Total Daily Energy Expenditure (TDEE) Calculator
Calculate total daily energy expenditure incorporating Basal Metabolic Rate (BMR), physical activity multipliers, Thermic Effect of Food (TEF), and Non-Exercise Activity Thermogenesis (NEAT) for precision caloric planning.
# Calculation Pipeline (Chain of Thought)
- Step 1 (Basal Metabolic Rate): Compute resting baseline via Mifflin-St Jeor:
Men: (10 × kg) + (6.25 × cm) - (5 × age) + 5; Women: (10 × kg) + (6.25 × cm) - (5 × age) - 161. - Step 2 (Activity Scaling Multiplier): Multiply BMR by validated PAL coefficient:
Sedentary (1.2), Light (1.375), Moderate (1.55), Heavy (1.725), or Athlete (1.9). - Step 3 (Energy Partitioning Model): Model components:
TDEE = BMR (60-70%) + NEAT (15%) + EAT (5-10%) + TEF (10%). - Step 4 (Target Caloric Energy Balance): Set intake threshold:
Fat Loss = TDEE - 500 kcal/day (approx. 1 lb/0.45 kg loss/wk); Hypertrophy = TDEE + 300 kcal/day.
Decision Rule: Energy Balance Rule: For sustainable body composition changes, maintain caloric deficit between 15% and 25% below TDEE to preserve lean mass.
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| TOTAL DAILY ENERGY EXPENDITURE (TDEE) |
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[ Weight, Height, Age, Sex ] ---> [ Mifflin-St Jeor / Katch Engine ]
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v
[ Basal Rate (BMR) ] (~65%)
+
[ Thermic Food (TEF) ] (~10%)
+
[ Non-Exercise (NEAT) ] (~15%)
+
[ Exercise Burn (EAT) ] (~10%)
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v
[ TOTAL DAILY TDEE (100%) ]
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+------------------------------------+-----------------------------------+
v v v
[ Deficit (-500 kcal) ] [ Maintenance (±0) ] [ Surplus (+300 kcal) ]
-> Fat Loss (~1 lb/wk) -> Weight Equilibrium -> Lean Mass Accretion
Frequently Asked Questions
What is the difference between BMR and TDEE?
BMR (Basal Metabolic Rate) represents the calories your body consumes purely to maintain life in a resting, post-absorptive state. TDEE includes BMR plus physical exercise (EAT), spontaneous daily movement (NEAT), and the thermic effect of digesting food (TEF).
How do I pick the right activity level to prevent overestimating TDEE?
Most desk-workers who exercise 3-4 days per week fall under "Lightly Active" (1.375) or "Moderately Active" (1.55). Choosing too high of an activity multiplier is the single most common reason calorie deficits fail.
What is adaptive thermogenesis and metabolic slowdown?
During extended caloric restriction, the body decreases resting metabolic rate and unconscious movement (NEAT) beyond what is predicted by weight loss alone. Periodic diet breaks and high-protein intake mitigate this downregulation.
How often should I recalculate my TDEE?
Recalculate your TDEE every 10 to 15 pounds (4.5–7 kg) of body weight change, or whenever your weekly training volume and occupation activity patterns shift substantially.
Strategic Caloric & Energy Checklists
- The 10-Day Moving Weight Average: Never adjust caloric intake based on single-day scale fluctuations. Log daily morning weights under identical conditions and adjust calories only when the 10-day rolling average stalls.
- NEAT Preservation During Deficits: When dieting, spontaneous NEAT unconsciously drops by up to 300 kcal/day. Anchor daily step counts (e.g. 8,000–10,000 steps) to prevent metabolic compensation.
- Protein Sparing Macro Floor: Anchor dietary protein at 0.8–1.0g per pound of body weight (1.8–2.2g/kg) during caloric deficits to maximize muscle retention and utilize high TEF (20–30% for protein).
- Diet Break & Refeed Cycling: Incorporate 48-hour carbohydrate refeed intervals every 3–4 weeks of sustained caloric restriction to replenish glycogen stores and temporarily normalize leptin levels.