Milligrams to Micrograms converter

To convert milligrams to micrograms, enter the value in the first field. The result in micrograms is calculated automatically using the exact conversion factor.

1 mg = 1000 µg
1 µg = 0.001 mg

Formula: µg = mg × 1000
mg = µg × 0.001

Definitions: 1 mg = 0.001 g; 1 µg = 0.001 mg

The milligram (mg) is one thousandth of a gram. It is the standard unit for doses of medicines and supplements, and for nutrients such as sodium and caffeine on food labels.

The microgram (µg) is one millionth of a gram. It is used for very small doses of medicines and vitamins, such as vitamin B12 and folate, and for trace amounts in laboratory and environmental analysis.

See the conversion table with commonly used values, handy for quick reference or study.