When catering for a large number of people, always think about how much each person would consume and what other food is on offer. The easiest way to measure how much rice you need is to allow for ½ cup of uncooked rice per person. And from here you can do the maths accordingly. ½ cup rice pp = 12.5 cups of rice. At 90g per ½ cup, that is 2.25 kg of basmati rice. 1/3 cup rice pp = 8 1/3 cups of rice. At 60g per 1/3 cup, that is 1.5 kg of basmati rice. ¼ cup rice pp = 6 ¼ cup of rice. At 45g per ¼ cup, that is 1.125 kg of basmati rice.