3 mg equals 3,000 mcg.
1 mg is 1/1000th of a gram; 750 mg is .75 (or 3/4) of a gram.
mcg is an abbreviation of microgram, so 1 mg = 1000 microgram = 1000 mcg.
1 milligram (mg) = 1 000 micrograms (mcg)Therefore:0.001 mg = 1 mcg
1 milligram = 1000 micrograms. You now have all the information required to work out, for yourself, the answer to this and similar questions.