I have used the 3-point, but I know its not accurate for me. I just happen to be more lean in the 3 spots than other spots. I tested out to 8.3% when I know was at least 10%. The 7-pt test is much more accurate.
I attached a bodyfat calculator template I put together that will calculate both the 3-point & 7-point methods. Just type in the measurements & your age, the formulas are already in there.
I have a tanita scale too. It usually says I am between 18%-21%, then the calipers say around 10%. Real accurate. It is total garbage IMO. It uses those stupid bodyfat formulas based on your height & weight. I am 221 at 6ft. I am sure most people with those stats are 20+% bf, thats why it reads that way.
I use an electronic BF analyzer and calipers, and the calipers always measure lower. Looking in the mirror, I do not think either of them are right (for me, anyway). My guess is that the "real" number is somewhere in the middle.
That is correct--and the reason electronic BF measurements should be made each time under the same conditions. As I understand it, the most consistent condition is first thing in the morning after draining your bladder and before drinking anything.
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