Grams to Milligrams
Convert grams (g) to milligrams (mg) instantly — with formula and reference table.
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Quick answer: 1 g = 1000 mg. To convert grams to milligrams, multiply by g × 1000.
Converting grams to milligrams
This converter changes a value in grams (g) into milligrams (mg). One gram equals 1000 mg. One gram equals 1,000 milligrams, so grams-to-milligrams is multiplication by 1,000. The conversion runs entirely in your browser — enter a value and the result updates instantly, in either direction.
Formula
mg = g × 1000
Example
Convert 10 g to mg: 10 × 1000 = 10000 mg.
Grams to Milligrams conversion table
| Grams (g) | Milligrams (mg) |
|---|---|
| 1 g | 1000 mg |
| 2 g | 2000 mg |
| 3 g | 3000 mg |
| 5 g | 5000 mg |
| 10 g | 10000 mg |
| 20 g | 20000 mg |
| 25 g | 25000 mg |
| 50 g | 50000 mg |
| 100 g | 100000 mg |
How to use this converter
- Enter a value in the grams (g) field.
- Read the converted value in milligrams (mg) below.
- Type into the mg field instead to convert in reverse, or use the swap button.
Frequently asked questions
How many milligrams are in a gram?
1 gram equals 1,000 milligrams.
How do I convert 2.5 g to mg?
2.5 times 1,000 = 2,500 mg.
How many milligrams in a microgram?
1 milligram equals 1,000 micrograms (mcg).