There are roughly 64.8 milligrams in a grain.
1/150 grains = 0.432 mg
0.4 mg = 0.0061729 grains.
45 mg = 0.69446 grains
14 mg is 0.21605 grains.
1 gram =15.4324 grains. Therefore, 5 grains is 325 mg
10 grains is 648 (647.99) mg
1 gr(grain) is equal to about 1/64th of a mg so 1 mg(milligram) is equal to 0.0154323584 gr(grains)
1/4 grain =15 mg1 grain = 60 mg
1.5 grains = 97.2mg
0.4mg is 0.0061729 grains.
1.88 mg is equivalent to approximately 29 grains.