How to measure BF%

You can't. You need a set of body fat calipers, and someone to take the measurements on you. Most decent gyms can do this for you, sometimes free, sometimes a very nominal fee.
 
there are some sites online where you put in some of your stats and its spits out a number. dont know any offhand but a google might provide some

be aware that its said that calipers have a margin of error of plus or minus 2%. so these sites will probably be greater than that.
 
true, there are ways to get a good estimate of your body fat % by going off of measurements. but those with larger skeletal frames will show up as a higher %, basically the same problems faced by BMI calculations.
Still, it'd be a reasonable estimate...so you'd know if you were in the upper teens, or lower, etc...

Calipers aren't perfect, but are better than those bio-impedience meters, a.k.a. the Tanita brand scales. And of course, the underwater body fat test is supreme, but I heard it costs $1,000 for normal people (non-olympic athletes) to get tested, and it's not a real common testing device, so good luck finding one.
 
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