Katch-McArdle Calculator

Created by Mateusz Mucha
Reviewed by Bogna Szyk and Jack Bowater
Last updated: Jan 28, 2022

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

You can also check out the maintenance calorie calculator to calculate how many calories your body needs to maintain your current weight.

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
Weight
lb
Height
ft
in
Sex
Male
Lean Body Mass
lb
Basal Metabolic Rate
kcal/
per day
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