What is the difference between BMR and TDEE?
BMR is your baseline resting energy burn with zero activity. TDEE (Total Daily Energy Expenditure) multiplies BMR by your daily physical activity level.
BMR Calculator
Basal Metabolic Rate (BMR) measures the minimum energy your body requires to maintain vital physiological processes (breathing, circulation, organ function) at complete physical and digestive rest.
Scientific Formula & Exercise Physiology Standards
Equation: Mifflin-St Jeor & Harris-Benedict Equations | Peer-Reviewed Source: American Journal of Clinical Nutrition (1990)
Men: (10×W) + (6.25×H) - (5×A) + 5 | Women: (10×W) + (6.25×H) - (5×A) - 161
Where W is weight in kg, H is height in cm, and A is age in years. For those with known body composition, Katch-McArdle uses lean mass: BMR = 370 + (21.6 × Lean Body Mass kg).
Step-by-Step Worked Example: Mifflin-St Jeor BMR Example
- Weight component: 10 × 80 = 800
- Height component: 6.25 × 180 = 1125
- Age component: 5 × 30 = 150
- Sum + Gender Constant: 800 + 1125 - 150 + 5 = 1780 kcal
Calculation Result: BMR = 1,780 kcal/day (Baseline energy expenditure before physical activity)
Clinical Nuances, Limitations & Best Practices
- Does not account for hormonal imbalances (e.g. thyroid conditions).
- Extreme ambient temperatures or illness can alter baseline energy output.
Frequently Asked Questions (BMR Calculator)
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