Direct conversion
Convert watt [W] to milliwatt [mW] instantly with formula, examples, chart, and FAQs.
1 watt [W] = 1000 milliwatt [mW]
1 watt [W] = 1000 milliwatt [mW]
Example: 1 watt [W] equals 1000 milliwatt [mW].
Power conversions use watt as the reference unit and include mechanical horsepower, electrical power, and heat-rate units.
Displayed results are rounded for readability. The calculator keeps enough precision for everyday use and switches to scientific notation for very large or very small values. Last reviewed: 2026-08-14.
The watt is the SI derived unit of power equal to one joule per second.
HistoryThe watt is named after James Watt and became the standard unit for power output and consumption.
Current useWatts are used for appliances, electronics, lighting, motors, solar panels, and power ratings.
The milliwatt (mW) is a power unit used to express measurements in this converter.
HistoryThis unit is included because it appears in practical measurement systems, technical references, product specifications, or everyday conversion needs.
Current useUse milliwatt when comparing power values, checking specifications, converting between systems, or preparing quick estimates.
| watt [W] | milliwatt [mW] |
|---|---|
| 1 | 1000 |
| 2 | 2000 |
| 5 | 5000 |
| 10 | 10000 |
| 20 | 20000 |
| 25 | 25000 |
| 50 | 50000 |
| 100 | 100000 |
| 1000 | 1000000 |
Use this formula: 1 watt [W] = 1000 milliwatt [mW] Enter your value in the calculator and the result updates instantly.
1 watt [W] equals 1000 milliwatt [mW].
Yes. Use the swap button in the calculator or open the related reverse conversion link when it is listed on this page.