Now that would depend on your units wouldn't it?
If you are talking about IU (International Units) used to measure vitamins and medicines then you should know that the IU depends on the activity of the substance and the molecular weight will differ from one substance to another.
1 mg equals how many grams?
1000 mcg equals 1 mg.
1000 mcg equals 1 mg.
1000 mg equals 1 gm
1 milligram (mg) is equal to 0.001 units.
mg equals milligrams so that means it is one thousandths of a milligram
1000 mg, for every 1000 mg equals 1 g.
1 kg = 1,000,000 mg
100,000
10 mg = 1 cg -> 1 mg = 1/10 cg -> 250 mg = 25 cg
1 g = 1000 mg 455 g =455,000 mg
1 g = 1,000 mg 5 g = 5,000 mg