avoirdupois grain = 0.00006479891 kilogram
Try converting from "gr" to AMU (atomic mass unit), assay ton, catty (Chinese catty), cotton bale (US), dinar (Arabian dinar), funt (Russian funt), Israeli shekel mass, kin (Japanese kin), metric ton, Mexican libra, obol (Greek obol), pennyweight troy (troy pennyweight), picul (Chinese picul), pound ap (apothecary pound), Roman obolus, scrupulum (Roman scrupulum), short ton, Spanish libra, tael (Chinese tael), talent (Greek talent), or any combination of units which equate to "mass" and represent mass.
gr = 3.90E+22 AMU (atomic mass unit), .00000542 arroba (Mexican arroba), .00774181 Babylonian shekel, .00000893 bowling ball, .00000143 cental (British cental), 1.90E-07 cotton bale Egypt, .01666667 dram ap (apothecary dram), 7.11E+25 electron mass (electron rest mass), 1 grain (avoirdupois grain), .00660765 hyl, .0000051 long quarter, 6.48E-08 metric ton, .00014075 Mexican libra, 20 mite (English mite), .08928571 obol (Greek obol), .0001296 pfund (German pfund), .00017361 pound ap (apothecary pound), .05 scruple (apothecary scruple), .05704507 scrupulum (Roman scrupulum), .00014088 Spanish libra.
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