Micrograms to Milligrams
A microgram is one millionth of a gram, used to measure doses of vitamins, hormones, and trace medications. A milligram is one thousandth of a gram, the standard unit for medication dosages on drug labels. 1 µg equals 0.001 mg, so converting between them is a matter of multiplying by that fixed factor — type any value into the converter below and both sides update instantly as you type.
Both units belong to mass, measured here against mass's base unit (kg) — every other mass unit on this site converts through that same reference point, which is why the table below can also be read as a quick cross-check against nearby values.
Formula
mg = µg × 0.001
µg = mg × 1,000
Worked example: 5 µg × 0.001 = 0.005 mg.
Conversion table
| Microgram (µg) | Milligram (mg) |
|---|---|
| 1 µg | 0.001 mg |
| 2 µg | 0.002 mg |
| 3 µg | 0.003 mg |
| 5 µg | 0.005 mg |
| 10 µg | 0.01 mg |
| 20 µg | 0.02 mg |
| 25 µg | 0.025 mg |
| 50 µg | 0.05 mg |
| 100 µg | 0.1 mg |
| 250 µg | 0.25 mg |
| 500 µg | 0.5 mg |
| 1,000 µg | 1 mg |
Frequently asked
- How many Milligrams in a microgram?
- 1 µg equals 0.001 mg.
- How do I convert Micrograms to Milligrams?
- Multiply the value in µg by 0.001 to get mg. The converter above does this instantly as you type.
- Is the conversion exact?
- Yes — Microgram and Milligram are both defined by a fixed conversion factor to mass's base unit (kg), so the result shown is exact to the precision displayed, not an approximation.