How to convert milligrams to grams
One milligram equals 0.001 grams. To convert, multiply the number of milligrams by 0.001 (or divide by 1,000):
Mental-math shortcut: Divide milligrams by 1,000 (move the decimal point three places left): 500 mg = 0.5 g.
Example
Convert 500 milligrams to grams: 500 mg × 0.001 = 0.5 g.
Milligrams to Grams conversion chart
| Milligrams (mg) | Grams (g) |
|---|---|
| 1 | 0.001 |
| 5 | 0.005 |
| 10 | 0.01 |
| 25 | 0.025 |
| 50 | 0.05 |
| 100 | 0.1 |
| 200 | 0.2 |
| 250 | 0.25 |
| 325 | 0.325 |
| 400 | 0.4 |
| 500 | 0.5 |
| 750 | 0.75 |
| 1,000 | 1 |
| 2,000 | 2 |
| 5,000 | 5 |
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.
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.
Converting the other way? Use the Grams to Milligrams converter.
Frequently asked questions
How many grams is one milligram?
One milligram is 0.001 grams.
How do I convert milligrams to grams?
Multiply the value in milligrams by 0.001. For example, 500 mg × 0.001 = 0.5 g.
What is 1,000 mg in grams?
1,000 mg is 1 grams.
How do I convert grams to milligrams?
Multiply grams by 1,000 (or divide by 0.001). You can also use our Grams to Milligrams converter.
Is mg the same as mL?
No. Milligrams measure mass and milliliters measure volume. One mL of water weighs about 1 gram (1,000 mg), but for medicines the amount of drug in each mL depends on the concentration printed on the label.
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.
Last updated: