How to convert milligrams to grams
g = mg × 0.001Multiply the value in milligrams by 0.001. To go the other way, multiply by 1,000 (or divide by 0.001).
A milligram is smaller than a gram: it takes 1,000 milligrams to make one gram.
Worked examples
- 1 milligram1 mg × 0.001 = 0.001 g
- 5 milligrams5 mg × 0.001 = 0.005 g
- 10 milligrams10 mg × 0.001 = 0.01 g
- 20 milligrams20 mg × 0.001 = 0.02 g
- 100 milligrams100 mg × 0.001 = 0.1 g
Milligrams to grams conversion table
Values are calculated by the conversion engine and rounded to 8 significant figures.
| Milligrams (mg) | Grams (g) |
|---|---|
| 0.1 mg | 0.0001 g |
| 0.25 mg | 0.00025 g |
| 0.5 mg | 0.0005 g |
| 1 mg | 0.001 g |
| 2 mg | 0.002 g |
| 3 mg | 0.003 g |
| 4 mg | 0.004 g |
| 5 mg | 0.005 g |
| 6 mg | 0.006 g |
| 7 mg | 0.007 g |
| 8 mg | 0.008 g |
| 9 mg | 0.009 g |
| 10 mg | 0.01 g |
| Milligrams (mg) | Grams (g) |
|---|---|
| 12 mg | 0.012 g |
| 15 mg | 0.015 g |
| 20 mg | 0.02 g |
| 25 mg | 0.025 g |
| 30 mg | 0.03 g |
| 40 mg | 0.04 g |
| 50 mg | 0.05 g |
| 75 mg | 0.075 g |
| 100 mg | 0.1 g |
| 250 mg | 0.25 g |
| 500 mg | 0.5 g |
| 1,000 mg | 1 g |
About the units
Milligram (mg)
One thousandth of a gram. Medication doses and vitamin contents are usually given in milligrams. One milligram equals 0.000001 kilograms (kg).
Gram (g)
One thousandth of a kilogram. Recipes, nutrition labels and postal scales use grams; a US nickel weighs 5 g. One gram equals 0.001 kilograms (kg).
Frequently asked questions
How many grams are in one milligram?
There are 0.001 grams in one milligram, and this value is exact by definition.
How do I convert milligrams to grams?
Multiply the number of milligrams by 0.001. For example, 10 mg × 0.001 = 0.01 g.
How many milligrams are in one gram?
One gram equals 1,000 milligrams. That is the reverse factor, 1 ÷ 0.001.
What is 10 milligrams in grams?
10 mg = 0.01 g.
Is this mg to g converter accurate?
Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.