There are 5 activity levels you can make: Sedentary, Light Exercise (1-2 days per week), Moderate (3-5 days per week), Heavy (6-7 days per week), and Athlete (2x per day). All of these are based on your activity level, and that's what you should base your calculations on. If you work out 3-4 days a week, choose Moderate. If you work out 6 days a week, choose Heavy. If you need to be honest with yourself on what activity level you belong to. Regardless, the calculator will allow you more accurate to help you remain on an accurate calorie target. Some of my users will even go as far as using it if you want to build muscles. But if you want to check your calorie savings, you must start opening up your diet for the benefit of the game. After a few weeks, and based on your weight, fine-tune your calories up or down.