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Katch McArdle Calculator

Writer's picture: Dennis RomatzDennis Romatz

Updated: Jan 13

Hi there! I'm Dennis Romatz, personal trainer at Dennis Romatz in Chicago.

In this blog post, I'll provide a detailed look at the Katch McCardle calculator.


The Katch-McArdle equation is a method used to estimate an individual's Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE). BMR represents the number of calories your body needs to maintain basic physiological functions while at rest, such as breathing, circulating blood, and regulating body temperature.


TDEE, on the other hand, takes into account your BMR as well as your level of physical activity throughout the day.


Katch McArdle Calculator
Katch McArdle Calculator

What sets the Katch-McArdle equation apart from other BMR formulas is that it considers an individual's lean body mass (LBM) rather than just body weight. This makes it particularly useful for people who have a higher proportion of muscle mass, such as athletes or those who engage in regular strength training.



The equation itself is relatively simple:


BMR = 370 + (21.6 * Lean Body Mass in kg)

Once you have calculated your BMR using this equation, you can then determine your TDEE by multiplying your BMR by an activity factor that reflects your typical level of physical activity.


This activity factor takes into account everything from sedentary lifestyle to intense exercise.


Using the Katch-McArdle calculator can provide a more accurate estimate of your calorie needs compared to other methods, especially if you have a higher muscle mass or engage in regular strength training.


By accounting for lean body mass, it provides a more personalized approach to determining your daily energy requirements.


About the Author:

Dennis Romatz is a nutrition coach, and certified personal trainer in Chicago in the downtown Chicago Lakeshore East neighborhood providing personal training scheduled at your convenience at apartment & condo gyms, and in-home. Tailored training programs are designed to meet your individual needs & goals and guaranteed to get you in the best shape of your life in 3 months or less or your money back. Dennis has been recognized as "one of the 20 best personal trainers in the world" by The Institute of Personal Trainers. You can contact Dennis to train with him in person or live online or connect with him on Facebook, Twitter, LinkedIn and Instagram.

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