Daily Calorie Needs Calculator . Please Enter Your:     Height: ' " Weight: Age: Gender: Male Female Activity Level: Very light Light Moderate Heavy Exceptionally Heavy Sports All-Out Training Extended Maximum Effort *     Your Daily Calorie Need is (click GO)...     kcal Knowing your Daily Calorie Needs is more than knowing how many calories your body needs for its basic physiologic functions (known as your Resting Metabolic Rate). It's also important to know how many calories your body needs to maintain certain daily activities. By combining your resting metabolic rate and your daily activity level, you will get the total number of calories your body needs during the day. .