TDEE Rechner

The Four Components of TDEE

Your total daily energy expenditure is the sum of four distinct processes:

• Basal Metabolic Rate (BMR) — 60–70%: The energy your body needs simply to stay alive. This is the largest component and is primarily determined by lean body mass, age, and sex.
• Thermic Effect of Food (TEF) — ~10%: The energy cost of digesting, absorbing, and storing nutrients. Protein has the highest thermic effect at 20–30%, followed by carbohydrates at 5–10%, and fats at 0–3%.
• Non-Exercise Activity Thermogenesis (NEAT) — 15–20%: All movement that is not planned exercise — walking, fidgeting, cooking, standing, and daily activities. NEAT can vary dramatically between individuals and is often the secret weapon for fat loss.
• Exercise Activity Thermogenesis (EAT) — 5–10%: Calories burned during intentional exercise sessions such as weight training, running, cycling, or sports.

Why Activity Level Matters

The activity multiplier applied to your BMR can significantly change your estimated TDEE. A sedentary person with a 1,600 kcal BMR may have a TDEE of only 1,920 kcal, while the same person at a “very active” level could have a TDEE of 2,760 kcal. Choosing the correct activity level is crucial for accurate results. Be honest about your actual activity — most people overestimate how active they are, leading to inflated TDEE estimates and difficulty losing weight.

The Real-World Verification Method

The most accurate way to find your true TDEE is through self-experimentation. Use this calculator to get a starting estimate, then eat that number of calories daily for two weeks while weighing yourself every morning. Take the weekly average of your weight. If your average weight stays the same, you have found your true maintenance. If you lost weight, your TDEE is higher than the estimate. If you gained weight, your TDEE is lower. Adjust by 100–200 calories and repeat until your weight stabilizes.

TDEE Changes Over Time

Your TDEE is not a fixed number. It changes as your body weight changes, as your activity patterns shift, and as you age. When dieting, metabolic adaptation can reduce your TDEE by 10–15% beyond what would be predicted from weight loss alone. This is why periodic diet breaks (eating at maintenance for 1–2 weeks every 8–12 weeks) can help reset hormones and improve long-term diet adherence. Recalculate your TDEE every 5–10 pounds of weight change.