What are some of the best body fat calculations used this days?
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nothing is going to be absolutely accurate and with any calipers (and I like the Skyndex that was mentioned) it is dependent on your experience and consistency doing it. DEXA is good because you can get bone density as well, Hydrostatic weighing has been and still is the gold standart, bodpod is pretty accurate but might be hard to find one.
Nothing wrong with a tape measure and watching the inches get smaller. I have learned through experience that body fat % is less important that losing inches and for obese clients can be a negative experience.