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Reviewed by CalculatorApp.me Health Team
Total Daily Energy Expenditure formulas, BMR equations, activity multipliers, and evidence-based calorie science.
TDEE
Total Daily Energy Expenditure
BMR
60-75% of TDEE
NEAT
15-30% of TDEE
TEF
8-15% of TDEE
Free TDEE calculator — calculate your Total Daily Energy Expenditure using the Mifflin-St Jeor formula with BMR, macro breakdown, cutting and bulking calories.
Enter values above to see results.
How to calculate TDEE and use it for bulking, cutting, or maintenance.
Read article →Complete guide to daily energy expenditure and calorie targets.
Read article →Pair your TDEE with the right macronutrient targets.
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Evidence-based guide to calorie counting, macronutrient tracking, TDEE calculation, and using nutrition data to achieve weight loss, maintenance, or muscle gain goals.
Total Daily Energy Expenditure (TDEE) is the total number of calories your body burns in a 24-hour period. It represents the sum of all energy used for vital functions, digestion, physical activity, and non-exercise movement.
TDEE consists of four components: Basal Metabolic Rate (BMR) — calories burned at complete rest (60-75%); Thermic Effect of Food (TEF) — energy to digest food (8-15%); Exercise Activity Thermogenesis (EAT) — intentional exercise (5-10%); and Non-Exercise Activity Thermogenesis (NEAT) — fidgeting, walking, posture (15-30%).
Understanding your TDEE is the foundation of any nutrition plan. To lose weight, eat below TDEE (deficit); to gain weight, eat above (surplus); to maintain, eat at TDEE. A 500-calorie daily deficit yields approximately 1 pound of fat loss per week.
Men: BMR = 10×weight(kg) + 6.25×height(cm) − 5×age − 5 Women: BMR = 10×weight(kg) + 6.25×height(cm) − 5×age − 161 Example (30-year-old male, 80 kg, 178 cm): BMR = 10(80) + 6.25(178) − 5(30) − 5 BMR = 800 + 1112.5 − 150 − 5 BMR = 1,757.5 kcal/day TDEE = BMR × Activity Factor TDEE = 1,757.5 × 1.55 (moderate) TDEE = 2,724 kcal/day
Validated in 2005 ADA study as the most accurate predictive equation — within 10% for 82% of individuals.
Men: BMR = 88.362 + 13.397×wt(kg) + 4.799×ht(cm) − 5.677×age Women: BMR = 447.593 + 9.247×wt(kg) + 3.098×ht(cm) − 4.330×age Example (same 30M, 80kg, 178cm): BMR = 88.362 + 13.397(80) + 4.799(178) − 5.677(30) BMR = 88.362 + 1071.76 + 854.22 − 170.31 BMR = 1,844 kcal/day Note: Harris-Benedict tends to overestimate by 5% compared to Mifflin-St Jeor
The original 1919 equation, revised in 1984. Still widely used but Mifflin-St Jeor is preferred for accuracy.
BMR = 370 + 21.6 × Lean Body Mass (kg) Lean Mass = Weight × (1 − Body Fat %) Example (80 kg, 18% body fat): Lean Mass = 80 × (1 − 0.18) = 65.6 kg BMR = 370 + 21.6 × 65.6 BMR = 370 + 1,417 BMR = 1,787 kcal/day Best for: athletes & muscular individuals who know their body fat percentage
| Goal | Calorie Adjustment | Rate | Protein Target | Best For |
|---|---|---|---|---|
| Aggressive Cut | TDEE − 750-1,000 | 1.5-2 lbs/week | 1.2-1.4 g/kg | Short-term weight loss |
| Moderate Cut | TDEE − 500 | 1 lb/week | 1.0-1.2 g/kg | Sustainable fat loss |
| Mild Cut | TDEE − 250 | 0.5 lb/week | 0.8-1.0 g/kg | Preserving muscle |
| Maintenance | TDEE ± 0 | No change | 0.8 g/kg | Weight stability |
| Lean Bulk | TDEE + 250 | 0.5 lb/week | 1.6-2.2 g/kg |
Antoine Lavoisier demonstrated that respiration is a form of combustion, measuring heat and CO₂ output of guinea pigs. He coined 'calorie' as a unit of heat and established the foundation of metabolic science.
James Arthur Harris and Francis Gano Benedict published their landmark BMR equation based on measurements of 239 subjects. Despite being over 100 years old, the revised version remains in use today.
M.D. Mifflin and S.T. St Jeor published a new BMR prediction equation based on modern body compositions. Later validated by the ADA as 10% more accurate than Harris-Benedict for contemporary populations.
The doubly labeled water (DLW) technique became the gold standard for measuring TDEE in free-living conditions. It uses isotopes ²H and ¹⁸O in water to track CO₂ production over 1-2 weeks — the most accurate TDEE measurement method.
American Dietetic Association
Compared 4 BMR equations in 2,364 subjects. Mifflin-St Jeor was accurate within ±10% for 82% of individuals — significantly better than Harris-Benedict (69%), WHO (71%), and Owen (73%). Now recommended by the ADA.
Mayo Clinic / Dr. James Levine
NEAT varies by up to 2,000 kcal/day between individuals. Lean people stand and move 2.5 hours/day more than obese people, burning 350+ extra kcal/day. NEAT is the most modifiable TDEE component and the key to metabolic health.
Science (Pontzer et al., 2021)
Analyzing 6,421 individuals aged 8 days to 95 years, metabolism is truly stable from ages 20-60 (declining only 0.7%/year). The dramatic decline begins after 60. Infants have the highest metabolic rate relative to body size (50% above adult).
International Journal of Obesity
Your metabolism slows dramatically after age 30.
The 2021 Pontzer study of 6,421 people found metabolism is remarkably stable from ages 20-60, declining only 0.7%/year. The real decline starts after 60. Weight gain in your 30s-40s is primarily from reduced activity and increased intake.
Eating 6 small meals per day boosts metabolism.
Meal frequency has no significant effect on TDEE. The Thermic Effect of Food (TEF) is based on total calories and macros consumed — not how many meals they're split into. A systematic review of 15 studies found no metabolic advantage.
Starvation mode stops weight loss completely.
While metabolic adaptation is real (200-400 kcal/day decrease), it never prevents weight loss entirely. At severe caloric restriction, the body adapts by reducing NEAT, lowering thyroid hormones, and increasing hunger — but a deficit still produces loss.
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Most accurate for athletes and muscular individuals because it accounts for lean body mass directly.
Activity | Factor | Description ─────────────|────────|───────────────────────── Sedentary | 1.2 | Desk job, no exercise Light | 1.375 | Light exercise 1-3d/wk Moderate | 1.55 | Moderate exercise 3-5d/wk Active | 1.725 | Hard exercise 6-7d/wk Very Active | 1.9 | Athlete/physical job + exercise Example (BMR = 1,758): Sedentary: 2,109 kcal Moderate: 2,724 kcal Very Active: 3,340 kcal Difference: 1,231 kcal/day!
Most people overestimate their activity level. Start with one level lower than you think and adjust based on results.
| Muscle gain (minimal fat) |
| Bulk | TDEE + 500 | 1 lb/week | 1.4-2.0 g/kg | Muscle & strength gain |
Dr. James Levine at the Mayo Clinic published groundbreaking research on Non-Exercise Activity Thermogenesis (NEAT), showing it can vary by up to 2,000 calories/day between individuals and is the main reason some people resist weight gain.
The International Atomic Energy Agency published the largest-ever dataset of doubly labeled water TDEE measurements (6,621 individuals, 29 countries). It revealed that TDEE peaks at ages 20-40, then declines ~0.7%/year.
After losing 10%+ of body weight, TDEE drops by 200-400 kcal/day more than predicted — called 'adaptive thermogenesis.' This metabolic adaptation persists for 6-12 months, contributing to weight regain. Diet breaks may mitigate it.
Exercise is the main driver of calorie burn.
Exercise (EAT) accounts for only 5-10% of TDEE for most people. BMR is 60-75%, NEAT is 15-30%, and TEF is 8-15%. You can't outrun a bad diet — a 30-minute run burns ~300 kcal, one cheeseburger is 500+ kcal.