BMR & TDEE Calorie Calculator
Calculate Basal Metabolic Rate (Mifflin-St Jeor) and Total Daily Energy Expenditure (TDEE). Estimates only.
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What Is This Calculator?
Calculate Basal Metabolic Rate (Mifflin-St Jeor) and Total Daily Energy Expenditure (TDEE). Estimates only.
Interpreting Health & Biometric Scores
Biometric calculations serve as informative screening guides and should always be discussed with a certified healthcare physician.
Values below clinical target ranges may suggest nutritional deficiencies, low body mass, or lower caloric expenditure.
Values within the median band align with standard WHO and clinical health wellness guidelines.
Elevated numbers indicate higher metabolic load, higher mass, or higher exertion levels.
How To Use This Calculator
BMR & TDEE Calorie Calculator Formula & Calculation Methodology
Basal Metabolic Rate (BMR) represents the baseline number of calories your body expends in 24 hours at complete rest to maintain vital involuntary functions (respiration, circulation, cellular repair).
Calculation Methodology:This calculator utilizes the clinically validated Mifflin-St Jeor equation. Mass contributes positively (10 kcal per kg of weight), height contributes positively (6.25 kcal per cm of stature), age contributes negatively (−5 kcal per year due to metabolic decline), and sex factor S (+5 for biological males, −161 for biological females) adjusts for average lean tissue mass differences.
WHAS- •Increasing weight or height increases daily calorie requirements.
- •Each decade of age reduces resting calorie burn by 50 calories per day.
- •Physical activity multipliers can increase daily maintenance energy by 20% to 90% above baseline BMR.
Live Worked Example: Real-Time Substitution
Calculation Summary: Using your currently entered input values (Weight: 70 kg, Height: 175 cm, Age: 28 Yrs, Gender: male), the in-browser calculation engine executes the formula in real time, yielding TDEE Maintenance Calories: 2571 kcal / day.
How Many Calories Do You Burn Just Resting?
Even when you spend a relaxing weekend resting in bed, your body is working hard! Your heart beats, lungs breathe, brain thinks, and body temperature stays regulated. For a 25-year-old person weighing 68 kg and 172 cm tall, their Basal Metabolic Rate (BMR) is roughly 1,600 calories per day at complete rest.
Common Calculation Mistakes to Avoid
Your brain makes up only about 2% of your total body weight, but it consumes over 20% of your resting BMR energy every single day!
- •Building lean muscle through strength training increases your resting BMR because muscle burns more calories at rest than fat tissue.
- •Multiply your BMR by 1.2 if sedentary, or by 1.55 if moderately active, to find your true weight-maintenance calorie intake.
How BMI is Calculated: Metric & Imperial Formulas, WHO Categories & Limitations
A complete clinical and mathematical overview of Quetelet’s Body Mass Index metric and its clinical interpretation.
Realistic Assumptions
- Applies to healthy, non-pregnant adults under standardized WHO biometric screening guidelines.
- Measurements reflect resting physiological conditions with standard calibrated equipment.
Accuracy Note: Accurate to standard floating point precision.
Operational Limitations & Caveats
- Estimates do not account for individual muscle-to-fat ratio, bone density variations, genetics, or pre-existing medical conditions.
- Results are informational and must not replace professional clinical diagnosis, prescription, or medical advice.
Frequently Asked Questions
Related Calculators
Calculate Body Mass Index (BMI) and healthy weight targets (WHO standards). Estimates only, not medical diagnosis.
Calculate Basal Metabolic Rate (Mifflin-St Jeor) and Total Daily Energy Expenditure (TDEE). Estimates only.
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