Milliwatts to Watts Converter
Convert milliwatt to watt instantly. 1 mW = 0.001 W, worked steps and a full reference table.
How to use it
- Type the value in milliwatt — the result updates as you type.
- Use Swap to flip the direction, or change either dropdown to convert between any two units.
- Click the result to copy it. The URL updates too, so you can bookmark or share the exact conversion.
Examples
| 1 mW | 0.001 W |
| 5 mW | 0.005 W |
| 10 mW | 0.01 W |
| 100 mW | 0.1 W |
One milliwatt equals 0.001 watts (W). To convert milliwatts to watts, multiply by 0.001; to go back the other way, multiply by 1000 instead.
The converter above does it as you type and shows the working underneath, so you can check the arithmetic rather than take the number on trust.
What milliwatts and watts actually measure
Milliwatt (mW) — A milliwatt is a thousandth of a watt. Laser pointers, radio transmit power and low-power electronics.
Watt (W) — The watt is the SI unit of power — one joule per second. Light bulbs, appliances, audio equipment and solar panels.
Milliwatts to Watts conversion table
The most common values, worked out in advance. Anything not listed can be typed straight into the converter.
| mW | W |
|---|---|
| 1 mW | 0.001 W |
| 2 mW | 0.002 W |
| 5 mW | 0.005 W |
| 10 mW | 0.01 W |
| 25 mW | 0.025 W |
| 50 mW | 0.05 W |
| 100 mW | 0.1 W |
How to convert milliwatts to watts by hand
Multiply the number of milliwatts by 0.001.
For example, 25 mW × 0.001 = 0.025 W.
Going the other way, divide by 0.001 — or multiply by 1000, which is the same thing and easier to do in your head.
Everything runs in your browser
There is no server involved in the calculation. The numbers you type never leave your device, nothing is logged, and the page keeps working with no connection once it has loaded. That is not a marketing line — it is simply how the tool is built, because a calculation like this has no reason to touch a network.
Questions people ask
How many W are in 1 mW?
1 mW equals exactly 0.001 W. Multiply any value in milliwatt by 0.001 to get watt.
Is anything uploaded to a server?
No. The whole calculation happens in your browser. Nothing is sent anywhere, and the page keeps working offline once loaded.
Last updated 18 August 2026