bodyfat calculator

bfc.sh

#!/bin/bash

height=$1
neck=$2
abdomen=$3

if [[ -z $height || -z $neck || -z $abdomen ]]; then
    echo "$0 - calculate your bodyfat using the US Navy method"
    echo "Usage: $0 <height> <neck> <abdomen>"
    echo " height  - height (in inches)"
    echo " neck    - neck diameter (in inches, just above adam's apple)"
    echo " waist   - waist diameter (in inches, narrowest point)"
    exit 1
fi

bodyfat=$(echo "86.010 * (l($abdomen - $neck)/l(10)) - 70.041 * (l($height)/l(10)) + 36.76" | bc -l)
printf "bodyfat: %0.0f%%" $bodyfat

Hmm... Interesting, do they take the average of the three measurements or the average body fat calculation that results from the 3 sets of measurements? Ie they only calculate your bf once vs calculating your bf 3 times.

…

On Thu, Aug 5, 2021, 11:53 PM prewdigy ***@***.***> wrote: ***@***.**** commented on this gist. ------------------------------ I am assuming they measure your neck and abdomen more than once to get an average. why not have it do those calculations as well for you. I think they round to the nearest 1/4" and use three measurements. or at least that is how the army does it. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <https://gist.github.com/7ae8fae988b04ed6bcae1c66287c2944#gistcomment-3848434>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAAJHV6YFR35TDCM624LNZDT3OBGHANCNFSM5BVJYPRQ> . Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&utm_campaign=notification-email> .

they take the average of the set of measurements then use that to calculate it. and they measure your neck, then you stomach, then you neck and so forth.

also considering how much you normally work out. i wouldn't put a lot of faith in it for giving you a decent level of exactness.