Basal Metabolic Rate (BMR) Calculator
Compute your exact resting energy expenditure across multiple clinical formulas (Mifflin-St Jeor, Revised Harris-Benedict, and Katch-McArdle)
Required for Katch-McArdle
Consensus Basal Metabolic Rate (BMR)
1,712 kcal / day
Mifflin-St Jeor Standard: 1,712 kcal
Minimum calories required to sustain vital organ function at rest
Mifflin-St Jeor (1990)
1,712 kcal
Clinical gold standard equation
Revised Harris-Benedict
1,741 kcal
Updated regression model
Katch-McArdle (LBM)
1,768 kcal
Accounts for lean muscle mass
Hourly Resting Burn
71.3 kcal/hr
Caloric burn rate per hour
Scaling BMR to Total Daily Energy Expenditure (TDEE)
Activity Level
Multiplier
Estimated Daily Calorie Burn
Metabolic Baseline Insight
BMR represents roughly 60% to 75% of total daily energy expenditure for most individuals, with the remainder consumed by physical activity, digestion, and NEAT.
Scientific Formula Reference Guide
Formula Name
Variables Used
Clinical Application
Mifflin-St JeorWeight, Height, Age, SexModern medical standard across broad demographics
Revised Harris-BenedictWeight, Height, Age, SexWidely utilized traditional regression equation
Katch-McArdleLean Body Mass (LBM)Ideal for individuals with known body fat percentages
Accuracy Note
While formulas provide exceptional baseline estimates, individual metabolic rates can vary by ±10% due to genetics, hormonal profiles, and thyroid function.