How the calculation works
mg = g × 1,000
A worked example
5 grams equals 5,000 mg. A powder serving with 3 g of creatine contains 3,000 mg of creatine when both figures describe the same ingredient.
Reading supplement labels
Powders commonly list grams, while capsules commonly list milligrams. Compare the active ingredient in both products. A 5 g scoop of a blend does not necessarily contain 5 g of the ingredient you are buying.
g to mg conversion table
These are equivalent amounts, not suggested doses.
| g | mg |
|---|---|
| 0.1 | 100 |
| 0.25 | 250 |
| 0.5 | 500 |
| 1 | 1,000 |
| 2 | 2,000 |
| 3 | 3,000 |
| 5 | 5,000 |
| 10 | 10,000 |
| 25 | 25,000 |
Common questions
How do I convert g to mg?
Take the amount in g and multiply it by 1,000. The result is the same mass expressed in mg.
Are mcg and µg the same unit?
Yes. Both mean micrograms. One milligram equals 1,000 micrograms, and one gram equals 1,000 milligrams.
Can I use this to convert IU?
No. International Units measure biological activity and depend on the nutrient. Use the vitamin D converter for vitamin D; its factor does not apply to vitamin A or E.
Reference: NIST: metric prefixes. Reviewed .