Convert Watts to Milliwatts
Convert watts to milliwatts instantly. Type a value below, check the formula and table, then see how the same W to mW conversion looks as a single line in Notes Calculator.
Watts to Milliwatts formula
One watt is 1,000 milliwatts, so mW = W × 1,000. For the reverse, multiply milliwatts by 0.001, or use the Milliwatts to Watts converter.
Watts to Milliwatts conversion table
| Watts (W) | Milliwatts (mW) |
|---|---|
| 1 | 1,000 |
| 2 | 2,000 |
| 5 | 5,000 |
| 10 | 10,000 |
| 20 | 20,000 |
| 25 | 25,000 |
| 50 | 50,000 |
| 100 | 100,000 |
| 250 | 250,000 |
| 500 | 500,000 |
| 1,000 | 1,000,000 |
Watts to Milliwatts in Notes Calculator
Notes Calculator is a notepad that does math. Write 100 W to mW on any line and the answer appears beside it. Change the number and the result follows. The same works with in and as, and with values stored in variables, so a whole estimate can mix watts and milliwatts without a separate converter.
| Note | Result |
|---|---|
| 100 W to mW | 100,000 mW |
| 100 W in mW | 100,000 mW |
| 10 mW as W | 0.01 W |
See the unit conversion docs for mixing units in one expression, or open the free web app and try it.
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FAQ
Frequently asked questions
- One watt equals 1,000 milliwatts. To convert watts to milliwatts, multiply by 1,000; to go back, multiply by 0.001.
- Type the value, the unit, and the target unit on one line: 100 W to mW. The keywords to, in, and as all work, and the result updates as you type. You can also keep the value in a variable and convert it later.
- Yes. The converter on this page is free, and Notes Calculator has a free plan for the web, Mac, Windows, Linux, and Android with the same unit conversions built in.
How many milliwatts are in one watt?
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