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How many calories do you need? This depends on your weight and on what you do. When you are asleep, your body uses nearly one calorie an hour for every kilogram of weight. So a person who weighs seventy kilos uses about 560 calories while sleeping for eight hours; in other words, he needs about 1680 calories just to stay alive for 24 hours, even without doing anything. More calories are needed for different activities – from 100 calories an hour for reading or watching TV, to 350 calories an hour for playing football. To calculate the number of calories needed per day for an average person, first find out that person’s ideal weight.