Total daily energy expenditure

Total daily energy expenditure (TDEE) is the number of calories someone’s body uses within 24 hours. This value includes the amount of calories your body uses both at rest and during activity. Your TDEE is calculated based on your age, sex, height, weight, lean body mass, and activity level. Thus, caloric requirements can vary significantly amongst individuals.

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TDEE is an important tool to weight loss, as it will indicate the number of calories someone would need to consume to lose weight, maintain their weight, or gain weight. For example, if you are looking to lose weight, you can input your specific information (e.g., age, weight, height, etc.) into a TDEE calculator. This calculator would then estimate how many calories you would need to eat daily to lose a certain amount of weight per week (e.g., what your “calorie deficit” should be). TDEE can be particularly useful for guiding nutrition and fitness plans.

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Your TDEE is highly individualized, but a rough estimation of your TDEE can be calculated using the following:
Fat loss: 12-13 calories per pound of body weight
Maintenance: 15-16 calories per pound of body weight
Weight gain: 18-19 calories per pounds of body weight
Keep in mind that this is an estimate, and you can better predict your TDEE using a TDEE calculator.