Body Fat Calculator
US Navy body fat % from neck, waist, hip and height.
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About this calculator
Tape-based estimate; accurate within ~3–4% vs lab methods when measurements are taken correctly (snug, not sucked in).
Formula
Navy: BF% = f(log10(waist±hip−neck), log10(height)) with sex-specific constants.
Health metrics are informational estimates and are not a medical diagnosis.
Frequently Asked Questions
Where to measure waist?
At the narrowest point, usually just above the navel, relaxed breathing, tape horizontal.