How to convert grams to milligrams
One gram equals 1,000 milligrams. To convert, multiply the number of grams by 1,000:
Mental-math shortcut: Multiply grams by 1,000: 0.5 g = 500 mg.
Example
Convert 0.5 grams to milligrams: 0.5 g × 1,000 = 500 mg.
Grams to Milligrams conversion chart
| Grams (g) | Milligrams (mg) |
|---|---|
| 0.001 | 1 |
| 0.01 | 10 |
| 0.05 | 50 |
| 0.1 | 100 |
| 0.25 | 250 |
| 0.5 | 500 |
| 1 | 1,000 |
| 1.5 | 1,500 |
| 2 | 2,000 |
| 2.5 | 2,500 |
| 5 | 5,000 |
| 10 | 10,000 |
What is a gram?
A gram (g) is one thousandth of a kilogram — roughly the mass of a paper clip. Grams are used worldwide for food, recipes, nutrition labels and small objects. One ounce is about 28.35 grams.
What is a milligram?
A milligram (mg) is one thousandth of a gram, or one millionth of a kilogram. Milligrams are used for medicine doses, vitamins, supplements and nutrients such as sodium and caffeine on food labels. A typical cup of coffee contains about 95 mg of caffeine.
Converting the other way? Use the Milligrams to Grams converter.
Frequently asked questions
How many milligrams is one gram?
One gram is 1,000 milligrams.
How do I convert grams to milligrams?
Multiply the value in grams by 1,000. For example, 0.5 g × 1,000 = 500 mg.
What is 2 g in milligrams?
2 g is 2,000 milligrams.
How do I convert milligrams to grams?
Multiply milligrams by 0.001 (or divide by 1,000). You can also use our Milligrams to Grams converter.
Conversions use the internationally agreed definitions of each unit (for example, 1 inch = 2.54 cm exactly) and are rounded for display. Volume converters use US customary units unless stated otherwise.
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