Convert grams to milligrams
Converting grams to milligrams is a common weight task, whether you are checking a recipe, a spec sheet, a travel distance or a homework problem. Since 1 g equals 1,000 mg, 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 grams to milligrams
To convert grams to milligrams, multiply the number of grams by 1,000. For example, 10 g × 1,000 = 10,000 mg.
mg = g × 1,000
- Write down the value in grams you want to convert.
- Multiply it by 1,000 (the exact g→mg factor).
- The result is your value in milligrams. Check it below with the converter or the table.
Conversion table
Common values of grams and their equivalents in milligrams:
| g | mg |
|---|---|
| 1 | 1,000 |
| 2 | 2,000 |
| 3 | 3,000 |
| 4 | 4,000 |
| 5 | 5,000 |
| 10 | 10,000 |
| 20 | 20,000 |
| 25 | 25,000 |
| 50 | 50,000 |
| 100 | 100,000 |
| 250 | 250,000 |
| 500 | 500,000 |
About these units
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.
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.
Frequently asked questions
How do I convert grams to milligrams?
To convert grams to milligrams, multiply the number of grams by 1,000. For example, 10 g × 1,000 = 10,000 mg. Or skip the math: type the value into the converter at the top of this page and the result updates instantly.
How many milligrams are in 1 gram?
1 g = 1,000 mg. That is the fixed relationship used by this converter and by international standards.
How many grams are in 1 milligram?
1 mg = 0.001 g. If you are converting in the opposite direction, use our Milligram to Gram converter for the dedicated table and FAQ.
Is the grams to milligrams conversion exact?
Yes. Both units are defined by international agreement, so the factor of 1,000 is exact. Displayed results are rounded to 6 significant digits only for readability.
What is gram used for?
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.