.025 miligram
I assume you mean 5 and 025 (but I'll answer for.025 also). 5 milligrams is larger than 0.025mg. However 5mg is smaller than 025 milligrams.
(1/8) grain = 8.09986375 milligrams FYI: Google "convert 1/8 grain to milligrams"
10
A grain is equal to 65mg. So, 10 grains is equal to 650mg.
16.1997275 milligrams
30 milligrams is less than half of one grain. to be exact, 0.462970 grains.
The weight of a grain is approximately 65 milligrams. Therefore, 0.3 mg would be equivalent to around 0.0046 grains.
64.79891 mg to a grain In medicine one grain can be 60 or 65 mg.
I would have to say half a miligram - one miligram at the most.
There are approximately 64.8 milligrams in 1 grain.
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.