The number of calories burned in a day varies based on factors such as sex, age, weight, height, and activity level. Most adult women burn between 1,600 and 2,200 calories per day, while most adult men burn between 2,200 and 3,000 calories per day depending on their physical activity and other factors. The basal metabolic rate (BMR), which is the energy used to maintain basic bodily functions at rest, makes up a significant portion of daily calorie burn. Additionally, calories are burned through daily activities, exercise, and the thermic effect of food (energy used to digest and process food).