There are 1000 micrograms in one milligram.
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There are 1,000 mcg in 1 milligram (mg).1 microgram = 0.001 milligrams
0.001 a milligram is 1,000 of a gram, 1 microgram is 1,000,000th of a gram.
1 milligram has 1,000 micrograms in it. That's why it's the bigger one.
One milligram is 1000 micrograms. 0.001 milligrams is equal to 1 microgram. The table on the wikipedia page for the "gram" shows relation of many of these units. http://en.wikipedia.org/wiki/Gram
0.001 grams equals 1 milligrams (mg). And 0.001 milligrams in 1 microgram (mg), therefore 0.000001 grams (or 1 x 10-6) in 1 microgram. There are therefore 100,000 micrograms in a gram and in context 1000 milligrams in a gram.