What is TDEE?
Total Daily Energy Expenditure (TDEE) is the total number of calories your body burns in a 24-hour period. It encompasses everything from keeping your heart beating while you sleep to the energy you expend running a marathon.
Understanding your TDEE is arguably the most important metric in personal nutrition. Whether you want to lose, gain, or maintain weight, your TDEE serves as your baseline target.
The Four Components of TDEE
Your TDEE is not a single, static number. It is the sum of four distinct metabolic processes:
1. Basal Metabolic Rate (BMR) (~70%)
This is the energy your body requires to perform basic life-sustaining functions at complete rest, such as breathing, blood circulation, and cellular growth. For most people, BMR accounts for the vast majority—roughly 70%—of their TDEE. You can read more about it in our BMR Guide.
2. Non-Exercise Activity Thermogenesis (NEAT) (~15%)
NEAT includes the calories burned through daily movements that are not structured exercise. This includes walking to your car, typing on a keyboard, fidgeting, and doing household chores. NEAT is highly variable from person to person; a construction worker will have a vastly higher NEAT than an office worker.
3. Thermic Effect of Food (TEF) (~10%)
Your body actually burns calories digesting, absorbing, and storing the food you eat. Protein requires the most energy to digest, which is why high-protein diets slightly increase your daily calorie burn compared to high-fat diets.
4. Exercise Activity Thermogenesis (EAT) (~5%)
This is the energy burned during intentional, structured exercise, such as lifting weights, running, or taking a cycling class. Interestingly, for most casual gym-goers, structured exercise accounts for the smallest percentage of their daily calorie expenditure.
How to Calculate Your TDEE
Because TDEE includes NEAT and EAT, measuring it perfectly requires a metabolic laboratory. However, we can use established scientific equations (like the Mifflin-St Jeor equation) combined with activity multipliers to get a highly accurate estimate.
The standard activity multipliers are:
- Sedentary: BMR × 1.2 (little or no exercise)
- Lightly Active: BMR × 1.375 (light exercise 1-3 days/week)
- Moderately Active: BMR × 1.55 (moderate exercise 3-5 days/week)
- Very Active: BMR × 1.725 (hard exercise 6-7 days/week)
- Extra Active: BMR × 1.9 (very hard exercise/physical job)
Next Steps
You don't need to do this math by hand. You can find your estimated daily burn instantly using our TDEE Calculator. Once you know your TDEE, you can use it to set your calorie goals for the day.