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There are many different methods to measure BF as Christine mentioned. The underwater method is the most accurate of all but not the most practical since you have to go to a location that offers it. I have been using calipers for 25 years now and even though it has a 3% + or – error it’s the cheapest and most practical (for me at least). I’m sure newer trainers like to use the hand-bio electrical impedance machines, but those are not the most accurate either (especially for the amount of $ you have to spend).