how many mcg to mg
(mcg to mg) Conversion Calculator. 1 microgram (mcg) = 0.001 milligram (mg). Microgram (mcg) is a unit of Weight used in Metric system. Milligram (mg) is a unit of Weight used in Metric system. Micrograms also can be marked as Microgrammes or Âµg (alternative British English spelling in UK). Milligrams also can be marked as Milligrammes (alternative British English spelling in UK).