Body Fat Calculator (US Navy)
Tape-test estimates from neck, waist, and (for women) hip circumferences plus height. Measure consistently — same tape tension, parallel to the floor, at the specified landmarks.
Inputs
Results
—
Enter measurements
Measuring like the US Navy method
Neck: just below the larynx, tape horizontal. Waist: at the narrowest point, usually near the navel level for the formula. Hip (women): at the widest part of the buttocks.
The estimate uses logarithmic circumference ratios relative to height — practical for field screening but not equivalent to DEXA or hydrostatic weighing. Very lean or very muscular people can sit outside typical ranges.
FAQ
Why is my result unrealistic?
Wrong units, loose tape, or measuring over clothes skew results. Double-check inches vs cm toggles.
Is this for teens?
The Navy method targets adults; teens need different standards.