Body Fat Calculator

About Body Fat Calculator

The Body Fat Calculator estimates your body fat percentage using scientifically validated formulas. The U.S. Navy method uses circumference measurements and is considered one of the most accurate field methods. The BMI method provides a simpler alternative based on height and weight. Body fat percentage is a better health indicator than weight alone, as it distinguishes between fat mass and lean mass (muscle, bone, organs).

Features

• Two calculation methods: U.S. Navy and BMI-based
• Support for both metric and imperial units
• Gender-specific formulas and categories
• Visual category indicator with color coding
• Body fat mass and lean mass estimates
• Reference chart for healthy body fat ranges

Frequently Asked Questions

What is a healthy body fat percentage?

For men, a healthy range is typically 10-20%. For women, it is 20-30%. Essential fat levels are 2-5% for men and 10-13% for women — going below these levels can be dangerous. Athletes may have lower percentages due to higher muscle mass.

How accurate is the Navy method?

The U.S. Navy method has an accuracy of about ±3% when measurements are taken correctly. For best results, measure at the same time of day, use a flexible tape measure, and have someone assist you. It is more accurate than BMI for athletic individuals.

Why do women have higher body fat percentages?

Women naturally carry more essential fat for biological functions including hormone regulation and childbearing. Essential fat for women is 10-13% versus 2-5% for men. This is why healthy body fat ranges are higher for women across all categories.

Can I use this for children or teens?

These formulas are designed for adults (18+). Children and teenagers have different body composition norms. For minors, consult a pediatrician for proper body composition assessment.