Estimate daily calories your body burns at rest using the Mifflin-St Jeor equation.
Estimate daily calories your body burns at rest using the Mifflin-St Jeor equation.
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Standard mathematical and financial formulation used for verified calculation.
Calculate body mass index using height and weight with a simple category result.
Estimate daily maintenance calories by combining BMR with your activity level.
Estimate daily calories for maintaining, losing, or gaining weight.
Estimate healthy body weight reference ranges using Devine, Robinson, Miller, and Hamwi formulas.
BMR (Basal Metabolic Rate) is the minimum number of calories your body needs to perform essential life-sustaining functions—such as breathing, circulation, cell production, nutrient processing, and temperature regulation—while at rest.
The Mifflin-St Jeor equation is considered the gold standard for BMR estimation: for men, BMR = 10 * weight (kg) + 6.25 * height (cm) - 5 * age (years) + 5; for women, BMR = 10 * weight (kg) + 6.25 * height (cm) - 5 * age (years) - 161.
BMR is the energy your body expends at absolute rest. Total Daily Energy Expenditure (TDEE) includes your BMR plus additional calories burned through physical activity, exercise, and digestion.
BMR formulas estimate energy based on weight and height but do not account for body composition. A highly muscular person will have a higher actual BMR than estimated, while a person with higher body fat may have a lower actual BMR.
BMR generally decreases as you age. This is primarily due to a natural loss of muscle tissue (sarcopenia) and changes in metabolic efficiency as hormone levels change over time.
Basal Metabolic Rate (BMR) represents the baseline caloric energy expenditure required by your body each 24-hour cycle to sustain essential organ and cellular functions—including respiration, circulation, nervous system operation, and core temperature maintenance—under complete physical and digestive rest.
This calculator applies the Mifflin-St Jeor equation, widely acknowledged in clinical dietetics as the most reliable predictive formula for modern adults: Men: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age) + 5; Women: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age) - 161.
Resting vs. Active Expenditure: BMR measures resting maintenance only. Total Daily Energy Expenditure (TDEE) integrates physical activity, non-exercise activity thermogenesis (NEAT), and the thermic effect of food by scaling BMR with an activity multiplier between 1.2 (sedentary) and 1.9 (extremely active).
Nutritional Context: Caloric targets for weight loss, maintenance, or muscle gain should be accompanied by balanced macronutrients (protein, complex carbohydrates, healthy fats) and progressive resistance training rather than aggressive, unmonitored caloric restriction.