1000 micrograms = 1 milligram so 400 mcg = 400/1000 milligrams = 0.4 milligrams. Simple!
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1 milligram = 0.001 gram400,000 milligrams = 400 grams
400
This is not a proper conversion. Cubic centimeters (cc) is a measure of volume. Grams (g), kilograms (kg) and milligrams (mg) are measures of weight or mass.
400
400