This calorie calculator uses the Harris Benedict Equation to calculate your daily caloric needs. I don’t personally like to count calories but it is important to have a rough idea of whats going on in your body and how much energy it needs to function. The Harris Benedict Equation is a formula that uses your BMR (Basal Metabolic Rate) and then applies an activity factor to determine your total daily energy expenditure as calories. The only factor omitted by the Harris Benedict Equation is lean body mass but most of us don’t know our actual numbers for this so it assumes your an average person. Knowing this, leaner bodies need more calories than fatter ones. Therefore, this equation will be very accurate in all but the very muscular (it will under-estimate caloric needs) and the very fat (it will over-estimate caloric needs). Plug in your numbers and see what you get. Remember that starving yourself will considerably slow your BMR and thus stall the weight loss. Of course you could just eat healthy protein and fats and not really worry to much about all these formulas and numbers.