TDEE Calculator
Total Daily Energy Expenditure
The TDEE Calculator helps you estimate exactly how many calories you burn in a day. Knowing your Total Daily Energy Expenditure is the scientifically proven starting point for any weight loss or muscle building plan.
Inputs Explained
- BMR Stats: Sex, Age, Height, Weight determine your baseline metabolic rate.
- Activity Level: This multiplier accounts for your daily movement, job type, and dedicated exercise.
Method
We calculate your BMR using the Mifflin-St Jeor equation and then apply standard activity multipliers (Katch-McArdle/Harris-Benedict derived factors) to find your total daily burn.
Formula
TDEE = BMR × Activity
Multiplier
Sedentary: ×1.2 | Light: ×1.375
Moderate: ×1.55 | Active: ×1.725
Activity Levels
| Sedentary | Desk job, no exercise |
| Light | 1-3 days/week |
| Moderate | 3-5 days/week |
| Active | 6-7 days/week |
| Very Active | Athlete/physical job |
Related Calculators
Complete Guide to TDEE and Daily Energy
Your Total Daily Energy Expenditure (TDEE) is the most important number for changing your body weight. Unlike BMR, which is static while you rest, TDEE accounts for everything you do—from sleeping to sprinting.
Step-by-Step Example
Let's calculate the TDEE for a sample profile:
- Profile: Male, 25 years old, 170 cm, 70 kg.
- Calculated BMR: ~1,643 calories/day (using Mifflin-St Jeor).
- Activity Level: Moderately Active (exercises 3-5 days/week). Multiplier: 1.55.
Calculation:
- Formula: TDEE = BMR × Activity Multiplier
- Math: 1,643 × 1.55 = 2,546.65
- Rounding: 2,547 calories/day.
Strict Result: To maintain his current weight of 70 kg, he needs to eat approx. 2,550 calories daily.
Use Cases
- Maintenance: Eating exactly your TDEE keeps your weight stable ("Isocaloric diet").
- Cut (Weight Loss): Eating 500 calories below TDEE (e.g., 2,050 cal) theoretically yields 1 lb of fat loss per week.
- Bulk (Muscle Gain): Eating 250-500 calories above TDEE supplies the energy required to build new muscle tissue.
Assumptions & Limitations
- Self-Reporting Error: Validated studies show people overestimate their activity levels by 20-50%. If you claim "Moderate" but sit 14 hours a day, the result will be too high.
- NEAT Variability: Non-Exercise Activity Thermogenesis (fidgeting, pacing) varies wildly between people and isn't captured perfectly by standard multipliers.
- Adaptive Thermogenesis: As you diet, your TDEE drops faster than weight loss alone predicts, because your body becomes more efficient to save energy.
Sources & References
- Levine, J. A. (2002): Non-exercise activity thermogenesis (NEAT). Encyclopedia of Energy. Explains why some people burn more calories without gym time.
- Schoeller, D. A. (1990): How accurate is self-reported dietary energy intake? Nutrition Research Reviews. Highlights the difficulty in tracking.
- American College of Sports Medicine (ACSM): Guidelines for exercise testing and prescription. Source of activity multipliers.
- Harvard Health Publishing: Calorie counting made easy.
Frequently Asked Questions
TDEE (Total Daily Energy Expenditure) is the total number of calories you burn in a 24-hour period from all sources: staying alive (BMR), digesting food (TEF), and moving (Activity). It is the most critical number for weight control because it establishes your 'maintenance' level.
Be honest and conservative. 'Sedentary' applies to most office jobs. 'Lightly Active' means you spend time on your feet or exercise 1-3 times a week. 'Moderately Active' is for consistent 3-5 day/week training. Overestimating activity is the #1 reason for calcuation errors.
Common culprits include: underestimating calorie intake (hidden oils/sauces), overestimating activity calories, water retention masking fat loss, or a TDEE that has lowered due to metabolic adaptation. Track accurately for 2 weeks before adjusting.
A standard, safe deficit is 500 calories below your TDEE, which yields approximately 0.5kg (1lb) of fat loss per week. Aggressive deficits (>1000 calories) are generally unsustainable and risk muscle loss.
Yes. As you lose weight, you require less energy to move your smaller body, and your NEAT (fidgeting, subconscious movement) often decreases. This 'metabolic adaptation' means you must periodically recalculate your TDEE.
Recalculate your TDEE for every 5-10 lbs (2-5 kg) of weight lost. This ensures your calorie target remains appropriate for your new body weight and prevents plateaus.
Generally, no. If you used the appropriate activity multiplier (e.g., 'Moderately Active') to calculate TDEE, your exercise is already accounted for. Adding exercise calories on top would be 'double dipping' and likely halt weight loss.