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Body fat formula
From www.bmicalculator.net
The body fat percentage function on home weight scales are of suspect accuracy. They work on resistance to electricity flowing through the body from one of the metal pads to the other. If like me you don't wear shoes much, the skin on your foot will be thicker. The following method will probably give a better figure.
The best time to use this formula is in the morning. Your body weight and waist measurements are the most accurate just after you wake up from 78 hours of sleep
The formula below will not calculate your exact body fat percentage. The most accurate way is underwater weighing, but this formula should give you a consistent measurement you can use as a guideline so you can determine if you're losing body fat and/or muscle.
Body Fat Formula For Women 


Factor 1 
(Total body weight x 0.732) + 8.987 
Factor 2 
Wrist measurement (at fullest point) / 3.140 
Factor 3 
Waist measurement (at navel) x 0.157 
Factor 4 
Hip measurement (at fullest point) x 0.249 
Factor 5 
Forearm measurement (at fullest point) x 0.434 
Lean Body Mass 
Factor 1 + Factor 2  Factor 3  Factor 4 + Factor 5 
Body Fat Weight 
Total bodyweight  Lean Body Mass 
Body Fat % 
(Body Fat Weight x 100) / total bodyweight 


Body Fat Formula For Men 

Factor 1 
(Total body weight x 1.082) + 94.42 
Factor 2 
Waist measurement x 4.15 
Lean Body Mass 
Factor 1  Factor 2 
Body Fat Weight 
Total bodyweight  Lean Body Mass 
Body Fat % 
(Body Fat Weight x 100) / total bodyweight 
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(C) Peter Scott 2015
Last edit 15 April 2017