mg to mcg converter
One milligram is exactly 1,000 micrograms. This is the conversion behind most dosing arithmetic — and most dosing mistakes.
1 mg = 1,000 mcg. Type in either box — the other updates.
Quick reference
| Milligrams (mg) | Micrograms (mcg) |
|---|---|
| 0.1 mg | 100 mcg |
| 0.25 mg | 250 mcg |
| 0.5 mg | 500 mcg |
| 1 mg | 1,000 mcg |
| 2 mg | 2,000 mcg |
| 2.5 mg | 2,500 mcg |
| 5 mg | 5,000 mcg |
| 10 mg | 10,000 mcg |
Vial labels are usually printed in mg; doses are often quoted in mcg. Mixing the two up shifts a number by a factor of 1,000 — the classic "10× or 1,000× error." When in doubt, convert everything to mcg before doing any other arithmetic. Read the full mg vs mcg guide.