Milligrams to Grams Converter
Convert milligrams to grams instantly. One milligram equals exactly 0.001 grams. Type in either box to convert both ways, then use the chart, worked examples and everyday sizes below.
How to convert milligrams to grams
Worked example: convert 12 milligrams to grams. Using grams ← milligrams ÷ 1,000, we get 12 × 0.001 = 0.012 g. To check the result, convert back: 0.012 g ÷ 0.001 = 12 mg.
Milligrams to grams chart
| Milligrams (mg) | Grams (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 |
| 8 mg | 0.008 g |
| 10 mg | 0.01 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 |
| 150 mg | 0.15 g |
| 200 mg | 0.2 g |
| 250 mg | 0.25 g |
| 500 mg | 0.5 g |
| 1,000 mg | 1 g |
Grams to milligrams (reverse)
| Grams (g) | Milligrams (mg) |
|---|---|
| 1 g | 1,000 mg |
| 2 g | 2,000 mg |
| 5 g | 5,000 mg |
| 10 g | 10,000 mg |
| 20 g | 20,000 mg |
| 50 g | 50,000 mg |
| 100 g | 100,000 mg |
| 250 g | 250,000 mg |
| 500 g | 500,000 mg |
| 1,000 g | 1,000,000 mg |
About the milligram and the gram
A milligram is one thousandth of a gram. It is the standard unit for medicine doses, vitamins and the sodium or caffeine figures on nutrition labels; a grain of table salt weighs roughly 0.06 mg.
The gram is one thousandth of a kilogram and the everyday unit for cooking ingredients, nutrition labels and postal weights of small items. A paperclip weighs about one gram.
One gram equals 1,000 milligrams, which makes the gram the heavier unit of the two.
Everyday sizes in milligrams and grams
| Everyday example (approximate) | In milligrams | In grams |
|---|---|---|
| A paperclip | 1,000 mg | 1 g |
| A US stick of butter | 113,000 mg | 113 g |
| A smartphone | 190,000 mg | 190 g |
| A liter of water | 1,000,000 mg | 1,000 g |
| A newborn baby | 3,400,000 mg | 3,400 g |
| A bowling ball (maximum) | 7,260,000 mg | 7,260 g |
Milligrams to grams FAQ
How many grams are in one milligram?
One milligram equals exactly 0.001 grams. In the other direction, one gram equals 1,000 milligrams.
How do I convert milligrams to grams without a calculator?
convert 12 milligrams to grams. Using grams ← milligrams ÷ 1,000, we get 12 × 0.001 = 0.012 g. To check the result, convert back: 0.012 g ÷ 0.001 = 12 mg. For a quick estimate, round the factor to 0.001. Then 12 mg is about 0.012 g, compared with the exact 0.012 g (an error of 0%). That is close enough for planning, but use the calculator above when the number matters.
What is a bowling ball (maximum) in grams?
A bowling ball (maximum) is about 7,260,000 milligrams, which is 7,260 grams. Treat that as an approximate everyday figure rather than an official measurement.
Are the milligrams and grams the same in every country?
The milligram is exactly 0.001 g. The gram is exactly 0.001 kg.