🔥 Body Fat Calculator

U.S. Navy method. Uses neck, waist, and hip measurements. All data stays local.

Gender

Height (cm)

Neck (cm)

Waist (cm)

Hip (cm)

Age

Body Fat %

The U.S. Navy method estimates body fat percentage using circumference measurements. It's surprisingly accurate compared to hydrostatic weighing.

For men: 495 / (1.0324 - 0.19077*log10(waist-neck) + 0.15456*log10(height)) - 450

For women: 495 / (1.29579 - 0.35004*log10(waist+hip-neck) + 0.22100*log10(height)) - 450

Measure at the same time of day, ideally in the morning. Consistency matters more than absolute accuracy.