First of all, it is a great tool for those who want to better control their diet and exercise. It makes it easy to calculate how many calories you need to consume per day to maintain your weight, lose weight or gain muscle mass. What I liked most is how easy it is to use. You just enter your parameters (age, weight, height, level of physical activity), and the calculator gives you accurate data on the daily calorie intake. This data turned out to be quite accurate - when I started monitoring the amount of calories consumed and adjusted my diet, I noticed changes after just a couple of weeks.