TDEE Calculator
Calculate your Total Daily Energy Expenditure based on your body stats and activity level. Understand the four components of TDEE — BMR, TEF, NEAT, and exercise — and how to use your number for any goal.
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Enter your values above to see the results.
Tips & Notes
- ✓NEAT (non-exercise activity thermogenesis) varies by 500–1,000 kcal between individuals — a person in a standing, active job can have TDEE 600+ kcal higher than a sedentary person of the same size and gym habits.
- ✓Validate your TDEE empirically: eat exactly your calculated TDEE for 2 weeks while weighing daily. If weight stays stable, your TDEE is accurate. If it drifts, adjust by 100–200 kcal and repeat.
- ✓TDEE decreases as you lose weight — plan to recalculate every 5 kg of body weight change to keep your calorie targets aligned with your actual current metabolism.
- ✓Metabolic adaptation can reduce TDEE by 100–300 kcal below what formula-based estimates predict after sustained calorie restriction. A 1–2 week diet break at maintenance calories can partially restore it.
- ✓TDEE is highest in the early-to-mid 20s and declines by roughly 50–100 kcal per decade after age 30, primarily due to lean mass loss — resistance training is the most effective way to slow this decline.
Common Mistakes
- ✗Selecting "very active" or "extremely active" based on gym frequency alone — these multipliers apply to people with physically demanding occupations plus regular structured training, not just frequent gym-goers.
- ✗Using the same TDEE target for months without recalculating — as weight decreases, TDEE decreases, so a target that created a deficit at higher body weight may be at maintenance later.
- ✗Ignoring NEAT as a lever — structured exercise burns far fewer calories than most people believe, while increasing daily movement (steps, standing, active commuting) can add 300–600 kcal to daily expenditure.
- ✗Treating the TDEE estimate as exact — all formula-based TDEE calculations have a ±10–15% error range for individuals; empirical validation over 2 weeks gives a much more accurate personal TDEE.
- ✗Confusing BMR with TDEE when setting calorie targets — eating at BMR level while living a normal life creates a very large deficit that risks muscle loss and metabolic adaptation.
TDEE Calculator Overview
TDEE is not one number — it is the sum of four distinct energy systems. Understanding each component explains why two people with the same weight and exercise routine can have TDEE values that differ by 500 kcal.
TDEE calculation — BMR × activity factor:
TDEE = BMR × Activity Factor Mifflin-St Jeor BMR: Male: BMR = (10 × weight kg) + (6.25 × height cm) − (5 × age) + 5 Female: BMR = (10 × weight kg) + (6.25 × height cm) − (5 × age) − 161 Activity Factors: Sedentary ×1.20 | Light ×1.375 | Moderate ×1.55 | Very Active ×1.725 | Extremely Active ×1.90
EX: Male, age 35, 82 kg, 176 cm, moderately active BMR = (10 × 82) + (6.25 × 176) − (5 × 35) + 5 = 820 + 1,100 − 175 + 5 = 1,750 kcal TDEE = 1,750 × 1.55 = 2,713 kcal/day To lose 0.5 kg/week: eat 2,713 − 500 = 2,213 kcal/day To gain 0.25 kg/week: eat 2,713 + 250 = 2,963 kcal/day
Calorie deficit and surplus for different goals:
The four components of TDEE: BMR (Basal Metabolic Rate): 60–70% of TDEE TEF (Thermic Effect of Food): 8–10% of TDEE NEAT (Non-Exercise Activity Thermogenesis): 15–50% of TDEE EAT (Exercise Activity Thermogenesis): 5–15% of TDEE
EX: Two people, same BMR of 1,700 kcal, same 3 workouts per week (+150 kcal each): Person A — sedentary office job, minimal daily movement: NEAT ~300 kcal → TDEE ~2,320 kcal Person B — active job (teacher, nurse, retail), constant movement: NEAT ~900 kcal → TDEE ~2,920 kcal Difference: 600 kcal/day from NEAT alone — despite identical formal exercise habits. This is why two people doing the same gym program lose weight at very different rates.
Activity level multipliers — full TDEE scale:
| TDEE component | % of total | What drives it | Can you change it? |
|---|---|---|---|
| BMR | 60–70% | Body size, lean mass, age, sex, thyroid | Slowly — via muscle gain or loss |
| TEF (digesting food) | 8–10% | Macronutrient composition of diet | Slightly — more protein = higher TEF |
| NEAT (daily movement) | 15–50% | Job type, steps, fidgeting, posture | Yes — the most controllable variable |
| Exercise (EAT) | 5–15% | Training volume, intensity, frequency | Yes — but smaller impact than most think |
TDEE-based calorie targets by goal:
| Scenario | Effect on TDEE | Timeframe |
|---|---|---|
| Losing 10 kg of body weight | −150 to −250 kcal/day | Months |
| Metabolic adaptation during dieting | −100 to −300 kcal extra | 6–12 weeks |
| Gaining 5 kg of muscle mass | +65 to +100 kcal/day | 6–18 months |
| Adding 3,000 daily steps | +100 to +150 kcal/day | Immediate |
| Switching desk job to active job | +400 to +800 kcal/day | Immediate |
TDEE is not static — it is a moving target. As you lose weight, your BMR decreases because there is less body mass to maintain. Metabolic adaptation (also called adaptive thermogenesis) adds an additional reduction of 100–300 kcal beyond what weight change alone would predict, driven by the body downregulating energy expenditure in response to sustained restriction. This is why the same deficit that produced 0.5 kg/week of loss in month one produces 0.2 kg/week in month four. Recalculating TDEE every 4–6 weeks, or every 5 kg of body weight change, keeps your targets calibrated to your actual current metabolism.
Frequently Asked Questions
NEAT stands for Non-Exercise Activity Thermogenesis — all the calories burned through movement that is not formal exercise: walking around the house, standing, fidgeting, gesturing while talking, climbing stairs, doing chores. Research shows that NEAT varies by up to 2,000 kcal per day between individuals of similar size, and is one of the primary reasons some people appear to eat a lot without gaining weight. In contrast, a typical one-hour gym session burns only 200–400 kcal above resting. Increasing daily step count from 3,000 to 10,000 adds roughly 300–400 kcal of daily burn — equivalent to a significant workout — through NEAT alone.
Population-level TDEE formulas like Mifflin-St Jeor have a margin of error of approximately ±10–15% for individuals. For a person with a calculated TDEE of 2,500 kcal, the actual TDEE could realistically be anywhere from 2,125 to 2,875 kcal. Factors the formula cannot capture include individual thyroid function, gut microbiome efficiency, genetic metabolic variation, and muscle fiber type composition. The most accurate way to determine your personal TDEE is empirically: eat exactly the calculated amount for 2 weeks while tracking weight daily, then adjust based on whether weight trends up, down, or stays flat.
This is metabolic adaptation — also called adaptive thermogenesis. When you sustain a calorie deficit, your body responds by reducing energy expenditure through mechanisms beyond simple weight loss: reduced body temperature, lowered spontaneous physical activity (you fidget less, move more slowly without realizing it), more efficient muscle contraction, and hormonal changes including lower leptin and higher ghrelin. These adaptations collectively reduce TDEE by 100–300 kcal beyond what your lighter body weight would predict. A planned diet break of 1–2 weeks at maintenance calories can partially reverse these adaptations before continuing a cut.
The most reliable check is 2 weeks of body weight data while eating exactly your calculated TDEE. Weigh yourself every morning under identical conditions (after waking, after bathroom, before eating). Average the daily weights from week 1 and compare to the average from week 2. If your weight is stable within 0.3 kg, your activity multiplier was accurate. If you gained weight, your actual TDEE is lower — drop one activity level. If you lost weight while eating at calculated TDEE, your actual TDEE is higher — move up one level. This empirical approach is more accurate than any formula.
TDEE is the correct reference for setting calorie targets during a diet — BMR is not a practical target. BMR is the energy needed at complete rest; the moment you get up and move through a normal day, you are burning well above BMR. Eating at BMR while living normally creates a very large deficit (typically 700–1,200 kcal below true TDEE) that accelerates muscle loss, increases fatigue, and triggers stronger metabolic adaptation. The safe lower limit for most people is TDEE minus 500 to 750 kcal, keeping intake above approximately 1,200 kcal/day for women and 1,500 kcal/day for men in absolute terms.
As body weight decreases, TDEE decreases for two reasons. First, a smaller body requires less energy to maintain — every kilogram of body mass reduction lowers BMR by roughly 15–25 kcal. Losing 10 kg therefore reduces BMR by 150–250 kcal. Second, metabolic adaptation adds another 100–300 kcal reduction beyond this. Combined, losing 10 kg can reduce TDEE by 250–550 kcal total. This is why the calorie target that produced 0.5 kg/week of loss at 90 kg may produce only 0.1–0.2 kg/week at 80 kg without adjustment. Regular recalculation every 4–6 weeks or every 5 kg of weight change keeps targets accurate.