Convert grams to milligrams instantly. Enter a value below, or use the formula and reference table further down the page.
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How to convert grams to milligrams
Multiply the value by 1000.
mg = g × 1000Example: 10 g = 10000 mg.
Grams to Milligrams conversion table
| Grams (g) | Milligrams (mg) |
|---|---|
| 1 g | 1000 mg |
| 2 g | 2000 mg |
| 3 g | 3000 mg |
| 4 g | 4000 mg |
| 5 g | 5000 mg |
| 10 g | 10000 mg |
| 15 g | 15000 mg |
| 20 g | 20000 mg |
| 25 g | 25000 mg |
| 50 g | 50000 mg |
| 100 g | 100000 mg |
Frequently asked questions
How many milligrams is 1 gram?
1 gram equals 1000 milligrams.
What is the formula to convert g to mg?
To convert g to mg, multiply the value by 1000. The full formula is: mg = g × 1000.
How do I convert milligrams back to grams?
Use the same calculator above and type your value into the milligrams field instead — it converts in both directions. Or use the reverse formula: g = mg ÷ 1000.
Is the g to mg conversion exact?
The conversion factor used here (1000) is the standard internationally defined value. Results on this page are rounded to four decimal places for readability.