10 mg
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16.1997275 milligrams
30 milligrams is less than half of one grain. to be exact, 0.462970 grains.
Assuming you mean the obsolete mass unit rather than a grass seed. one grain is 64.799 milligrams.
I would have to say half a miligram - one miligram at the most.
1,000 milligrams = 1 gram about 450 grams = 1 pound So about 450,000 milligrams in 1 pound. Of the choices you listed, the best match for a grain of salt has to be 1 milligram.