Grams to milligrams converter
Milligrams (mg)
1 gram = 1,000 milligrams
How to convert grams to milligrams
mg = g × 1000
Multiply the number of grams by 1000 to get milligrams. Going the other way, divide by 1000 (or multiply by 0.001).
One gram is exactly defined as 1000 milligrams (to 12 significant figures), and one milligram is 0.001 grams.
Worked examples
- Convert 5 grams: 5 × 1000 = 5,000 5,000 milligrams.
- Convert 12.5 grams: 12.5 × 1000 = 12,500 12,500 milligrams.
- Convert 250 grams: 250 × 1000 = 250,000 250,000 milligrams.
Quick-reference table
| g | mg |
|---|---|
| 1 | 1,000 |
| 2 | 2,000 |
| 3 | 3,000 |
| 5 | 5,000 |
| 10 | 10,000 |
| 15 | 15,000 |
| 20 | 20,000 |
| 25 | 25,000 |
| 50 | 50,000 |
| 75 | 75,000 |
| 100 | 100,000 |
| 1,000 | 1,000,000 |
| mg | g |
|---|---|
| 1 | 0.001 |
| 2 | 0.002 |
| 3 | 0.003 |
| 5 | 0.005 |
| 10 | 0.01 |
| 15 | 0.015 |
| 20 | 0.02 |
| 25 | 0.025 |
| 50 | 0.05 |
| 75 | 0.075 |
| 100 | 0.1 |
| 1,000 | 1 |
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Frequently asked questions
How many milligrams are in 1 gram?
1 gram equals 1,000 milligrams.
What is the formula to convert grams to milligrams?
Use mg = g × 1000. Multiply the number of grams by 1000 to get milligrams. Going the other way, divide by 1000 (or multiply by 0.001).
What is 100 grams in milligrams?
100 grams is 100,000 milligrams.