The international unit (IU) is not a measure of mass but only a measure of the drug effect.
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There are 10 micrograms in 400 IU of vitamin D. Converting micrograms to milligrams, there are 0.01 milligrams in 10 micrograms. Therefore, 400 IU is equal to 0.4 milligrams.
There are 400 mcg in 0.4 mg. To convert milligrams (mg) to micrograms (mcg), you multiply by 1000 since 1 mg is equal to 1000 mcg.
There are 0.4 kg in 400 mg. You can convert milligrams to kilograms by dividing the number of milligrams by 1,000.
There are 1000 micrograms in a milligram. Therefore, you need to multiply by 1000. 400*1000 is 400,000 micrograms.
400 ounces is equivalent to 25 pounds.