Determining body fat %

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How do you determine your body fat %?

I don't own any calipers. I input my measurements into the army body fat percentage calculator, and it estimated I have around 25% body fat. I have a tanita digital scale at home that told me this morning I have ~31% body fat. I don't trust it, though. Its numbers are all over the place.

I have a routine physical scheduled in a couple of weeks. Can I ask the doctor to measure my body fat percentage then?

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