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 divide by 1000).
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".