Milligram vs. Microgram

Milligramnoun

An SI unit of mass, equivalent to one thousandth of a gram. Symbol: mg

Milligramnoun

A measure of weight, in the metric system, being the thousandth part of a gram, equal to the weight of a cubic millimeter of water, or .01543 of a grain avoirdupois.

Milligramnoun

one thousandth (1/1,000) gram

Microgramnoun

A unit of mass equal to one millionth of a gram, or 0.000 001 grams (symbol: μg or mcg).

Microgramnoun

one millionth (1/1,000,000) gram

Microgram

In the metric system, a microgram or microgramme is a unit of mass equal to one millionth (1×10−6) of a gram. The unit symbol is μg according to the International System of Units; the recommended symbol in the United States and United Kingdom when communicating medical information is mcg.