mg: Abbreviation for milligram, a unit of measurement of mass in the metric system equal to a thousandth of a gram. A gram is equal to the mass of one milliliter, one thousandth of a liter, of water at 4 degrees C. MG (in capital letters) is the abbreviation for the disease myasthenia gravis.

What does 1mg mean?

1 mg = 0.001 g (one milligram is one one-thousandth part of a gram)

How many mg is a milligram?

Milligram and International Unit Difference

There is 2 Important Difference Between Milligram and International Unit. In the metric system, 1000 milligrams (mg) is a unit of mass equal to 1 gram and 1000 micrograms (mcg) is equal to 1 milligram (mg) and will be the same no matter what you're measuring.