Body Fat Calculator

Estimate your body fat percentage using the Navy or BMI method

Measurements

Unit System

Method

Gender

Height (cm)

Neck circumference (cm)

Abdomen / Waist circumference (cm)

Weight (kg) (optional, for fat/lean mass)

Results

Enter your measurements and click Calculate

About the Formulas

U.S. Navy Method uses circumference measurements to estimate body density. Male formula: 86.010 × log₁₀(abdomen − neck) − 70.041 × log₁₀(height) + 36.76. Female formula: 163.205 × log₁₀(waist + hip − neck) − 97.684 × log₁₀(height) − 78.387.

BMI Method (Deurenberg) estimates body fat from BMI and age. Less accurate for athletes but requires only standard measurements.

All measurements should be taken in the morning. Take multiple measurements and average them for best results.