Depends upon the density of the subject (microgram is a unit of mass, mililitre is a unit of volume).
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There are 1000 micrograms in one milligram. Therefore, 0.9 milligrams is equal to 0.9 x 1000 = 900 micrograms.
1
1,000,000 micrograms = 1 gram4,630 micrograms = 0.004630 gram
2000mcg = 2000 micrograms
445 micrograms = 0.445 milligrams 445 milligrams = 445,000 micrograms