Convert Gram to Milligram
Convert Gram to Milligram instantly. 1 g = 1,000 mg. Formula, worked examples and a quick reference table.
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One gram equals 1,000 milligrams. To convert any number of grams to milligrams, multiply by 1,000.
The converter above works in both directions and updates as you type. Below you will find the formula, a worked example and a reference table of common values.
Gram to Milligram formula
milligram = gram × 1,000
To go the other way, use gram = milligram ÷ 1,000.
Gram to Milligram conversion table
| Gram | Milligram |
|---|---|
| 1 g | 1,000 mg |
| 2 g | 2,000 mg |
| 3 g | 3,000 mg |
| 5 g | 5,000 mg |
| 10 g | 10,000 mg |
| 20 g | 20,000 mg |
| 25 g | 25,000 mg |
| 50 g | 50,000 mg |
| 100 g | 100,000 mg |
| 250 g | 250,000 mg |
| 500 g | 500,000 mg |
| 1,000 g | 1,000,000 mg |
Frequently asked questions
How many milligrams are in a gram? +
There are 1,000 milligrams in one gram.
What is 10 g in mg? +
10 g equals 10,000 mg. Multiply 10 by 1,000.
How do I convert milligram back to gram? +
Use gram = milligram ÷ 1,000. The converter above handles both directions, or see our dedicated Milligram to Gram page.