The US Army method measures body fat via neck, waist, and hip measurements.
More accurate than BMI for people with significant muscle mass.
Use this calculator as a starting point for any health or fitness goal that requires a numeric benchmark. The result is an estimate, not a diagnosis — but it provides a concrete figure to track against over time.
The most common mistake is treating the result as a precise measurement rather than an evidence-based estimate. All body metric calculators have margins of error — use the result as a tracking baseline, not a clinical diagnosis.
Someone returning from a period of inactivity uses the calculator to establish a baseline health metric before starting a new training programme. Monthly recalculations with consistent measurement conditions create a trackable trend that scale weight alone cannot provide.
Margin of error ~3-4%, comparable to hydrostatic weighing.
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