Body Fat Percentage Calculator
A better health metric than the scale alone.
Body Fat Percentage Calculator
U.S. Navy tape method using waist, neck, hip (females), and height
Calculated instantly
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What This Calculator Does
The Body Fat Percentage Calculator estimates body composition using the U.S. Navy tape method, which needs only waist, neck, height, and hip measurements. It gives a more meaningful health picture than weight alone.
How It Works
The Navy method uses logarithms of circumference measurements. Men rely on waist, neck, and height; women add the hip. The result estimates the percentage of body mass that is fat to within a few points of lab methods.
Example
A male with an 82 cm waist, 37 cm neck, and 175 cm height gets a body-fat estimate near 18%, a healthy athletic range.
Formula
%BF = 86.01 × log10(waist − neck) − 70.041 × log10(height) + 36.76%BF = 163.205 × log10(waist + hip − neck) − 97.684 × log10(height) − 78.387Reading the Results
Body Fat Percentage
The estimated share of your body mass that is fat, derived from the U.S. Navy circumference method.
Frequently Asked Questions
How accurate is the Navy method?
Published studies show it agrees with more advanced methods like DEXA within roughly 3-4 percentage points when measured carefully.
What is a healthy body fat percentage?
Athletes often sit at 6-13% (men) and 14-20% (women). Healthy general ranges are about 14-24% for men and 21-35% for women.
How do I take the measurements?
Wrap a tape measure around the bare waist at the navel, the neck below the larynx, and the widest part of the hips, keeping it level and snug.