watt to milliwatt converter

Convert watt to milliwatt in the Power family. See a sample calculation, unit definitions, and the interactive converter.

Example conversion: 1 W

1000 milliwatt

This example is calculated from the same unit registry used by the interactive converter.

Formula and unit definitions

Convert mechanical, electrical, thermal and metric power units.

target value = source value × source factor ÷ target factor

Source unit: watt (W), factor 1, offset 0.

Target unit: milliwatt (mW), factor 0.001, offset 0.

Open live converter ↗

Important note

The calculation is performed locally from the listed unit definitions. Display results are rounded for readability; high-precision and regulated work should use the governing standard and appropriate significant figures.

For high-precision, regulated or safety-critical use, check the underlying standard and its required precision. Historical and approximate units are identified in their names or family descriptions.

Browse this category ↗