Convert Milliwatts to Watts

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

Results in Watts:
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1 mW = 0.001 W
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How to Convert Milliwatts to Watts

To convert a milliwatt measurement to a watt measurement, multiply the power by the conversion ratio. One milliwatt is equal to 0.001 watts, so use this simple formula to convert:

watts = milliwatts × 0.001

The power in watts is equal to the milliwatts multiplied by 0.001.

For example, here's how to convert 5 milliwatts to watts using the formula above.
5 mW = (5 × 0.001) = 0.005 W

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


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.


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.

Milliwatt Measurements and Equivalent Watt Conversions

Common milliwatt values converted to the equivalent watt value
Milliwatts Watts
1 mW 0.001 W
2 mW 0.002 W
3 mW 0.003 W
4 mW 0.004 W
5 mW 0.005 W
6 mW 0.006 W
7 mW 0.007 W
8 mW 0.008 W
9 mW 0.009 W
10 mW 0.01 W
11 mW 0.011 W
12 mW 0.012 W
13 mW 0.013 W
14 mW 0.014 W
15 mW 0.015 W
16 mW 0.016 W
17 mW 0.017 W
18 mW 0.018 W
19 mW 0.019 W
20 mW 0.02 W
21 mW 0.021 W
22 mW 0.022 W
23 mW 0.023 W
24 mW 0.024 W
25 mW 0.025 W
26 mW 0.026 W
27 mW 0.027 W
28 mW 0.028 W
29 mW 0.029 W
30 mW 0.03 W
31 mW 0.031 W
32 mW 0.032 W
33 mW 0.033 W
34 mW 0.034 W
35 mW 0.035 W
36 mW 0.036 W
37 mW 0.037 W
38 mW 0.038 W
39 mW 0.039 W
40 mW 0.04 W

More Milliwatt Power Conversions

SI Units
Convert to Microwatts
1 mW is equal to 1,000 microwatts
Convert to Kilowatts
1 mW is equal to 1.0E-6 kilowatts
Convert to Megawatts
1 mW is equal to 1.0E-9 megawatts
US Customary & Imperial Units
Convert to Mechanical Horsepower
1 mW is equal to 1.341E-6 mechanical horsepower
Convert to Electric Horsepower
1 mW is equal to 1.3405E-6 electric horsepower
Convert to Btu Per Hour
1 mW is equal to 0.003412 btu per hour
Other Units
Convert to Kilocalories Per Hour
1 mW is equal to 0.00086 kilocalories per hour

Unit of Measurement Conversion Made Easy!

There are thousands of units of measure in use across the globe, and converting from one to another can be very difficult since each conversion requires a different formula to derive the result. Our unit of measurement conversion tools are meant to be dead easy. We break the mold of the typical dry and complicated experience. In addition to converting from one measurement to another, we provide the formula so you can see how the conversion is done, use it on you’re own calculator if you need to!

Convert units of length, weight, volume, and area between imperial and metric measures

Understanding the Metric System

The metric system makes it relatively easy to convert from one metric unit to another metric unit. The metric system uses a base unit, think meters or grams, and a prefix such as kilo or milli. The prefixes differ from the base units by differing powers of 10. So to convert within the metric system it’s usually a matter of multiplying or dividing by one of the powers of 10.

Here is a list of some of the common metric prefixes:

  • “kilo” – 1,000x larger
  • “hecto” – 100x larger
  • “deca” – 10x larger
  • “deci” – 10x smaller
  • “centi” – 100x smaller
  • “milli” – 1,000x smaller

There is a helpful mnemonic for remembering the prefixes: “King Henry Died Until Drinking Chocolate Milk.”
The u in Until refers to the base unit.