Grams to milligrams
milligrams = grams × 1,000
Reverse: milligrams to grams
How to convert grams to milligrams
One gram is 1,000 milligrams, so multiply the number of grams by 1,000. For example, 20 grams is 20 × 1,000 = 20,000 milligrams. To go back, divide by the same number, or multiply by 0.001.
Quick estimate
Multiplying by about 1000 gets within 0.0% of the exact answer, which is enough to check that a result makes sense.
Where it comes up
Mass conversions come up in cooking and baking, shipping and luggage limits, body weight, medicine doses and buying food by weight.
| grams | milligrams |
|---|---|
| 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 |
| 11 g | 11,000 mg |
| 12 g | 12,000 mg |
| 13 g | 13,000 mg |
| 14 g | 14,000 mg |
| 15 g | 15,000 mg |
| 16 g | 16,000 mg |
| 17 g | 17,000 mg |
| 18 g | 18,000 mg |
| 19 g | 19,000 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 |
| 60 g | 60,000 mg |
| 70 g | 70,000 mg |
| 75 g | 75,000 mg |
| 80 g | 80,000 mg |
| 90 g | 90,000 mg |
| 100 g | 100,000 mg |
| 120 g | 120,000 mg |
| 150 g | 150,000 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 |
| 1,500 g | 1,500,000 mg |
| 2,000 g | 2,000,000 mg |
| 5,000 g | 5,000,000 mg |
| 10,000 g | 10,000,000 mg |
Questions
How many milligrams are in a gram?
1,000 milligrams.
How do I convert grams to milligrams in a spreadsheet?
Put the value in A1 and type =A1*1000, then fill the formula down the column.
Are the values in the table exact?
They are calculated from the exact definitions of the units and rounded only for display. Open any row for the full working.