μg to mg
A thousand micrograms make one milligram. Nutrients needed in tiny amounts — vitamin D, folate, B12 — are labelled in μg, while vitamin C and magnesium use mg.
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Common values
Formula
mg = μg × 0.001
mcg and μg are the same unit written two ways. Confusing either with mg is a thousandfold error, so read the label twice.
Frequently asked questions
QHow many mg is 1 μg?
1 μg is 0.001 mg, and 10 μg is 0.01 mg. Type any value in the box above to convert instantly.
QAnd how many μg is 1 mg?
1 mg is 1000 μg. This converter works both ways, so typing in the right box updates the left one.
QWhere is this unit used?
mcg and μg are the same unit written two ways. Confusing either with mg is a thousandfold error, so read the label twice.
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Traditional units (geun, doe, majigi and so on) vary by region and product.