How to Use This Calculator
Pick your method, enter your measurements, and your body fat percentage, category, fat mass, and lean mass update instantly. For the full step-by-step walkthrough — including exactly where and how to take each measurement, and how the underlying formulas work — see the "How to Use the Body Fat Calculator" section of our complete guide.
Read the full guide first for the most accurate results: how the US Navy formula was derived, how Jackson-Pollock skinfold testing works, why body fat category ranges differ between men and women, and a detailed worked example for every calculation on this page are all covered in our Body Fat Percentage Calculator Guide 2026 →
This calculator provides general estimates for informational and educational purposes only. It is not medical advice and does not diagnose any medical condition. Tape-measurement and skinfold methods are estimates and can vary with measurer technique, hydration status, and individual body shape. Always consult a doctor or qualified professional for a clinical body composition assessment.