Free Clinical Tool
BMR / TDEE Calculator
Calculate Basal Metabolic Rate and Total Daily Energy Expenditure using the Mifflin-St Jeor equation. See calorie needs across five activity levels.
Basal Metabolic Rate (BMR) represents the number of calories your body needs at complete rest to maintain basic physiological functions — breathing, circulation, cell production, and temperature regulation. Total Daily Energy Expenditure (TDEE) builds on BMR by factoring in physical activity levels. Together, these values form the foundation of nutritional counseling and wellness planning. Health coaches use TDEE to set realistic calorie targets, naturopaths reference it for dietary protocol design, and physical therapists factor it into rehabilitation nutrition plans. The Mifflin-St Jeor equation, published in 1990, is considered the most accurate predictive equation for BMR in clinical use today.
How to Use This Calculator
Enter the patient's age, select their sex, and input height and weight in your preferred units. Choose the activity level that best describes their typical week. The calculator will show BMR (calories at rest) and TDEE values for all activity levels so you can discuss different scenarios with your patient.
Formula & Method
Mifflin-St Jeor equation — Male: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) + 5. Female: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) − 161. TDEE = BMR × Activity Factor, where factors are: Sedentary (1.2), Lightly Active (1.375), Moderately Active (1.55), Very Active (1.725), Extra Active (1.9).
Disclaimer
BMR and TDEE are estimates based on population averages. Individual metabolic rates vary based on genetics, body composition, hormonal status, medications, and other factors. These values should inform — not dictate — nutritional recommendations.
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