How to convert milliwatts to watts
W = mW × 0.001Multiply the value in milliwatts by 0.001. To go the other way, multiply by 1,000 (or divide by 0.001).
A milliwatt is smaller than a watt: it takes 1,000 milliwatts to make one watt.
Worked examples
- 1 milliwatt1 mW × 0.001 = 0.001 W
- 5 milliwatts5 mW × 0.001 = 0.005 W
- 10 milliwatts10 mW × 0.001 = 0.01 W
- 20 milliwatts20 mW × 0.001 = 0.02 W
- 100 milliwatts100 mW × 0.001 = 0.1 W
Milliwatts to watts conversion table
Values are calculated by the conversion engine and rounded to 8 significant figures.
| Milliwatts (mW) | Watts (W) |
|---|---|
| 0.1 mW | 0.0001 W |
| 0.25 mW | 0.00025 W |
| 0.5 mW | 0.0005 W |
| 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 |
| Milliwatts (mW) | Watts (W) |
|---|---|
| 12 mW | 0.012 W |
| 15 mW | 0.015 W |
| 20 mW | 0.02 W |
| 25 mW | 0.025 W |
| 30 mW | 0.03 W |
| 40 mW | 0.04 W |
| 50 mW | 0.05 W |
| 75 mW | 0.075 W |
| 100 mW | 0.1 W |
| 250 mW | 0.25 W |
| 500 mW | 0.5 W |
| 1,000 mW | 1 W |
About the units
Milliwatt (mW)
The milliwatt (mW) is a unit of power level (dbm, dbw) in the International System of Units (SI). One milliwatt equals 0.001 watts (W).
Watt (W)
The watt (W) is a unit of power level (dbm, dbw) in the International System of Units (SI).
Frequently asked questions
How many watts are in one milliwatt?
There are 0.001 watts in one milliwatt, and this value is exact by definition.
How do I convert milliwatts to watts?
Multiply the number of milliwatts by 0.001. For example, 10 mW × 0.001 = 0.01 W.
How many milliwatts are in one watt?
One watt equals 1,000 milliwatts. That is the reverse factor, 1 ÷ 0.001.
What is 10 milliwatts in watts?
10 mW = 0.01 W.
Is this mW to W converter accurate?
Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.