This body fat calculator estimates your body fat percentage using the US Navy circumference (tape) method, from your height and body measurements. Enter the values above.
Formula (US Navy, men, inches)
%BF = 86.010 × log₁₀(waist − neck) − 70.041 × log₁₀(height) + 36.76
Women use hip measurement too. This method estimates fat from body proportions, not direct measurement.
Example
Man, waist 34″, neck 16″, height 70″: %BF ≈ 15.5%.
Body fat ranges (men)
Athletes 6-13% Fitness 14-17% Average 18-24% High 25%+
Important
This tool is for general educational purposes only and is not medical advice, diagnosis, or treatment. It does not replace evaluation by a qualified healthcare professional — consult one for any health decision. Last updated: August 2026.
Frequently Asked Questions
How do I measure body fat at home?
The US Navy tape method estimates it from neck, waist (and hip for women) and height. It is quick but an estimate, not a precise measurement.
What is a healthy body fat percentage?
Roughly 10-20% for men and 18-28% for women, varying with age and fitness. A professional can assess your situation.
Is the tape method accurate?
It is a reasonable estimate for most people but less accurate than DEXA or hydrostatic weighing.