40mg is about 0.62gr
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How many grains equal 0.4mg ?
A grain is equal to 65mg. So, 10 grains is equal to 650mg.
8.1 mg, approx.
1 grain is equal to 0.323 Carat (int) 1 carat (int) is equal to 3.086 Grain
1 gr(grain) is equal to about 1/64th of a mg so 1 mg(milligram) is equal to 0.0154323584 gr(grains)