MCG to MG Converter
Convert micrograms (mcg) to milligrams (mg) instantly. Type a value — the result updates as you type, and the swap button converts the other way.
mcg to mg formula
mg = mcg ÷ 1000
1 microgram = 0.001 milligrams · 1 milligram = 1000 micrograms
To convert micrograms to milligrams, divide the value by 1000. For example, 1000 mcg:
mg = 1000 ÷ 1000mg = 1
So 1000 mcg = 1 mg.
Mental math shortcut
This conversion is exact, so there is no need to estimate: just divide by 1,000.
mcg to mg conversion table
mg back to mcg
The same values converted the other way, rounded for everyday use:
| Milligrams | Micrograms |
|---|---|
| 0.01 mg | 10 mcg |
| 0.05 mg | 50 mcg |
| 0.1 mg | 100 mcg |
| 0.25 mg | 250 mcg |
| 0.5 mg | 500 mcg |
| 1 mg | 1000 mcg |
| 2.5 mg | 2500 mcg |
| 5 mg | 5000 mcg |
About the units
Micrograms (mcg)
A microgram (mcg or µg) is one millionth of a gram, or one thousandth of a milligram. Vitamin D, B12 and folate doses are often given in micrograms.
Milligrams (mg)
A milligram is one thousandth of a gram. Medicine doses, vitamins and nutrition labels commonly use milligrams.
Frequently asked questions
How many milligrams are in a microgram?
One microgram equals 0.001 milligrams.
What is 1000 mcg in mg?
1000 mcg = 1 mg.
How do I convert mg back to mcg?
Multiply the milligrams by 1000.