Body Fat Percentage Calculator

This calculator estimates your body fat percentage using the US Navy circumference method, which only needs a tape measure rather than specialized equipment like calipers or a DEXA scan.

It uses logarithmic formulas based on waist, neck, and (for women) hip measurements relative to height. The log relationships approximate how circumference measurements correlate with body density.

Example: A man with an 85cm waist, 38cm neck, and 175cm height gets a body fat estimate of roughly 16%, which falls in the "Fitness" category.