Convert g to mg instantly — formula, worked examples and a conversion table of common values.
Convert grams (g) to milligrams (mg). Enter a value on either side and the other updates instantly — nothing is sent to a server.
One gram equals 1,000 mg. The table below lists the values people look up most often, and each one links to a page with the worked calculation.
mg = g × 1,000| Gram (g) | Milligram (mg) |
|---|---|
| 0.1 | 100 |
| 0.5 | 500 |
| 1 | 1,000 |
| 2 | 2,000 |
| 3 | 3,000 |
| 5 | 5,000 |
| 10 | 10,000 |
| 15 | 15,000 |
| 20 | 20,000 |
| 25 | 25,000 |
| 50 | 50,000 |
| 75 | 75,000 |
| 100 | 100,000 |
| 250 | 250,000 |
| 500 | 500,000 |
| 1,000 | 1,000,000 |
1 gram = 1,000 mg.
10 g = 10,000 mg.
100 g = 100,000 mg.
Use the formula mg = g × 1,000. Or type any value into the converter above — it works in both directions.