Units
Sex

Just below the voice box

Men: at the navel. Women: narrowest point

Estimated body fat (U.S. Navy method)

17.5%

Male, 35 years · fat mass 31.5 lb, lean mass 148.5 lb

Fat mass
31.5 lb
Lean mass (everything else)
148.5 lb
BMI
25.8
BMI-based estimate (Deurenberg)
22.8%

The BMI-based estimate is 5.3 points higher than the tape measure estimate. BMI cannot tell muscle from fat and each method has its own error, so the two often disagree; neither number is a precise measurement.

How it was calculated

Height
70 in
Waist − neck
19 in
Formula (inches)
86.010 × log10(19) − 70.041 × log10(70) + 36.76

Body Fat Calculator by SureCalcs