Grams to Milligrams Converter
Convert grams (g) to milligrams (mg), with the formula, a conversion table and exact factors.
Change the values and press Calculate to work out your own figures.
Enter a weight, choose its unit and the unit you want. The answer is exact until it is shown, and the same value appears in every other unit.
Show the working
- 1 g = 1000 mg
- 1 × 1000 = 1000 mg
How to convert grams to milligrams
1 g = 1,000 mg, so multiply by 1,000 to go from grams to milligrams. Going the other way, 1 mg = 0.001 g.
mg = g × 1,000 g = mg × 0.001
Worked example:
1 g = 1000 mg 5 × 1000 = 5000 mg
Grams to milligrams table
| Grams | Milligrams |
|---|---|
| 1 g | 1,000 mg |
| 2 g | 2,000 mg |
| 3 g | 3,000 mg |
| 4 g | 4,000 mg |
| 5 g | 5,000 mg |
| 6 g | 6,000 mg |
| 7 g | 7,000 mg |
| 8 g | 8,000 mg |
| 9 g | 9,000 mg |
| 10 g | 10,000 mg |
| 15 g | 15,000 mg |
| 20 g | 20,000 mg |
| 25 g | 25,000 mg |
| 30 g | 30,000 mg |
| 40 g | 40,000 mg |
| 50 g | 50,000 mg |
| 75 g | 75,000 mg |
| 100 g | 100,000 mg |
| 250 g | 250,000 mg |
| 500 g | 500,000 mg |
| 1000 g | 1,000,000 mg |
About the units
- Grams (g)
- Grams, a metric unit. Definition: BIPM SI Brochure.
- Milligrams (mg)
- Milligrams, a metric unit. Definition: BIPM SI Brochure.