How to convert grams to milligrams
Grams and Milligrams both measure weight, so converting is a single multiplication. One g equals 1,000 mg, so you multiply your grams value by 1,000.
Formula: milligrams = grams × 1,000. For example, 10 g = 10,000 mg.
Grams to Milligrams conversion table
| Grams (g) | Milligrams (mg) |
|---|---|
| 1 | 1,000 |
| 2 | 2,000 |
| 5 | 5,000 |
| 10 | 10,000 |
| 25 | 25,000 |
| 50 | 50,000 |
| 100 | 100,000 |
| 1,000 | 1,000,000 |
Grams and Milligrams explained
Grams (g): The base metric unit of mass, used for food, ingredients and small items.
Milligrams (mg): One-thousandth of a gram, used for medication doses and nutrition labels.
When you'd convert grams to milligrams
You'll convert grams to milligrams whenever a measurement is given in one unit but you need it in the other — comparing grams and milligrams figures across regions, following a recipe or spec, or double-checking a number. Because 1 g is exactly 1,000 mg, the result is precise every time.
Frequently asked questions
How many milligrams are in a gram?
One g equals 1,000 mg. Multiply your grams figure by 1,000 to get milligrams.
What is the formula to convert grams to milligrams?
milligrams = grams × 1,000. The factor 1,000 is exact.
What is 2 grams in milligrams?
2 g = 2,000 mg. You can enter any value in the converter above to get an instant result.
Is this Grams to Milligrams converter accurate?
Yes. It uses the standard conversion factor (1 g = 1,000 mg) defined by BIPM — SI Brochure (definition of the kilogram), so results are exact to several decimal places.