Watts to Milliwatts Converter

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


Result in Milliwatts:

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1,000 W = 1,000,000 mW

Do you want to convert milliwatts to watts?

How to Convert Watts to Milliwatts

To convert a measurement in watts to a measurement in milliwatts, multiply the power by the following conversion ratio: 1,000 milliwatts/watt.

Since one watt is equal to 1,000 milliwatts, you can use this simple formula to convert:

milliwatts = watts × 1,000

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

For example, here's how to convert 5 watts to milliwatts using the formula above.
milliwatts = (5 W × 1,000) = 5,000 mW
conversion scale showing watts and equivalent milliwatts power values

How Many Milliwatts Are in a Watt?

There are 1,000 milliwatts in a watt, which is why we use this value in the formula above.

1 W = 1,000 mW

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

What Is a Watt?

One watt is the power equal to the rate of energy of one joule per second in an electrical circuit.[1] 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.

Learn more about watts.

What Is a Milliwatt?

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 thousandths, or 10-3. Milliwatts can be abbreviated as mW; for example, 1 milliwatt can be written as 1 mW.

Learn more about milliwatts.

Watt to Milliwatt Conversion Table

Table showing various watt measurements converted to milliwatts.
Watts Milliwatts
0.001 W 1 mW
0.002 W 2 mW
0.003 W 3 mW
0.004 W 4 mW
0.005 W 5 mW
0.006 W 6 mW
0.007 W 7 mW
0.008 W 8 mW
0.009 W 9 mW
0.01 W 10 mW
0.02 W 20 mW
0.03 W 30 mW
0.04 W 40 mW
0.05 W 50 mW
0.06 W 60 mW
0.07 W 70 mW
0.08 W 80 mW
0.09 W 90 mW
0.1 W 100 mW
0.2 W 200 mW
0.3 W 300 mW
0.4 W 400 mW
0.5 W 500 mW
0.6 W 600 mW
0.7 W 700 mW
0.8 W 800 mW
0.9 W 900 mW
1 W 1,000 mW


  1. International Bureau of Weights and Measures, The International System of Units, 9th Edition, 2019, https://www.bipm.org/documents/20126/41483022/SI-Brochure-9-EN.pdf

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