calculate target waist size from target bodyfat (and height & neck)

Gender Male
Units Inches
Waist (men) / waist + hip (women)
Target Bodyfat % (optional)

This will generate a table of bodyfat percentages and your corresponding abdomen measurements for men, or waist + hip sizes for women, with corresponding descriptions from this table from the American Council on Exercise:

Description Women Men
Essential fat 10-13% 2-5%
Athletes 14-20% 6-13%
Fitness 21-24% 14-17%
Average 25-31% 18-24%
Obese 32%+ 25%+

The output is calculated using the U.S. Military bodyfat formulas (DoD Instruction 1308.3, 2002).

Neck measurements are assumed constant. If this assumption distresses you, enter your neck measurement as 0, and the resutls for men will be abdomen - neck, and for women will be waist + hip - neck.

The creators of these formulas only use them for male bodyfat percentages from 9% to 37%, and female bodyfat percentages from 19% to 47%. These may be reasonable ranges within to expect some semblance of accuracy.

How to measure males.
How to measure females.

The hard part of the math was done by Bill Jonas.
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