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RFM Calculation
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The RFM Calculation is a good technique to measure the body fat. It would be great to have it in wger as well. It is an easy calculation for Men: 64 – (20 x height/waist circumference) = RFM Women: 76 – (20 x height/waist circumference) = RFM
Since its measures the height to waist ratio it does not matter if it is a metric unit or another one.
Wikipedia has a good table for the interpretation of the RFM result. https://en.wikipedia.org/wiki/Body_fat_percentage#Typical_body_fat_amounts