Calculators

Body Fat Calculator

Body fat percentage (US Navy method).

SexAge (years)Height (cm)Weight (kg)Neck (cm)Waist (cm)

—

Fat mass

—

Lean body mass

—

Ideal body fat (age)

—

Fat to lose

This free body fat calculator estimates your body fat percentage using the US Navy circumference method, which needs only a tape measure. Enter your height, neck and waist (plus hip for women) along with your weight to get your body fat percentage, fat mass, lean body mass, the ideal body fat for your age (Jackson & Pollock), and how much fat you'd need to lose to reach it. Switch between metric and imperial units. Circumference methods are approximate.