Assuming you mean the obsolete mass unit rather than a grass seed. one grain is 64.799 milligrams.
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A grain of rice is several milligram. A large paper clip might weigh as much as a gram.
It weighs 1000 grains. This is equivalent to 64.79891 grams, or 2.08333 troy ounces, or 2.28571429 ounces avoirdupois.
Sorry, Wrong Units. Grains are weigh and mL (milliliters) are volume.
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how much do you Weigh? How much does the parcel Weigh?