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Here's a rundown of ways to measure body fat, from easiest and most inaccurate to hardest and most precise. Tape measurements of body circumference (e.g. waist, hips) combined with height/weight measurements are unbelievably inaccurate. Just movie reviews for fun, I tested a few movie reviews of the online tape measurement calculators, and got results movie reviews ranging from 12% to 28% body fat. Tape measurements are handy for knowing overall size losses or gains, but are largely useless for knowing body fat. Bioelectrical impedance devices, such as the Tanita body fat scale, determine body fat by sending little electrical pulses through the body. Not bad for average people, usually quite inaccurate for athletic people. Measurements will also vary significantly based on hydration levels. Still a margin of error in the range of +/- 5%, and there's a big difference between 10% and 15%. Skinfold calipers take a pinch of skin at various sites on the body.
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