Body Fat Calculator - Free Online Tool | PivaBox

Estimate body fat percentage using the U.S. Navy circumference method

How to Use Body Fat Calculator

  1. Select your gender
  2. Enter your height, weight, neck, and waist measurements (plus hip for women)
  3. Click Calculate to see your estimated body fat percentage, fat mass, and lean mass

Frequently Asked Questions

How accurate is the U.S. Navy body fat method?

The U.S. Navy circumference method is generally accurate within 3-4% of DEXA scan results for most people. It is widely used by military organizations worldwide for fitness assessments.

What is a healthy body fat percentage?

Healthy body fat ranges vary by age and gender. For men, 10-20% is generally considered healthy; for women, 18-28%. Athletes typically have lower percentages.

Why does the formula differ for men and women?

Women naturally have higher essential body fat for reproductive health. The Navy method accounts for this by including hip measurement and using gender-specific formulas based on large population studies.