How to convert micrograms to milligrams
mg = µg × 0.001Multiply the value in micrograms by 0.001. To go the other way, multiply by 1,000 (or divide by 0.001).
A microgram is smaller than a milligram: it takes 1,000 micrograms to make one milligram.
Worked examples
- 1 microgram1 µg × 0.001 = 0.001 mg
- 5 micrograms5 µg × 0.001 = 0.005 mg
- 10 micrograms10 µg × 0.001 = 0.01 mg
- 20 micrograms20 µg × 0.001 = 0.02 mg
- 100 micrograms100 µg × 0.001 = 0.1 mg
Micrograms to milligrams conversion table
Values are calculated by the conversion engine and rounded to 8 significant figures.
| Micrograms (µg) | Milligrams (mg) |
|---|---|
| 0.1 µg | 0.0001 mg |
| 0.25 µg | 0.00025 mg |
| 0.5 µg | 0.0005 mg |
| 1 µg | 0.001 mg |
| 2 µg | 0.002 mg |
| 3 µg | 0.003 mg |
| 4 µg | 0.004 mg |
| 5 µg | 0.005 mg |
| 6 µg | 0.006 mg |
| 7 µg | 0.007 mg |
| 8 µg | 0.008 mg |
| 9 µg | 0.009 mg |
| 10 µg | 0.01 mg |
| Micrograms (µg) | Milligrams (mg) |
|---|---|
| 12 µg | 0.012 mg |
| 15 µg | 0.015 mg |
| 20 µg | 0.02 mg |
| 25 µg | 0.025 mg |
| 30 µg | 0.03 mg |
| 40 µg | 0.04 mg |
| 50 µg | 0.05 mg |
| 75 µg | 0.075 mg |
| 100 µg | 0.1 mg |
| 250 µg | 0.25 mg |
| 500 µg | 0.5 mg |
| 1,000 µg | 1 mg |
About the units
Microgram (µg)
One millionth of a gram, often written “mcg” on supplement labels to avoid confusion with mg. One microgram equals 1×10⁻⁹ kilograms (kg).
Milligram (mg)
One thousandth of a gram. Medication doses and vitamin contents are usually given in milligrams. One milligram equals 0.000001 kilograms (kg).
Frequently asked questions
How many milligrams are in one microgram?
There are 0.001 milligrams in one microgram, and this value is exact by definition.
How do I convert micrograms to milligrams?
Multiply the number of micrograms by 0.001. For example, 10 µg × 0.001 = 0.01 mg.
How many micrograms are in one milligram?
One milligram equals 1,000 micrograms. That is the reverse factor, 1 ÷ 0.001.
What is 10 micrograms in milligrams?
10 µg = 0.01 mg.
Is this µg to mg converter accurate?
Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.