The Perfect Diet Tracker application was created based on scientific research, primarily using the Harris Benedict Equation to calculate your 'basal metabolic rate' or BMR. When you first set up a user in the software it will ask you for certain information, including your age, height, weight sex, and current activity levels. The software then calculates your basal metabolic rate and the number of calories you need in order to maintain your current body weight. Using your target weekly weight loss, the Perfect Diet Tracker will then suggest a daily calorie intake figure per day in order to lose, maintain or gain weight. This type of diet is commonly known as a 'calorie counting' diet, most diet products you pick up state they will only work as part of a calorie controlled diet.