Milliwatt to Watt Converter
Convert Milliwatt (mW) to Watt (W) instantly. 1 mW = 0.001 W.
Power Converter
22 units available
1 mW = 0.001 W
Formula:
W = mW × 0.001With your value: 1 mW = 0.001 W
How big is that?
Everyday references on a logarithmic scale, all expressed in milliwatt so you can sanity-check the result.
Other Milliwatt to Watt conversions
Milliwatt to Watt Conversion Table
| Milliwatt (mW) | Watt (W) |
|---|---|
| 0.5 | 0.0005 |
| 1 | 0.001 |
| 2 | 0.002 |
| 5 | 0.005 |
| 10 | 0.01 |
| 15 | 0.015 |
| 20 | 0.02 |
| 25 | 0.025 |
| 50 | 0.05 |
| 100 | 0.1 |
| 250 | 0.25 |
| 500 | 0.5 |
| 1000 | 1 |
Watt to Milliwatt Conversion Table
| Watt (W) | Milliwatt (mW) |
|---|---|
| 0.5 | 500 |
| 1 | 1,000 |
| 2 | 2,000 |
| 5 | 5,000 |
| 10 | 10,000 |
| 15 | 15,000 |
| 20 | 20,000 |
| 25 | 25,000 |
| 50 | 50,000 |
| 100 | 100,000 |
| 250 | 250,000 |
| 500 | 500,000 |
| 1000 | 1,000,000 |
Where these values come from
Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.
Milliwatt (mW)
Power
Derived from the watt (1 W = 1 J/s).
Source: NIST Special Publication 811, Guide for the Use of the International System of Units
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
Watt (W)
Power
Derived from the watt (1 W = 1 J/s).
Source: NIST Special Publication 811, Guide for the Use of the International System of Units
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
How to Convert Milliwatt to Watt
To convert from Milliwatt (mW) to Watt (W), multiply the value by 0.001.
Formula: W = mW × 0.001
Reverse: mW = W × 1,000
Step-by-Step Example
- Start with your value in Milliwatt. For example: 5 mW
- Multiply by the conversion factor: 5 x 0.001
- The result is: 0.005 W
About Milliwatt
The milliwatt (mW) is a unit of power. One milliwatt equals 0.001 watts. UnitConvertLab converts it against every other power unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.
Common uses: power calculations, engineering and science, education.
About Watt
The watt (W) is a unit of power. One watt equals 1 watt. UnitConvertLab converts it against every other power unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.
Common uses: power calculations, engineering and science, education.
Frequently Asked Questions
How many Watt are in 1 Milliwatt?
There are exactly 0.001 Watt in 1 Milliwatt. This means the conversion factor from Milliwatt to Watt is 0.001.
What is the formula to convert Milliwatt to Watt?
The formula to convert Milliwatt to Watt is: W = mW × 0.001. For example, to convert 10 Milliwatt to Watt, you would multiply 10 by 0.001.
What is a Milliwatt?
The milliwatt (mW) is a unit of power. One milliwatt equals 0.001 watts. UnitConvertLab converts it against every other power unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.
What is a Watt?
The watt (W) is a unit of power. One watt equals 1 watt. UnitConvertLab converts it against every other power unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.
What are the common uses of Milliwatt?
The Milliwatt is commonly used in power calculations, engineering and science, education.
Related Power Conversions
Cite this page
UnitConvertLab. (2026). Milliwatt to Watt converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/milliwatt-to-watt