Katch-McArdle Calculator

By Mateusz Mucha
Last updated: May 15, 2020

This Katch-McArdle calculator is another tool that can help you keep healthy and fit. The Katch-McArdle formula allows you to calculate your Basal Metabolic Rate, (BMR), which is the minimum amount of calories your body needs per day to keep functioning, assuming you were to do no exercise for that day. This equation differs from the Harris-Benedict equation because it takes into account lean body mass.

What is the Katch-McArdle calculator?

Katch-McArdle calculator is a quick and easy tool that enables you to calculate your BMR. A basal metabolic rate is the amount of energy used by an individual at rest over a 24 hour day.

If you interested in other formulas calculating BMR, you may also want to check out the Mifflin St Jeor equation.

What is the Katch-McArdle formula?

To apply the Katch-McArdle formula you need to know your Lean Body Mass:

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

It is also possible to calculate your BMR using this formula if you know:

  1. Your body fat percentage, because then lean body mass can be calculated as following:

LBM = (Weight[kg] * (100 - Body Fat %)/100

  1. Your weight and height to estimate your lean body mass using Boer formula (already built into this calculator):

LBM (men) = 0.407 * weight [kg] + 0.267 * height [cm] - 19.2

LBM (women) = 0.252 * weight [kg] + 0.473 * height [cm] - 48.3

Choose your calculation method depending on the values you know and answer the first question Do you know your lean body mass? at the top of this calculator.

Mateusz Mucha
Do you know your lean body mass?
I don't know my LBM
Lean Body Mass
Basal Metabolic Rate
per day
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