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Report Abuse. You have to eat 3500 calories less than the body requires to loose a pound. If you take your weight (say 200 lbs.) times 15 = 3000 cal. Therefore you would take the 3000 calories times 7 days which would = 21,000 calories. For every 3500 calories you eat less in one week represents 1 lb.
One pound is equal to 3,500 calories. So, if you want to lose 1 pound per week, you would need to cut 500 calories from the calories that you usually eat in a day.1  Last Reviewed: May 15, 2015. 2  Last Edited: May 15, 2015.ext, find the line on the calorie chart that applies to you based on your gender, age, and level of activity. Remember that the chart estimates how many calories you should eat per day to keep your body weight where it is now. If you want to lose weight, you may need fewer calories.