TDEE Explained: How to Calculate Your Total Daily Energy Expenditure

Total Daily Energy Expenditure (TDEE) represents the total number of calories your body burns in a 24-hour period. It accounts for everything from basic biological functions to exercise and even the energy used to digest food. If you're trying to lose weight, gain muscle, or simply maintain your current physique, TDEE is the single most important number to know.

The Components of TDEE

Your TDEE is made up of four components:

1. Basal Metabolic Rate (BMR): The calories your body needs at complete rest — breathing, circulation, cell repair. This typically accounts for 60–70% of TDEE.
2. Thermic Effect of Food (TEF): The energy required to digest, absorb, and process nutrients — roughly 10% of calorie intake.
3. Non-Exercise Activity Thermogenesis (NEAT): Calories burned through everyday movement like walking, fidgeting, and household chores.
4. Exercise Activity Thermogenesis (EAT): Calories burned during intentional exercise.

How TDEE Is Calculated

The most common method multiplies your BMR by an activity factor:

TDEE = BMR × Activity Multiplier

Activity multipliers range from 1.2 (sedentary) to 1.9 (extremely active). Your BMR is typically estimated using the Mifflin-St Jeor equation, which factors in age, sex, weight, and height.

Using TDEE for Your Goals

• Weight loss: Eat 300–500 calories below your TDEE for a sustainable deficit.
• Muscle gain: Eat 200–400 calories above your TDEE to support growth.
• Maintenance: Match your calorie intake to your TDEE.

Common TDEE Mistakes

The biggest error is overestimating activity level. Most people with desk jobs who exercise 3–4 times per week fall into the "lightly active" or "moderately active" category — not "very active." Starting with a conservative estimate and adjusting based on real-world results over 2–3 weeks is the most reliable approach.

Calculate Your TDEE

Use our free TDEE Calculator to get your personalized estimate. Then head to the Calorie Calculator to translate that number into a daily calorie target for your specific goal.