how many grams per mg
Grams to mg âº. 1 milligram (mg) is equal to 1/1000 grams (g). 1 mg = (1/1000) g = 0.001 g. The mass m in grams (g) is equal to the mass m in milligrams (mg) divided by 1000: m(g) = m(mg) / 1000. Convert 5mg to grams: m(g) = 5 mg / 1000 = 0.005 g.