Grains to Milligrams
Convert grains (gr) to milligrams (mg). Type in either box; the other updates as you go.
How to convert grains to milligrams
To convert grains to milligrams, multiply the number of grains by 64.79891.
Example
Convert 5 grains to milligrams:
Grain to milligram conversion chart
| Grains (gr) | Milligrams (mg) |
|---|---|
| 1 gr | 64.79891 mg |
| 2 gr | 129.5978 mg |
| 3 gr | 194.3967 mg |
| 4 gr | 259.1956 mg |
| 5 gr | 323.9945 mg |
| 6 gr | 388.7935 mg |
| 7 gr | 453.5924 mg |
| 8 gr | 518.3913 mg |
| 9 gr | 583.1902 mg |
| 10 gr | 647.9891 mg |
| 12 gr | 777.5869 mg |
| 15 gr | 971.9837 mg |
| 20 gr | 1,295.978 mg |
| 25 gr | 1,619.973 mg |
| 30 gr | 1,943.967 mg |
| 40 gr | 2,591.956 mg |
| 50 gr | 3,239.946 mg |
| 60 gr | 3,887.935 mg |
| 70 gr | 4,535.924 mg |
| 75 gr | 4,859.918 mg |
| 80 gr | 5,183.913 mg |
| 90 gr | 5,831.902 mg |
| 100 gr | 6,479.891 mg |
| 150 gr | 9,719.837 mg |
| 200 gr | 12,959.78 mg |
| 250 gr | 16,199.73 mg |
| 500 gr | 32,399.46 mg |
| 1,000 gr | 64,798.91 mg |
Going the other way? See the milligrams to grains chart.
About the units
Grain (gr)
A grain is exactly 64.79891 milligrams. There are 7,000 grains in a pound; it is used for bullets, arrows and some medicines.
Milligram (mg)
A milligram is one thousandth of a gram. Medicine doses and nutrition labels use milligrams.
Frequently asked questions
How many milligrams are in a grain?
There are 64.79891 milligrams in a grain.
How many grains are in a milligram?
There are 0.01543235835 grains in a milligram.
How do you convert grains to milligrams?
To convert grains to milligrams, multiply the number of grains by 64.79891.
What is 5 grains in milligrams?
5 grains equals 323.995 milligrams.
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