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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.
You have to burn 3500 calories to lose one pound of weight. This is why you should use a calorie counter regularly. How to lose 20 pounds? You have to have a calorie deficit* of 70,000 calories to lose 20 pounds (*burn 70,000 more calories than the number of calories you eat).1  Enter your age and gender.2  Enter your height and weight. calorie is a measure of energy, just as a pound is a measure of weight and a mile is a measure of distance. So the amount of energy you exert in doing an activity is measured by the calories burn rate.