First of all, compositions of population in rural and urban areas is ascertained. Entire population is categorised into sixteen categories on the basis of age, sex and activity and calories for each group is ascertained. Now calorie requirement of a cer¬tain group is multiplied by its proportion in the population. Adding all such products, we get the average" calorie requirements for rural and urban person which was fixed at 2400 and 2100 calories respectively which are approximated to 2400 and 2100 calories.