
6 W 6,000 mW
7 W 7,000 mW
8 W 8,000 mW
9 W 9,000 mW
10 W 10,000 mW
11 W 11,000 mW
12 W 12,000 mW
13 W 13,000 mW
14 W 14,000 mW
15 W 15,000 mW
16 W 16,000 mW
17 W 17,000 mW
18 W 18,000 mW
19 W 19,000 mW
20 W 20,000 mW
21 W 21,000 mW
22 W 22,000 mW
23 W 23,000 mW
24 W 24,000 mW
25 W 25,000 mW
26 W 26,000 mW
27 W 27,000 mW
28 W 28,000 mW
29 W 29,000 mW
30 W 30,000 mW
31 W 31,000 mW
32 W 32,000 mW
33 W 33,000 mW
34 W 34,000 mW
35 W 35,000 mW
36 W 36,000 mW
37 W 37,000 mW
38 W 38,000 mW
39 W 39,000 mW
40 W 40,000 mW

More Watt Power Conversions

SI Units
Convert to Microwatts
1 W is equal to 1,000,000 microwatts
Convert to Kilowatts
1 W is equal to 0.001 kilowatts
Convert to Megawatts
1 W is equal to 1.0E-6 megawatts
US Customary & Imperial Units
Convert to Mechanical Horsepower
1 W is equal to 0.001341 mechanical horsepower
Convert to Electric Horsepower
1 W is equal to 0.00134 electric horsepower
Convert to Btu Per Hour
1 W is equal to 3.412142 btu per hour
Other Units
Convert to Kilocalories Per Hour
1 W is equal to 0.860421 kilocalories per hour