how many micrograms in a mg
1 milligram (mg) = 1000 microgram (mcg). Milligram (mg) is a unit of Weight used in Metric system. Microgram (mcg) is a unit of Weight used in Metric system.Milligrams also can be marked as Milligrammes (alternative British English spelling in UK).Micrograms also can be marked as Microgrammes or Âµg (alternative British English spelling in UK).illigram (mg) is a unit of Weight used in Metric system. Microgram (mcg) is a unit of Weight used in Metric system. Milligrams also can be marked as Milligrammes (alternative British English spelling in UK).