The Navy Method Explained
The US Navy Method is widely considered one of the most accurate ways to estimate body fat percentage without using expensive equipment like DEXA scans or hydrostatic weighing. It relies on a few simple circumference measurements (Neck, Waist, and Hips for women) to calculate body density.
Why Body Fat Matters More Than BMI
While BMI just looks at your weight relative to your height, Body Fat Percentage tells you what that weight is composed of. Two people can weigh 200 lbs, but one might be 30% body fat (obese) while the other is 10% body fat (muscular athlete).
Body Fat Categories Explained
- Essential Fat: The bare minimum fat required for physical and physiological health. Dipping below this is dangerous.
- Athletes: Highly muscular and lean physiques.
- Fitness: A healthy, lean look without being "shredded." Sustainable for most active people.
- Average: A normal body composition with some visible body fat.
Frequently Asked Questions
How accurate is this calculator? ▼
The Navy Method is generally accurate within 3-4% for most people. However, hydration levels, food intake, and measuring errors can affect the result. For best results, measure yourself first thing in the morning.
Why do I need to measure my neck? ▼
The neck is a key indicator of upper body lean mass vs. fat storage. A thicker neck (relative to height) often correlates with higher muscle mass, which helps the formula distinguish between "big and muscular" vs "big and overweight."