Of course, Susan needs more calories in a day than just her BMR. She needs to take into account her daily activities. As you can imagine, daily activities vary greatly between different people. However, we can use the multipliers below to estimate how many Total Calories Susan needs in a day, activities included. Susan isn't an athlete, but she does meet up with friends to play soccer twice a week , and walks a great deal around campus every day. She decides her activity level (See below) is Moderately Active. Sedentary (little or no exercise) = BMR x 1.2 Lightly active (light exercise/sports 1-3 days/week): = BMR x 1.375 Moderately active (moderate exercise/sports 3-5 days/week) = BMR x 1.55 Very active (hard exercise/sports 6-7 days a week) = BMR x 1.725 Extra active (very hard exercise/sports & physical job or 2x training)= BMR x 1.9