Grams to Milligrams Converter
Convert grams (g) to milligrams (mg) instantly. Type a value above and the result updates while you type. 1 gram equals 1000 milligrams.
Result updates as you type. Values are calculated locally in your browser — nothing is sent to a server.
The formula
1 gram = 1000 milligrams
Multiply the grams value by 1000 to get milligrams. Or divide by 0.001 to go the other way.
Grams to milligrams conversion table
| g | mg |
|---|---|
| 1 | 1000 |
| 2 | 2000 |
| 3 | 3000 |
| 4 | 4000 |
| 5 | 5000 |
| 6 | 6000 |
| 7 | 7000 |
| 8 | 8000 |
| 9 | 9000 |
| 10 | 10,000 |
| 15 | 15,000 |
| 20 | 20,000 |
| 25 | 25,000 |
| 50 | 50,000 |
| 75 | 75,000 |
| 100 | 100,000 |
Worked examples
- 5 g × 1000 = 5000 mg
- 30 g × 1000 = 30,000 mg
- 165 g × 1000 = 165,000 mg
Conversion factors follow the exact international definitions (SI/BIPM; imperial units per the 1959 International Yard and Pound Agreement, maintained by NIST). NIST unit conversion reference
Factors last verified August 2026 · Built by Jeffrey Tepper.
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Frequently asked questions
How many milligrams are in 1 gram?
1 gram equals 1000 milligrams (g → mg).
How do you convert grams to milligrams?
Multiply the number of grams by 1000. For example: 10 g × 1000 = 10,000 mg.
What is 50 g in mg?
50 g equals 50,000 mg.
Which is bigger: 1 gram or 1 milligram?
1 gram is bigger: it equals 1000 milligrams.