1000
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1 gr(grain) is equal to about 1/64th of a mg so 1 mg(milligram) is equal to 0.0154323584 gr(grains)
60 mg -------- gr i 45 mg 15 mg -------- -------- gr 3/4 gr 1/4 30 mg -------- gr 1/2
1 milligram = 0.001 grams
.25 gr = .25 x 1000 = 250 mg
60 mg is 0.925942 gr(grain), or 0.06 g(grams).