Convert milligrams to grams
Converting milligrams to grams is a common weight task, whether you are checking a recipe, a spec sheet, a travel distance or a homework problem. Since 1 mg equals 0.001 g, the math is a single multiplication — and this page does it for you instantly, with the formula, a table of common values and answers to the questions people ask most.
Exact factor
How to convert milligrams to grams
To convert milligrams to grams, multiply the number of milligrams by 0.001. For example, 10 mg × 0.001 = 0.01 g.
g = mg × 0.001
- Write down the value in milligrams you want to convert.
- Multiply it by 0.001 (the exact mg→g factor).
- The result is your value in grams. Check it below with the converter or the table.
Conversion table
Common values of milligrams and their equivalents in grams:
| mg | g |
|---|---|
| 1 | 0.001 |
| 2 | 0.002 |
| 3 | 0.003 |
| 4 | 0.004 |
| 5 | 0.005 |
| 10 | 0.01 |
| 20 | 0.02 |
| 25 | 0.025 |
| 50 | 0.05 |
| 100 | 0.1 |
| 250 | 0.25 |
| 500 | 0.5 |
About these units
Milligram (mg). A milligram is one thousandth of a gram, used for medication doses, vitamins and chemical additives. Precision at this scale matters in pharmacology and nutrition labeling.
Gram (g). The gram is the metric unit for everyday small masses, defined as one thousandth of a kilogram. Recipes, nutrition labels and postage are commonly specified in grams.
Frequently asked questions
How do I convert milligrams to grams?
To convert milligrams to grams, multiply the number of milligrams by 0.001. For example, 10 mg × 0.001 = 0.01 g. Or skip the math: type the value into the converter at the top of this page and the result updates instantly.
How many grams are in 1 milligram?
1 mg = 0.001 g. That is the fixed relationship used by this converter and by international standards.
How many milligrams are in 1 gram?
1 g = 1,000 mg. If you are converting in the opposite direction, use our Gram to Milligram converter for the dedicated table and FAQ.
Is the milligrams to grams conversion exact?
Yes. Both units are defined by international agreement, so the factor of 0.001 is exact. Displayed results are rounded to 6 significant digits only for readability.
What is milligram used for?
A milligram is one thousandth of a gram, used for medication doses, vitamins and chemical additives. Precision at this scale matters in pharmacology and nutrition labeling.