Formula
W to mW conversion formula
Use this relationship for a direct conversion:
mW = W x 1,000
Worked example
2 W = 2,000 mW.
Horsepower type is always identified because mechanical and metric horsepower differ by about 1.4 percent.
Power conversion
Convert Watt to Milliwatt
1 watt (W) equals 1,000 milliwatt (mW). Enter any value below to convert from W to mW.
Enter a value and choose units. Results update instantly.
1 W = 1,000 mW
All Power units
From 1 W| Unit | Value |
|---|---|
| Watt W | 1 |
| Kilowatt kW | 0.001 |
| Megawatt MW | 0.000001 |
| Milliwatt mW | 1,000 |
| Mechanical horsepower hp(I) | 0.0013410221 |
| Metric horsepower PS | 0.0013596216 |
| BTU (IT) per hour BTU/h | 3.4121416331 |
| Foot-pound per second ft·lb/s | 0.7375621493 |
Recent conversions
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Quick reference
Watt to Milliwatt table
| Watt (W) | Milliwatt (mW) |
|---|---|
| 0.01 | 10 |
| 0.1 | 100 |
| 1 | 1,000 |
| 2 | 2,000 |
| 5 | 5,000 |
| 10 | 10,000 |
| 25 | 25,000 |
| 50 | 50,000 |
| 100 | 100,000 |
| 1,000 | 1,000,000 |
From unit
About the watt
One joule per second.
Symbol: W
To unit
About the milliwatt
One thousandth of a watt.
Symbol: mW
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Related conversions
Source
Conversion standard
Definitions are checked against NIST SP 811: Power units. Calculations use full internal precision before display rounding.
View the complete power converterQuestions
W to mW FAQ
How do you convert watt to milliwatt?
Use the formula mW = W x 1,000. 1 watt (W) equals 1,000 milliwatt (mW).
Is the W to mW conversion exact?
Both unit definitions use exact factors. Only the displayed decimal may be rounded.