Katch-McArdle Lean Body Mass (LBM) BMR / RMR Calculator
Calculate your Basal Metabolic Rate (BMR) based purely on active Lean Body Mass (LBM) and body fat percentage—the most accurate metabolic equation for athletes and muscular lifters.
Calculator Inputs
Live Real-TimeBasal Metabolic Rate (Katch-McArdle BMR)
Active Lean Body Mass (LBM)
69.7 kg
Moderately Active Athlete TDEE
2,908 kcal/day
Detailed Calculation Breakdown
Calculation Methodology
Lean Body Mass (LBM) = Total Weight * [1 - (Body Fat % / 100)]. BMR (Calories/Day) = 370 + (21.6 * LBM in kg).
Important Legal & Educational Disclaimer
Unlike Mifflin-St Jeor or Harris-Benedict, the Katch-McArdle formula measures metabolic expenditure derived strictly from metabolically active lean tissue.
This calculator is designed for educational and informational purposes only based on public statutory frameworks. The outputs do not constitute binding financial, tax, or legal advice. We assume no liability for decisions made based on these estimations. Always verify with the relevant official authorities or a certified professional advisor.
Frequently Asked Questions
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