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Formulas and reference sources

The sources and formulas for estimating some evaluation values ​​are listed below.
IMPORTANT remember that these values, despite being widely spread, represent an estimate and can
therefore be affected by errors.

Body mass index (BMI or BMI)
The BMI allows the diagnosis of overweight and obesity, but does not give information on the distribution, nor on the exact quantity of body fat (a bodybuilder may have a very high BMI despite not being obese; an elderly person with low muscle mass may have excess body fat despite having a BMI within the normal range). The Body Mass Index (BMI, kg/m2) is calculated: by dividing the weight, expressed in kg by the square of the height, expressed in metres, as an indirect index of adiposity.

Source: Diagnosis - Overweight and obesity ( salute.gov.it)

Protein needs
The optimal daily protein requirement depends on several factors: your weight, your fitness goal (weight maintenance, muscle gain or fat loss), your activity level physical and, in the case of a woman, whether she is pregnant or not. This ranges from 1.2-1.8g/kg if you are sedentary up to 3.3g/kg if you are trying to minimize fat gain. Our protein calculator estimates the daily amount of dietary protein adults need to stay healthy.

1) Link: NIH, What are proteins and what do they do?
2) Link: Optimal Protein Intake Guide

Fat mass calculation
Formulas used
Woman: p = 495/(1.29579-0.35004*Math.log10(waist+hips-neck)+0.221*(Math.log10(height)))-450
p = 495/(1.0324-0.19077*Math.log10(waist-neck)+0.15456*(Math.log10(height)))-450
Wilmore and Behnke formula - An anthropometric estimation of body density and lean body weight in young women - https://academic.oup.com/ajcn/article-abstract/23/3/267/4716658?login= false
Link: Anthropometric Estimation of Body Density and Lean Body Weight in Young Women | The American Journal of Clinical Nutrition | Oxford Academic (oup.com)

Ideal Weight Calculation
Lorenz formula
Ideal weight Men = height in cm - 100 - (height in cm - 150)/4
Ideal weight Women = height in cm - 100 - (height in cm - 150)/2

Keys formula
Ideal weight Men = (height in m)² x 22.1
Ideal weight Women = (height in m)² x 20.6