Micrograms to Milligrams Converter
One microgram equals 0.001 milligrams. To turn micrograms into milligrams, multiply by 0.001. So 400 mcg works out to 0.4 mg. Vitamin and medicine labels mix these two units constantly: a 400 mcg folic acid tablet is 0.4 mg. Mcg and µg mean the same thing.
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Your answer
400 mcg =0.4 mg
- 1 microgram
- 0.001 mg
- 1 milligram
- 1,000 mcg
The math behind it: Micrograms to Mg
milligrams = micrograms x 0.001
Going the other way? Divide by 0.001 instead, or multiply by 1,000, because one milligram is 1,000 micrograms.
Micrograms to milligrams chart
| Micrograms (mcg) | Milligrams (mg) |
|---|---|
| 1 | 0.001 |
| 10 | 0.01 |
| 25 | 0.025 |
| 50 | 0.05 |
| 100 | 0.1 |
| 250 | 0.25 |
| 400 | 0.4 |
| 500 | 0.5 |
| 1,000 | 1 |
| 5,000 | 5 |
Common questions
How many milligrams are in a microgram?
There are 0.001 milligrams in one microgram.
How many micrograms are in a milligram?
There are 1,000 micrograms in one milligram.
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