Milligram (mg)
One thousandth of a gram.
What is a milligram?
- Symbol
- mg
- Quantity
- Weight & Mass
- Unit system
- SI
- Definition
- One thousandth of a gram.
- Exact
- Yes, the value is exact by definition
- Source
- SI Brochure, 9th edition (BIPM, 2019)
Common applications
Used for medicine doses, nutrition labels (sodium, caffeine) and small laboratory samples.
Milligram in other weight & mass units
- 1 mg = 1000 µgMicrogram
- 1 mg = 0.001 gGram
- 1 mg = 0.000001 kgKilogram
- 1 mg = 1e-9 tTonne (metric ton)
- 1 mg = 0.005 ctCarat (metric)
- 1 mg ≈ 0.01543235835 grMilligram to Grain converter
- 1 mg ≈ 0.00003527396195 ozOunce
- 1 mg ≈ 0.000002204622622 lbPound
- 1 mg ≈ 1.102311311e-9 short tnShort ton (US ton)
- 1 mg ≈ 9.842065276e-10 long tnLong ton (UK ton)
Milligram quick reference
| Milligram | Grain | Kilogram | Pound |
|---|---|---|---|
| 1 mg | ≈ 0.01543235835 gr | = 0.000001 kg | ≈ 0.000002204622622 lb |
| 10 mg | ≈ 0.1543235835 gr | = 0.00001 kg | ≈ 0.00002204622622 lb |
| 100 mg | ≈ 1.543235835 gr | = 0.0001 kg | ≈ 0.0002204622622 lb |
| 1000 mg | ≈ 15.43235835 gr | = 0.001 kg | ≈ 0.002204622622 lb |
Where the milligram fits
The next smaller weight & mass unit is the microgram (µg). 1 mg = 1000 µg, and 1 µg = 0.001 mg.
The next larger weight & mass unit is the grain (gr). 1 mg ≈ 0.01543235835 gr, and 1 gr = 64.79891 mg.
Frequently asked questions
- How many grains are in one milligram?
- One milligram ≈ 0.01543235835 gr (grains).
- How many kilograms are in one milligram?
- One milligram = 0.000001 kg (kilograms).
- How many pounds are in one milligram?
- One milligram ≈ 0.000002204622622 lb (pounds).