Find your Total Daily Energy Expenditure — the exact number of calories you burn each day — and get personalized targets for every goal, from aggressive fat loss to maximum muscle gain.
Total Daily Energy Expenditure (TDEE) is the total number of calories your body burns in a 24-hour period. It is your true maintenance number — the caloric intake at which your body weight stays exactly the same. Eat consistently below your TDEE and you lose weight; eat above it and you gain weight. This makes TDEE the single most important number in any nutrition strategy, and the foundation that all calorie targets, diet plans, and body composition goals are built on.
TDEE is not a fixed value. It fluctuates day to day based on how much you move, the composition of what you eat, your stress levels, sleep quality, and even the ambient temperature. What calculators like this one produce is a reliable estimate, accurate to within ±10% for most people. The most effective approach is to use the calculator’s output as a starting point, then adjust by 100–200 calories every 2–3 weeks based on actual scale results.
BMR is the number of calories your body burns at complete rest — the energy required to keep your heart beating, lungs breathing, body temperature regulated, and cells functioning. Even if you lay motionless in bed for 24 hours, you would burn your BMR in calories. BMR is determined primarily by lean body mass, which explains why two people of the same weight but different body compositions have different BMRs: the one with more muscle mass burns more at rest.
NEAT is the calorie burn from all physical movement that is not structured exercise — walking to your car, fidgeting, typing, standing, household chores, and gesturing while talking. Research by Dr. James Levine at the Mayo Clinic has shown that NEAT can vary by up to 2,000 calories per day between individuals of similar size and activity level. This is the biggest source of variability in TDEE between people and the primary reason why some people seem to “eat anything and not gain weight.”
EAT is the calorie burn from intentional, structured exercise — gym sessions, runs, swim workouts, and classes. Despite being the component most people focus on, EAT is typically the smallest contributor to total daily expenditure for most non-athletes. A 60-minute weightlifting session burns approximately 200–400 calories, which represents only 8–15% of a 2,500-calorie TDEE. This is why exercise alone, without dietary adjustment, rarely produces substantial weight change.
TEF is the calorie cost of digesting, absorbing, and metabolizing the food you eat. Different macronutrients have different thermic effects: protein costs 20–30% of its calories to process, carbohydrates cost 5–10%, and fat costs only 0–3%. This is one of the metabolic reasons high-protein diets tend to produce slightly more weight loss at the same calorie intake — more of the protein calories are “spent” on digestion. Overall TEF averages about 10% of total calorie intake for a mixed diet.
Developed in 1990, the Mifflin-St Jeor equation is the current gold standard recommended by the Academy of Nutrition and Dietetics. It was validated against indirect calorimetry measurements in a large diverse population and produces results within 10% of actual measured metabolic rate for approximately 80% of people. It uses age, weight, height, and sex as inputs. Formula: Male: (10 × kg) + (6.25 × cm) − (5 × age) + 5 | Female: (10 × kg) + (6.25 × cm) − (5 × age) − 161
The original Harris-Benedict equation was published in 1919 and revised by Roza and Shizgal in 1984. It was the clinical standard for decades before Mifflin-St Jeor emerged. The revised version is reasonably accurate but tends to overestimate BMR by about 5% compared to Mifflin, particularly in overweight individuals. Formula: Male: (13.397 × kg) + (4.799 × cm) − (5.677 × age) + 88.362
The Katch-McArdle formula bypasses the limitation of both other equations by using lean body mass (LBM) rather than total body weight. This makes it significantly more accurate for athletic individuals with low body fat, and for anyone whose body composition differs substantially from average. If you have a reliable body fat percentage measurement, Katch-McArdle will produce the most personalized result. Formula: BMR = 370 + (21.6 × lean body mass in kg)
| Level | Multiplier | Who it fits | Common mistake |
|---|---|---|---|
| Sedentary | 1.2× | Desk job, no gym, <5,000 steps/day | Underestimating how sedentary you actually are |
| Light | 1.375× | 1–3 light gym sessions per week, some walking | Picking this when you go to gym 3× but sit 10h/day |
| Moderate | 1.55× | 3–5 hard sessions per week, active job or lots of walking | Most common overestimate — gym 3× + desk job is Light, not Moderate |
| Active | 1.725× | Hard training 6–7 days/week, or physically demanding job + gym | Reserved for genuinely high-volume athletes |
| Very Active | 1.9× | Elite athletes, military, double sessions, manual labor + gym | Very few people actually qualify for this level |
The single most common TDEE error is overestimating activity level. Research consistently shows that people who train 3–4 times per week but have sedentary desk jobs are best categorized as “Light” rather than “Moderate.” If your TDEE-based calorie target isn’t producing the expected results after 3–4 weeks, try dropping one activity level before adjusting macros.
| Goal | Daily adjustment | Expected rate | Best for |
|---|---|---|---|
| Aggressive fat loss | −750 cal | ~1.5 lb/week | Significant overweight, medically supervised |
| Moderate fat loss | −500 cal | ~1 lb/week | Standard fat loss, most people |
| Slow fat loss | −250 cal | ~0.5 lb/week | Near goal weight, athletes minimizing muscle loss |
| Maintenance | 0 cal | Weight stable | Body recomposition phase, diet breaks |
| Lean gain | +250 cal | ~0.25 lb/week | Experienced lifters minimizing fat gain |
| Moderate gain | +500 cal | ~0.5 lb/week | Intermediate trainees, standard bulk |
| Aggressive gain | +750 cal | ~0.75 lb/week | Underweight, beginners, young athletes |