this is how spark calculates your ranges. keep in mind that your size determines how much you can lose. in other words, if you are 200+lbs, you can lose 2lbs per week. if you are 110lbs trying to lose ten pounds, you're not going to be able to pull 2lbs per week. you're not even going to be able to pull 1 lb per week at that weight. at 110lbs you're looking more like 1/4-1/2lb per week. figure you can lose about 1% of your bodyweight per week up until you're about 30-40lbs from your goal, at which point it's going to be about half that.