There are 1000 micrograms in a milligram. Therefore you multiply by 1000 to convert. Therefore there are 1,000,000 micrograms in 1000 milligrams.
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1,000,000 micrograms = 1 gram4,630 micrograms = 0.004630 gram
2000mcg = 2000 micrograms
445 micrograms = 0.445 milligrams 445 milligrams = 445,000 micrograms
In a milligram, there are 1000 micrograms. Here you have to multiply by 1000. 0.112mg is 112 micrograms.
0.23 micrograms = 0.00023 milligrams