One gram is equal to 1,000 milligrams. The conversion factor for grams to milligrams is 1,000, so to determine the number of milligrams from grams, simply multiply the number of grams by 1,000.
Grams and milligrams are both units of mass in the metric system. The abbreviation for the gram is "g," while the abbreviation for milligram is "mg." Grams are a very common unit of measurement used in everyday life, and milligrams are typically used for smaller units of mass such as with medications and in pharmacies. The kilogram is another common unit of mass. One kilogram equals 1,000 grams, so to determine the number of kilograms from grams, divide the number of grams by 1,000.