Katch-McArdle BMR Calculator
Calculate your Basal Metabolic Rate using the Katch-McArdle formula, which accounts for your lean body mass.
The Advantage of Katch-McArdle
Most BMR formulas (like Harris-Benedict or Mifflin-St Jeor) estimate your metabolic rate based entirely on your total body weight. The Katch-McArdle equation is unique because it bases its calculation entirely on your Lean Body Mass (LBM).
Why Lean Mass Matters
Muscle tissue is highly metabolically active compared to fat tissue. Two people can both weigh 200 lbs, but if one has 10% body fat and the other has 30% body fat, the leaner person burns significantly more calories at rest. The Katch-McArdle formula accurately accounts for this.
Worked Example
- Weight: 80 kg
- Body Fat: 15%
- Lean Mass = 80 * (1 - 0.15) = 68 kg
- BMR = 370 + (21.6 * 68) = 1,839 kcal/day.
Frequently Asked Questions
When should I use this formula over others?
You should use Katch-McArdle if you are exceptionally lean (like a bodybuilder) or exceptionally obese, provided you know your true body fat percentage. If you do not know your body fat percentage, use the Mifflin-St Jeor equation instead.
Disclaimer: This calculator is for educational and informational purposes only. It is not a medical diagnosis or professional medical advice. The results provided should not be relied upon as a substitute for professional medical evaluation. Individual health needs vary greatly based on age, medical history, lifestyle, and other factors. Consult a qualified healthcare provider, doctor, or registered dietitian before making any health or medical decisions. If you are experiencing health concerns, seek immediate medical attention.