Micrograms to Milligrams
Convert micrograms (mcg) to milligrams (mg) instantly — with formula and reference table.
mcg
mg
Quick answer: 1 mcg = 0.001 mg. To convert micrograms to milligrams, multiply by mcg × 0.001.
Converting micrograms to milligrams
This converter changes a value in micrograms (mcg) into milligrams (mg). One microgram equals 0.001 mg. One milligram equals 1,000 micrograms, so converting micrograms to milligrams means dividing by 1,000. The conversion runs entirely in your browser — enter a value and the result updates instantly, in either direction.
Formula
mg = mcg × 0.001
Example
Convert 10 mcg to mg: 10 × 0.001 = 0.01 mg.
Micrograms to Milligrams conversion table
| Micrograms (mcg) | Milligrams (mg) |
|---|---|
| 1 mcg | 0.001 mg |
| 2 mcg | 0.002 mg |
| 3 mcg | 0.003 mg |
| 5 mcg | 0.005 mg |
| 10 mcg | 0.01 mg |
| 20 mcg | 0.02 mg |
| 25 mcg | 0.025 mg |
| 50 mcg | 0.05 mg |
| 100 mcg | 0.1 mg |
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How to use this converter
- Enter a value in the micrograms (mcg) field.
- Read the converted value in milligrams (mg) below.
- Type into the mg field instead to convert in reverse, or use the swap button.
Frequently asked questions
How many milligrams is 1,000 mcg?
1,000 micrograms equals exactly 1 mg.
How do I convert 500 mcg to mg?
500 divided by 1,000 = 0.5 mg.
Why are vitamins listed in mcg?
Many micronutrients are needed in tiny doses where milligrams would be unwieldy decimals.
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