Scientifically estimate your daily calorie needs based on basal metabolic rate (BMR) and activity level.Developed using validated equations (Mifflin‑St Jeor, 1990) — the gold standard for clinical nutrition.
Total Daily Energy Expenditure (TDEE) represents the total number of calories your body burns in 24 hours, encompassing basal metabolic rate (BMR), physical activity, and the thermic effect of food (TEF). Accurate TDEE estimation is the cornerstone of evidence-based weight management, athletic performance, and clinical nutrition. This calculator implements the Mifflin‑St Jeor equation, validated by the Academy of Nutrition and Dietetics as the most reliable predictive equation for resting metabolic rate in non‑obese and overweight individuals.
Mifflin‑St Jeor (1990):
For men: BMR = (10 × weight in kg) + (6.25 × height in cm) – (5 × age) + 5
For women: BMR = (10 × weight in kg) + (6.25 × height in cm) – (5 × age) – 161
Reference: Mifflin MD et al. "A new predictive equation for resting energy expenditure in healthy individuals." Am J Clin Nutr. 1990.
TDEE = BMR × Physical Activity Coefficient (PAL). The multipliers follow the standardized classification by the FAO/WHO/UNU (2001) and are widely adopted in clinical practice:
| Activity Level | Multiplier | Description |
|---|---|---|
| Sedentary | 1.2 | Office work, minimal daily movement, no structured exercise |
| Lightly Active | 1.375 | Light exercise/sports 1–3 days/week |
| Moderately Active | 1.55 | Moderate exercise 3–5 days/week |
| Very Active | 1.725 | Hard exercise 6–7 days/week |
| Extremely Active | 1.9 | Athletes, physical labor, twice-daily training |
Emily, 34 years, 78 kg, 168 cm, lightly active. Her BMR = 1514 kcal, TDEE = 2082 kcal. To lose 0.5 kg per week, a 500 kcal deficit was implemented (≈1582 kcal/day). Over 12 weeks, combined with resistance training, she achieved 6 kg fat loss while preserving lean mass. This aligns with research showing that personalized TDEE-based deficits improve adherence and metabolic adaptation. Always consult a dietitian before extreme deficits.
While predictive equations offer excellent population-level estimates, individual BMR can vary ±10% due to genetics, body composition (muscle-to-fat ratio), hormonal status, and adaptive thermogenesis. For athletes or individuals with high muscle mass, the Katch‑McArdle equation (using lean body mass) may provide superior accuracy. Our calculator uses the Mifflin‑St Jeor formula, validated for diverse populations, but for clinical precision, indirect calorimetry remains the gold standard.
Total calorie intake determines weight change, but macronutrient distribution influences body composition, satiety, and metabolic health. The USDA Dietary Guidelines recommend 45–65% carbohydrates, 10–35% protein, and 20–35% fat. Our macro suggestions follow a balanced 30% protein, 40% carbs, 30% fat framework suitable for active individuals. For fat loss, higher protein (1.6–2.2 g/kg) can preserve lean mass. For muscle gain, a slight surplus with adequate protein (1.6 g/kg) and carbohydrates is recommended.