Grams to Milligrams: the quick answer
1 g = 1,000 mg
1 gram equals 1,000 milligrams
To convert grams to milligrams, multiply the value by 1,000. To go the other way, multiply milligrams by 0.001 to get grams.
Enter details
1 gram =
1,000 milligrams
1 milligram =
0.001 grams
Formula
mg = g × 1,000
Handy values
5 g = 5,000 mg · 10 g = 10,000 mg · 100 g = 100,000 mg
Conversion at a glance
Formula
Grams to Milligrams
mg = g × 1,000
Milligrams to Grams
g = mg × 0.001
Where
- g = the weight in grams
- mg = the weight in milligrams
Every unit here is defined by its weight in kilograms, so the conversion factor is (kilograms per gram) ÷ (kilograms per milligram).
Grams to Milligrams conversion table
| 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 |
| 7 g | 7,000 mg |
| 8 g | 8,000 mg |
| 9 g | 9,000 mg |
| 10 g | 10,000 mg |
| 12 g | 12,000 mg |
| 14 g | 14,000 mg |
| 15 g | 15,000 mg |
| 20 g | 20,000 mg |
| 21 g | 21,000 mg |
| 24 g | 24,000 mg |
| 25 g | 25,000 mg |
| 30 g | 30,000 mg |
| 40 g | 40,000 mg |
| 50 g | 50,000 mg |
| 60 g | 60,000 mg |
| 75 g | 75,000 mg |
| 80 g | 80,000 mg |
| 100 g | 100,000 mg |
| 200 g | 200,000 mg |
| 250 g | 250,000 mg |
| 300 g | 300,000 mg |
| 400 g | 400,000 mg |
| 500 g | 500,000 mg |
| 750 g | 750,000 mg |
| 1,000 g | 1,000,000 mg |
Worked examples
About these units
Gram (g). The gram is one thousandth of a kilogram, the everyday unit for food, gold and small items.
Milligram (mg). A milligram is one thousandth of a gram, used for medicine doses and nutrition labels.
Frequently asked questions
How many milligrams are in one gram?
There are 1,000 milligrams in one gram.
How do I convert grams to milligrams?
Multiply the number of grams by 1,000. For example, 10 grams equal 10,000 milligrams.
How many grams are in one milligram?
One milligram equals 0.001 grams.
How many milligrams is 12 grams?
12,000 milligrams. Other common values: 5 grams = 5,000 milligrams and 100 grams = 100,000 milligrams.
More weight conversions
From grams
g to kg
g to lb
g to oz
g to st
g to t
g to ton (US)
g to ton (UK)
g to q
g to ct
g to oz t
g to tola
g to µg
To milligrams
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