There are about 49 grains of rice in a gram.
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According to freerice.com, if rice is a staple part of your diet, then you need 18,400 grains of rice.
14,500 grains freerice.com
Extrapolating from the answer to how may grains in a pound of rice, 29,000, (elsewhere in Answers.com) we get something like 64,000 grains in a kilogram (@ 2.2 lbs / kg). This could vary based on the kind of rice.
18,446,744,070,000,000,000 grains of rice 1 million grains
The mass of one grain of rice is 25 milligram or .025 grams. There are about 29,000 rice grains in approximately one pound of long-grain white rice.