Grams to Milligrams Converter
Convert grams to milligrams instantly. One gram equals exactly 1,000 milligrams. Type in either box to convert both ways, then use the chart, worked examples and everyday sizes below.
How to convert grams to milligrams
Worked example: convert 7 grams to milligrams. Using milligrams ← grams × 1,000, we get 7 × 1,000 = 7,000 mg. To check the result, convert back: 7,000 mg ÷ 1,000 = 7 g.
Grams to milligrams chart
| Grams (g) | Milligrams (mg) |
|---|---|
| 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 |
| 8 g | 8,000 mg |
| 10 g | 10,000 mg |
| 12 g | 12,000 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 |
| 150 g | 150,000 mg |
| 200 g | 200,000 mg |
| 250 g | 250,000 mg |
| 500 g | 500,000 mg |
| 1,000 g | 1,000,000 mg |
Milligrams to grams (reverse)
| Milligrams (mg) | Grams (g) |
|---|---|
| 1 mg | 0.001 g |
| 2 mg | 0.002 g |
| 5 mg | 0.005 g |
| 10 mg | 0.01 g |
| 20 mg | 0.02 g |
| 50 mg | 0.05 g |
| 100 mg | 0.1 g |
| 250 mg | 0.25 g |
| 500 mg | 0.5 g |
| 1,000 mg | 1 g |
About the gram and the milligram
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.
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.
One gram equals 1,000 milligrams, which makes the gram the heavier unit of the two.
Everyday sizes in grams and milligrams
| Everyday example (approximate) | In grams | In milligrams |
|---|---|---|
| A paperclip | 1 g | 1,000 mg |
| A US stick of butter | 113 g | 113,000 mg |
| A smartphone | 190 g | 190,000 mg |
| A liter of water | 1,000 g | 1,000,000 mg |
| A newborn baby | 3,400 g | 3,400,000 mg |
| A bowling ball (maximum) | 7,260 g | 7,260,000 mg |
Grams to milligrams FAQ
How many milligrams are in one gram?
One gram equals exactly 1,000 milligrams. In the other direction, one milligram equals 0.001 grams.
How do I convert grams to milligrams without a calculator?
convert 7 grams to milligrams. Using milligrams ← grams × 1,000, we get 7 × 1,000 = 7,000 mg. To check the result, convert back: 7,000 mg ÷ 1,000 = 7 g. For a quick estimate, round the factor to 1,000. Then 7 g is about 7,000 mg, compared with the exact 7,000 mg (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 milligrams?
A bowling ball (maximum) is about 7,260 grams, which is 7,260,000 milligrams. Treat that as an approximate everyday figure rather than an official measurement.
Are the grams and milligrams the same in every country?
The gram is exactly 0.001 kg. The milligram is exactly 0.001 g.