Long-grain rice grains weigh around 1/64 of a gramme each. This weight differs slightly based on the type of rice being measured.
One pound of white long-grain rice has around 29,000 grains. One pound is equal to sixteen ounces, so there are 1,812 grains of rice in each ounce. One ounce is equal to 28.35 grammes, so there are approximately 64 grains of rice in one gramme of rice. This indicates that each rice grain weighs roughly 1/64 of a gramme.
Rice intake varies greatly from culture to culture. The average American consumes approximately 26 pounds of rice annually, but Asians consume up to 300 pounds. The average Asian consumes about 9 million grains of rice annually.