Watts to milliwatts converter
Milliwatts (mW)
1 watt = 1,000 milliwatts
How to convert watts to milliwatts
mW = W × 1000
Multiply the number of watts by 1000 to get milliwatts. Going the other way, divide by 1000 (or multiply by 0.001).
One watt is exactly defined as 1000 milliwatts (to 12 significant figures), and one milliwatt is 0.001 watts.
Worked examples
- Convert 5 watts: 5 × 1000 = 5,000 5,000 milliwatts.
- Convert 12.5 watts: 12.5 × 1000 = 12,500 12,500 milliwatts.
- Convert 250 watts: 250 × 1000 = 250,000 250,000 milliwatts.
Quick-reference table
| W | mW |
|---|---|
| 1 | 1,000 |
| 2 | 2,000 |
| 3 | 3,000 |
| 5 | 5,000 |
| 10 | 10,000 |
| 15 | 15,000 |
| 20 | 20,000 |
| 25 | 25,000 |
| 50 | 50,000 |
| 75 | 75,000 |
| 100 | 100,000 |
| 1,000 | 1,000,000 |
| mW | W |
|---|---|
| 1 | 0.001 |
| 2 | 0.002 |
| 3 | 0.003 |
| 5 | 0.005 |
| 10 | 0.01 |
| 15 | 0.015 |
| 20 | 0.02 |
| 25 | 0.025 |
| 50 | 0.05 |
| 75 | 0.075 |
| 100 | 0.1 |
| 1,000 | 1 |
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Frequently asked questions
How many milliwatts are in 1 watt?
1 watt equals 1,000 milliwatts.
What is the formula to convert watts to milliwatts?
Use mW = W × 1000. Multiply the number of watts by 1000 to get milliwatts. Going the other way, divide by 1000 (or multiply by 0.001).
What is 100 watts in milliwatts?
100 watts is 100,000 milliwatts.