Body Fat Calculator Guide

Quick Answer

Quick Answer: Enter height, neck, waist (and hip for women) in centimeters in our Body Fat Calculator for a US Navy method body fat estimate.

Why this matters

BMI alone does not distinguish muscle from fat; circumference formulas add another data point for fitness tracking.

Step by step

1. Open the Body Fat Calculator.
2. Select sex and enter metric measurements.
3. Read the estimated percentage and medical disclaimer.

Tips

• Compare with BMI Calculator and Ideal Weight.
• Measure consistently—same time of day, relaxed stomach.

Try It Yourself

Open the Body Fat Calculator →

Frequently Asked Questions

Is this a medical test?

No. It is an estimate for education only—not a diagnosis.

Why is hip required for women?

The Navy formula uses hip circumference in the female equation.

Are measurements uploaded?

No. Math runs locally in your browser.