MG to Grams Converter
Convert milligrams (mg) to grams (g) instantly. Type a value — the result updates as you type, and the swap button converts the other way.
mg to Grams formula
g = mg ÷ 1000
1 milligram = 0.001 grams · 1 gram = 1000 milligrams
To convert milligrams to grams, divide the value by 1000. For example, 500 mg:
g = 500 ÷ 1000g = 0.5
So 500 mg = 0.5 g.
Mental math shortcut
This conversion is exact, so there is no need to estimate: just divide by 1,000.
mg to Grams conversion table
Grams back to mg
The same values converted the other way, rounded for everyday use:
| Grams | Milligrams |
|---|---|
| 0.001 g | 1 mg |
| 0.01 g | 10 mg |
| 0.05 g | 50 mg |
| 0.1 g | 100 mg |
| 0.25 g | 250 mg |
| 0.5 g | 500 mg |
| 1 g | 1000 mg |
| 2 g | 2000 mg |
About the units
Milligrams (mg)
A milligram is one thousandth of a gram. Medicine doses, vitamins and nutrition labels commonly use milligrams.
Grams (g)
A gram is one thousandth of a kilogram. It is the standard metric unit for food, ingredients and small weights.
Frequently asked questions
How many grams are in a milligram?
One milligram equals 0.001 grams.
What is 500 mg in Grams?
500 mg = 0.5 g.
How do I convert Grams back to mg?
Multiply the grams by 1000.