Daily Calorie & Basal Metabolic Rate Calculator (BMR / TDEE)
Calculate your basal metabolic rate, total daily energy expenditure, and macronutrient targets tailored to your weight and fitness goals.
Recommended caloric intake to achieve your chosen physique goal
Calories burned at complete rest to keep organs, heart, and brain alive
Exact calories required to maintain current weight at your activity level
Recommended Daily Macronutrient Breakdown
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Check out our official BMI calculator with WHO healthy weight thresholds.
Understanding Basal Metabolic Rate (BMR) and TDEE
To lose fat, build lean muscle, or maintain optimal wellness, the foundational biological rule is energy balance: the mathematical relationship between calories consumed and calories expended.
BMR (Basal Metabolic Rate)
BMR (Basal Metabolic Rate) represents the absolute number of calories your body burns in 24 hours at complete physical and digestive rest: keeping your heart pumping, lungs breathing, brain functioning, and body temperature regulated.
TDEE (Total Daily Energy Expenditure)
TDEE (Total Daily Energy Expenditure) adds Thermic Effect of Food (TEF), Non-Exercise Activity Thermogenesis (NEAT: walking, fidgeting), and purposeful exercise to your BMR. This is your true maintenance number.
Mifflin-St Jeor vs. Harris-Benedict Equations
Published in 1990, the Mifflin-St Jeor formula is recognized by the Academy of Nutrition and Dietetics as the most accurate predictive equation for modern lifestyles without direct laboratory calorimetry. The original 1919 Harris-Benedict formula (revised in 1984) tends to slightly overestimate daily needs for sedentary individuals.
Homme : 10×P + 6.25×T - 5×A + 5
Femme : 10×P + 6.25×T - 5×A - 161
Homme : 88.36 + 13.4×P + 4.8×T - 5.68×A
Femme : 447.6 + 9.25×P + 3.1×T - 4.33×A
Average Caloric Intake Reference by Age and Gender
Données indicatives moyennes pour des personnes de poids sain avec une activité modérée (sport 3-5 jours/semaine).
| Age Group | Men (Moderate Activity) | Women (Moderate Activity) | Avg Male BMR | Avg Female BMR |
|---|---|---|---|---|
| 18 - 29 ans | 2 600 kcal | 2 100 kcal | 1 750 kcal | 1 400 kcal |
| 30 - 49 ans | 2 450 kcal | 1 950 kcal | 1 680 kcal | 1 350 kcal |
| 50 - 69 ans | 2 250 kcal | 1 850 kcal | 1 550 kcal | 1 280 kcal |
| 70 ans et + | 2 050 kcal | 1 700 kcal | 1 420 kcal | 1 200 kcal |
Frequently Asked Questions about Calories and Metabolism
What is the optimal caloric deficit to lose fat without losing muscle?
A caloric deficit between 300 and 500 kcal per day is the clinical gold standard, yielding 1.2 to 2 kg of sustainable fat loss per month. Larger deficits above 700 kcal trigger muscle catabolism, chronic fatigue, and severe leptin drop causing binge eating.
Why should you never eat below your BMR?
Eating below your BMR deprives vital organs of the raw energy required for survival. The body responds with adaptive thermogenesis: lowering thyroid hormone production, downregulating sex hormones, and crashing spontaneous activity, causing weight loss plateaus.
How are macronutrient grams calculated from total calories?
Macronutrients supply distinct energy yields: 1 g protein = 4 kcal, 1 g carbohydrate = 4 kcal, and 1 g fat = 9 kcal. On a 2,000 kcal diet with 30% protein / 40% carbs / 30% fats: you consume 150 g protein (600 kcal), 200 g carbohydrates (800 kcal), and 67 g fats (600 kcal).
How often should you recalculate your calorie targets?
Recalculate your BMR and TDEE every 3 to 5 kg (7 to 11 lbs) of body weight change. As body mass changes, the energy required to support and move the body adjusts proportionally.
About the Calorie & BMR / TDEE Calculator & Nutrition Guide
Automated calculation optimization & decision support
Automated optimization: Predictive target heart rate zone calibration (advanced Karvonen formula based on heart rate reserve), personalized cardiovascular strain analysis, and metabolic modeling tailored to your body composition.