Body Fat Calculator
Estimate your body fat percentage using the US Navy circumference method. Accurate, non-invasive, and proven.
Your Results
How It Works
The US Navy Circumference Method is a proven technique for estimating body composition.
Circumference Measurements
Uses neck, waist, and hip measurements to estimate body density, then converts to body fat percentage using validated formulas.
Navy Method Formulas
Different formulas for men and women account for differences in body composition. Men use waist and neck; women add hip measurement.
Category Classification
Results are classified into Essential, Athlete, Fitness, Acceptable, and Obese ranges based on established body fat standards.
Frequently Asked Questions
Common questions about body fat calculation.
The US Navy body fat method estimates body fat percentage using circumference measurements of the neck, waist, and hips. It was developed by the US Navy for body composition assessment and is widely used because it's simple, non-invasive, and reasonably accurate for most people.
The Navy method has an accuracy of about 2-3% compared to hydrostatic weighing or DEXA scans. Results can vary based on measurement technique, hydration levels, and individual body composition. For best accuracy, take measurements first thing in the morning and use consistent technique.
For men, 10-20% body fat is generally considered healthy, with 6-13% being athletic and 14-17% being fit. For women, 18-28% is generally healthy, with 14-20% being athletic and 21-24% being fit. Essential fat is 2-5% for men and 10-13% for women.
Measure neck circumference just below the larynx (Adam's apple). Measure waist circumference at the narrowest point for men or at the navel for women. Measure hip circumference at the widest point (women only). Use a flexible tape measure and keep it parallel to the floor without compressing the skin.
Yes, this calculator supports both imperial (inches, pounds) and metric (cm, kg) units. Simply toggle the unit selector before entering your measurements.