Convert Micrograms to Milligrams
1 microgram is 0.001 mg. One microgram is exactly 0.001 milligrams.
One microgram is 0.001 milligrams. To convert micrograms to milligrams, multiply by 0.001; to go the other way, divide by 0.001 or multiply by 1000. The factor is exact rather than rounded: it follows from NIST Handbook 44. One millionth of a gram.
Factor checked against the defining standard · How we check
Milligrams
0.001 mg
- Micrograms × 0.001
value * 0.0010.001 mg
1 microgram in every weight unit
| Unit | Value | Exact factor |
|---|---|---|
| ounces | 0.00000003527396195 oz | × 0.0000000352739619496 |
| pounds | 0.000000002204622622 lb | × 0.00000000220462262185 |
| stone | 0.0000000001574730444 st | × 0.000000000157473044418 |
| US tons | 0.000000000001102311311 ton | × 0.00000000000110231131092 |
| micrograms (as entered) | 1 mcg | — |
| milligrams | 0.001 mg | × 0.001 |
| grams | 0.000001 g | × 0.000001 |
| kilograms | 0.000000001 kg | × 0.000000001 |
| tonnes | 0.000000000001 t | × 0.000000000001 |
Factors are entered by hand from NIST Handbook 44 rather than derived from a units library, so the ones that terminate are exact rather than rounded.
How do you convert micrograms to milligrams?
- 1.Take the measurement in micrograms.
- 2.Multiply by 0.001 — that is how many milligrams fit in one microgram.
- 3.To go back the other way, divide by 0.001, or multiply by 1000.
Micrograms to milligrams conversion table
| Micrograms | Milligrams |
|---|---|
| 1 mcg | 0.001 mg |
| 2 mcg | 0.002 mg |
| 3 mcg | 0.003 mg |
| 4 mcg | 0.004 mg |
| 5 mcg | 0.005 mg |
| 6 mcg | 0.006 mg |
| 7 mcg | 0.007 mg |
| 8 mcg | 0.008 mg |
| 9 mcg | 0.009 mg |
| 10 mcg | 0.01 mg |
| 12 mcg | 0.012 mg |
| 15 mcg | 0.015 mg |
| 20 mcg | 0.02 mg |
| 25 mcg | 0.025 mg |
| 50 mcg | 0.05 mg |
| 100 mcg | 0.1 mg |
What are micrograms and milligrams?
- Microgram (mcg)
- One millionth of a gram. Written mcg rather than µg on labels deliberately: the Greek letter is the character most often lost in transcription, and a factor of a thousand in a dose is not a rounding error.
- Milligram (mg)
- One thousandth of a gram, and exactly 1,000 micrograms. The unit almost every medicine is dosed in.
Questions people actually ask
- How many milligrams are in a microgram?
- 0.001. One thousandth of a gram, and exactly 1,000 micrograms. The unit almost every medicine is dosed in.
- How do I convert milligrams back to micrograms?
- Divide by 0.001, or multiply by 1000 — they are the same operation.
Other weight conversions
Milligrams to micrograms — the same conversion the other way.