How accurate is the Navy method?

It's within 3-4% of laboratory methods for most people. It's more accurate than BMI alone, but less accurate than DEXA scans or hydrostatic weighing.

What is a healthy body fat percentage?

For men: 10-20% is healthy, with 15% being average. For women: 18-28% is healthy, with 23% being average. Athletes typically have lower percentages.

Why do women have higher body fat percentages?

Women biologically require more essential fat for hormonal function and potential pregnancy. This sex-specific fat is stored in breasts, hips, and thighs.

What is the average percentage of body fat?

In the USA, the average body fat percentage between 1999-2004 for a woman aged 16-19 was 35%, for those 20-39 it was 38%, and for those 40-59 it was 41%. For men between 16-19 it was 23%, between 20-39 it was 26% and between 40-59 it was 28%.

How does the body burn fat?

When you need to use your stored fat for energy, your body begins releasing fatty acids into the blood. Here they are transported around the body to the muscles in need. Once in the muscles, they are broken down, releasing energy and CO2. The CO2 then leaves the body through the lungs or urine.

What does fat do for your body?

Fats are an essential part of our diet; they provide us with energy, are used in cell growth, and are made into essential hormones. Fatty tissues protect our organs from physical damage, and provide us with insulation. Too many fatty tissues will act as new pathways for diseases to form.

Body Fat Percentage Calculator

Calculate your body fat percentage using the U.S. Navy method. Enter your measurements to get an accurate estimate of your body composition.

Complete User Guide

Our Body Fat Calculator uses the U.S. Navy method. Here's how to use it:

Step 1: Select your biological sex.

Step 2: Enter your height in cm or feet/inches.

Step 3: Measure and enter your neck circumference (at the narrowest point).

Step 4: Measure and enter your waist circumference (at navel level for men, at the narrowest point for women).

Step 5: Women: Also measure hip circumference (at the widest point).

Step 6: Click 'Calculate' to see your estimated body fat percentage and fitness category.

The Mathematical Formula

Men: 495 / (1.0324 - 0.19077 × log10(waist - neck) + 0.15456 × log10(height)) - 450

The U.S. Navy method uses circumference measurements:

For men: Body Fat % = 86.010 × log10(waist - neck) - 70.041 × log10(height) + 36.76

For women: Body Fat % = 163.205 × log10(waist + hip - neck) - 97.684 × log10(height) - 78.387

Body fat categories: - Essential: 2-5% (men), 10-13% (women) - Athletes: 6-13% (men), 14-20% (women) - Fitness: 14-17% (men), 21-24% (women) - Average: 18-24% (men), 25-31% (women)

About Body Fat Percentage Calculator

Body fat percentage is a measure of your total body composition. It represents the proportion of your body weight that comes from fat, including both essential fat (needed for bodily functions) and storage fat (energy reserves).

Unlike BMI which only considers height and weight, body fat percentage provides a more accurate assessment of body composition and health risks. It helps determine fitness levels, track progress during weight loss or muscle gain programs, and assess overall health status.

Why Measure Body Fat? • Health Assessment: Better indicator of health risks than BMI alone • Fitness Tracking: Monitor changes in body composition during training • Goal Setting: Set realistic targets for fat loss or muscle gain • Performance: Optimize body composition for athletic performance

Calculation Methods ADA Method — Most commonly used. Uses age, BMI, and gender with a validated formula. Navy Method — Most accurate. Requires neck, waist, and hip measurements. BMI Method — Simplest. Basic BMI-based estimation.

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