**Milligrams to grams (mg to g)** mass units conversion factor is 0.001. To find out how many grams in milligrams, multiply the milligram value by 0.001 or use the converter.

**1 Milligram = 0.001 Gram**

In metric system, the prefix "**milli**" means "**one thousandth of**", that makes easier to remember how to convert from milligrams to grams, because if you replace the "**milli**" with "**1000**" in word "milligram", 1 milligram means 1000^{th} of a gram (or 1 gram = 1000 milligrams).

For example, to find out how many grams in 250 milligrams, multiply the milligram value by the conversion factor, 250 mg * 0.001 (g in 1 mg) = 0.25 (1/4) gram in 250 mg.

**Milligram** is a unit of mass in metric system and it is mostly used in medicine. There are 28349.5 mg in an ounce. The abbreviation for milligram is "**mg**".

**Gram** is a metric system unit of mass. It is one thousandth (1/1000) of the kilogram that is the metric system base unit. There is 1 milliliter (mL) in 1 gram of water. The abbreviation of gram is "**g**".