BMR Calculator
Determine the minimum daily calories your body burns at complete physical rest to sustain essential biological functions.
Important Clinical & Educational Notice
This health tool is engineered exclusively for general wellness, fitness, and educational orientation. Calculations are estimates based on standard population formulas and do not constitute personalized medical evaluation, diagnosis, prescription, or clinical treatment. Always consult certified physicians or registered dietitians before initiating significant dietary, fitness, or therapeutic changes.
Mifflin-St Jeor Basal Metabolic Formula
Basal Metabolic Rate (BMR) represents the minimum number of calories your body burns while performing basic, life-sustaining biological functions at rest (such as cellular repair, circulation, breathing, and temperature maintenance).
- •Men: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age in years) + 5
- •Women: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age in years) - 161
- •Endorsed by the Academy of Nutrition and Dietetics as the most reliable predictive formula for non-obese and obese adults.
- •Accounts for approximately 60% to 75% of your total daily caloric expenditure.
Limitations & Considerations
While clinical formulas provide valuable reference ranges, biological individuality plays a critical role in human physiology.
- •Equation estimates assume average body composition and do not directly measure lean muscle mass percentage.
- •Individuals with exceptionally high muscle mass burn more calories at rest than standard equations predict.
- •Endocrine disorders (hypothyroidism, Cushing syndrome) significantly alter real-world resting metabolic rate.
- •Direct measurement requires clinical indirect calorimetry in an overnight fasting laboratory environment.
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