How to convert milligrams to micrograms
µg = mg × 1,000Multiply the value in milligrams by 1,000. To go the other way, multiply by 0.001 (or divide by 1,000).
A milligram is larger than a microgram: one milligram contains 1,000 micrograms.
Worked examples
- 1 milligram1 mg × 1,000 = 1,000 µg
- 5 milligrams5 mg × 1,000 = 5,000 µg
- 10 milligrams10 mg × 1,000 = 10,000 µg
- 20 milligrams20 mg × 1,000 = 20,000 µg
- 100 milligrams100 mg × 1,000 = 100,000 µg
Milligrams to micrograms conversion table
Values are calculated by the conversion engine and rounded to 8 significant figures.
| Milligrams (mg) | Micrograms (µg) |
|---|---|
| 0.1 mg | 100 µg |
| 0.25 mg | 250 µg |
| 0.5 mg | 500 µg |
| 1 mg | 1,000 µg |
| 2 mg | 2,000 µg |
| 3 mg | 3,000 µg |
| 4 mg | 4,000 µg |
| 5 mg | 5,000 µg |
| 6 mg | 6,000 µg |
| 7 mg | 7,000 µg |
| 8 mg | 8,000 µg |
| 9 mg | 9,000 µg |
| 10 mg | 10,000 µg |
| Milligrams (mg) | Micrograms (µg) |
|---|---|
| 12 mg | 12,000 µg |
| 15 mg | 15,000 µg |
| 20 mg | 20,000 µg |
| 25 mg | 25,000 µg |
| 30 mg | 30,000 µg |
| 40 mg | 40,000 µg |
| 50 mg | 50,000 µg |
| 75 mg | 75,000 µg |
| 100 mg | 100,000 µg |
| 250 mg | 250,000 µg |
| 500 mg | 500,000 µg |
| 1,000 mg | 1,000,000 µg |
About the units
Milligram (mg)
One thousandth of a gram. Medication doses and vitamin contents are usually given in milligrams. One milligram equals 0.000001 kilograms (kg).
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).
Frequently asked questions
How many micrograms are in one milligram?
There are 1,000 micrograms in one milligram, and this value is exact by definition.
How do I convert milligrams to micrograms?
Multiply the number of milligrams by 1,000. For example, 10 mg × 1,000 = 10,000 µg.
How many milligrams are in one microgram?
One microgram equals 0.001 milligrams. That is the reverse factor, 1 ÷ 1,000.
What is 10 milligrams in micrograms?
10 mg = 10,000 µg.
Is this mg to µg 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.