How to Calculate Your TDEE
What is TDEE and why does it matter?
Total Daily Energy Expenditure (TDEE) is the total number of calories your body burns in a day, combining your basal metabolic rate (BMR) with activity. Knowing your TDEE is the foundation for any calorie-based nutrition goal -- fat loss, maintenance, or muscle gain.
TDEE is composed of four components:
- Basal Metabolic Rate (BMR): Calories burned at complete rest to sustain vital functions. Accounts for 60-75% of TDEE.
- Thermic Effect of Food (TEF): Energy used to digest, absorb, and process food. Accounts for roughly 10% of TDEE. Protein has the highest TEF at 20-30% of its calories.
- Exercise Activity Thermogenesis (EAT): Calories burned during intentional exercise. Typically 5-15% of TDEE.
- Non-Exercise Activity Thermogenesis (NEAT): Calories burned through daily movement -- walking, fidgeting, standing. Can range from 15-50% of TDEE depending on occupation and habits.
According to the American Council on Exercise, most calorie estimation errors come from overestimating EAT (exercise) and underestimating the importance of NEAT (daily movement).
How do I calculate my BMR?
The two most widely used BMR formulas are Mifflin-St Jeor (based on weight, height, and age) and Katch-McArdle (based on lean body mass). Mifflin-St Jeor is recommended for most people; Katch-McArdle is more accurate if you know your body fat percentage.
Mifflin-St Jeor Equation (1990)
Validated as the most accurate BMR formula for the general population by the American Dietetic Association (Frankenfield et al., 2005).
- Men: BMR = (10 x weight in kg) + (6.25 x height in cm) - (5 x age) + 5
- Women: BMR = (10 x weight in kg) + (6.25 x height in cm) - (5 x age) - 161
Example: A 30-year-old male, 80 kg, 180 cm tall:
BMR = (10 x 80) + (6.25 x 180) - (5 x 30) + 5 = 800 + 1,125 - 150 + 5 = 1,780 calories
Katch-McArdle Equation
Uses lean body mass (LBM), making it more accurate for people who know their body fat percentage.
- BMR = 370 + (21.6 x lean body mass in kg)
- Lean body mass = weight x (1 - body fat percentage as decimal)
Example: An 80 kg person at 15% body fat:
LBM = 80 x 0.85 = 68 kg
BMR = 370 + (21.6 x 68) = 370 + 1,469 = 1,839 calories
Comparison of BMR formulas
| Formula | Inputs Required | Best For | Accuracy |
|---|---|---|---|
| Mifflin-St Jeor | Weight, height, age, sex | General population | Within 5-10% for most adults |
| Katch-McArdle | Lean body mass | Athletes, known body fat % | Within 3-5% if body fat is accurate |
| Harris-Benedict (1919) | Weight, height, age, sex | Historical reference | Overestimates by 5-15% on average |
Note: The Harris-Benedict equation, while still widely referenced online, consistently overestimates BMR by 5-15% in modern validation studies and is no longer recommended by the American Dietetic Association.
What activity multiplier should I use?
Multiply your BMR by an activity factor of 1.2 (sedentary) to 1.9 (elite athlete) to estimate TDEE. Most people overestimate their activity level -- when in doubt, choose one level lower than you think.
| Activity Level | Multiplier | Description | Example |
|---|---|---|---|
| Sedentary | 1.2 | Desk job, little to no exercise | Office worker who does not exercise |
| Lightly Active | 1.375 | Light exercise 1-3 days/week | Office worker who walks 30 min daily |
| Moderately Active | 1.55 | Moderate exercise 3-5 days/week | 3-4 gym sessions per week |
| Very Active | 1.725 | Hard exercise 6-7 days/week | Daily training + active job |
| Extremely Active | 1.9 | Intense daily training + physical job | Professional athlete in-season |
TDEE = BMR x Activity Multiplier
Example: BMR of 1,780 x 1.55 (moderately active) = 2,759 calories per day
A common mistake is selecting "Very Active" because you exercise hard 4 days a week. However, if you sit at a desk for 8-10 hours the other days, "Moderately Active" (1.55) is typically more accurate. Activity multipliers account for all daily movement, not just gym time.
How should I adjust calories based on my goal?
For fat loss, subtract 300-500 calories from TDEE. For muscle gain, add 200-350 calories. A deficit greater than 500 calories significantly increases muscle loss risk, and a surplus above 500 adds more fat than muscle.
| Goal | Calorie Adjustment | Expected Rate of Change | Key Consideration |
|---|---|---|---|
| Aggressive fat loss | -500 to -750 kcal | 1-1.5 lbs/week | Higher muscle loss risk; increase protein to 2.2-2.4 g/kg |
| Moderate fat loss | -300 to -500 kcal | 0.5-1 lb/week | Sustainable for 12-16 weeks; recommended for most people |
| Maintenance | 0 kcal | Weight stable | Good for body recomposition when combined with resistance training |
| Lean bulk | +200 to +350 kcal | 0.5-1 lb/month (muscle) | Minimizes fat gain; best for intermediate+ lifters |
| Aggressive bulk | +350 to +500 kcal | 1-2 lbs/month (muscle + some fat) | Better for beginners who gain muscle faster |
Research from Hall et al. (2011, The Lancet) established that a sustained 500-calorie daily deficit produces approximately 1 pound of weight loss per week, though the rate slows over time as metabolic adaptation occurs. The body reduces NEAT and BMR by 5-15% during prolonged deficits -- a process known as adaptive thermogenesis.
How do I know if my TDEE estimate is accurate?
The only way to validate your TDEE is by tracking real-world results: weigh yourself daily, take a weekly average, and adjust if your weight trend does not match your goal after 2-3 weeks.
No formula is perfectly accurate for every individual. Metabolic variation between people of the same height, weight, and age can differ by 200-300 calories. Here is the validation process:
- Calculate your estimated TDEE using the method above
- Set your calorie target based on your goal (deficit, maintenance, or surplus)
- Track intake consistently for 2-3 weeks using a food logging app
- Weigh yourself daily at the same time (morning, after bathroom, before eating) and calculate the weekly average
- Evaluate the trend:
- Losing too fast (more than 1.5 lbs/week)? Add 200 calories
- Not losing? Subtract 200 calories
- Gaining when you should not be? Subtract 300 calories and audit tracking accuracy
- Adjust by 100-200 calories at a time and re-evaluate after another 2 weeks
Can an app calculate TDEE automatically?
Yes. Modern apps combine formula-based estimates with real-world data (body weight trends, activity from wearables) to refine your TDEE over time, producing a more accurate number than any static formula.
DEEP calculates your initial TDEE from your profile data (weight, height, age, activity level) and sets macro-specific calorie targets based on your selected goal. As you log food and your body weight trends become visible, you can adjust targets accordingly. Because DEEP also tracks sleep, HRV, and workout load, you can see how calorie changes affect your recovery and performance -- not just the number on the scale.
Regardless of which method you use, remember: TDEE is an estimate, not a fixed number. It changes with your weight, activity, sleep, stress, and even the seasons. The most successful approach is to start with a well-calculated estimate, track consistently, and adjust based on what your body actually does over 2-4 week periods.