Body Fat Calculator

How the Body Fat Calculator Works

This calculator estimates your body fat percentage using the U.S. Navy Body Fat Formula. It is one of the most widely used and reliable circumference‑based methods for estimating body composition without specialized equipment.

Formulas Used (U.S. Navy Method)

The calculator uses different formulas for men and women:

• Male: Body Fat % = 86.010 × log10(waist − neck) − 70.041 × log10(height) + 36.76
• Female: Body Fat % = 163.205 × log10(waist + hip − neck) − 97.684 × log10(height) − 78.387

Example

Example for a male: height 180 cm, neck 40 cm, waist 85 cm:

Body Fat % = 86.010 × log10(85 − 40)
           − 70.041 × log10(180)
           + 36.76

           ≈ 17.2%