US Navy Formula
Fast, tape-measure based assessment. Accuracy varies based on muscle mass.
Estimated Body Fat
The Mathematics (Metric)
Male:495 / (1.0324 - 0.19077 * log10(Waist - Neck) + 0.15456 * log10(Height)) - 450
Female:
495 / (1.29579 - 0.35004 * log10(Waist + Hip - Neck) + 0.22100 * log10(Height)) - 450