Note: Please, we do not recommend anyone go under 1200 calories per day for weight loss, unless they are under the supervision of their physician. We realize that because of the mathematics involved with creating this calorie estimator it may tell you to go lower than you should. We hope to get that worked out soon. Additionally, as you lose weight, your caloric needs will also change, therefore you will need to refigure your caloric needs for about every 25 pounds lost.