Body Fat Calculator
Understand your body composition and track your fitness progress with our interactive modeling tool.
US Navy Method: Neck & Waist required
Estimated Composition
16.1%
Body Fat Percentage
Fat Mass
12.1 kg
Lean Mass
62.9 kg
Mass Component Analysis
84%
LEAN
12.1 kg non-lean mass detected
Measuring Tips
Measure Neck below the larynx, and Waist at the horizontal level of the navel for men (at the narrowest point for women).
Healthy Ranges
Essential fat is 2-5% for men and 10-13% for women. Fitness levels are typically 14-17% (men) and 21-24% (women).
Composition Modeling Lab
- Select your Gender and enter your Weight and Height.
- Measure your Neck, Waist, and Hips (for women) using a flexible tape measure.
- Enter the measurements in centimeters (cm).
- Observe the Mass Component Analysis donut chart showing your Fat vs Lean ratio.
- View your Body Fat Percentage, Fat Mass, and Lean Mass results.
- Click Copy Composition Report to save the data for your fitness journey tracking.
WHO Recommended Parameters
Maintaining healthy body fat limits directly correlates with minimizing WHO obesity-related risks and ensuring optimal long-term physiological health.
Frequently Asked Questions
What is the US Navy Body Fat Method?
The US Navy method is a formula that uses circumference measurements (Neck, Waist, and Hips for women) along with height to estimate body fat percentage. While not as accurate as DXA scans, it is a reliable and accessible screening tool.
Where should I take the measurements?
For men, measure the neck below the larynx and the waist at the level of the navel. For women, measure the neck, the waist at the narrowest point, and the hips at the widest point. Ensure the tape is level and snug but not compressing the skin.
What is a healthy body fat percentage?
Healthy ranges vary by age and gender. For men, fitness levels are typically 14-17% and acceptable up to 24%. For women, fitness levels are 21-24% and acceptable up to 31%.
What is Lean Body Mass?
Lean Body Mass (LBM) is the amount of weight you carry overall that isn't fat. This includes muscles, bones, organs, and water. Tracking LBM is essential for monitoring muscle gain during strength training.
Athletic Lab Benefits
- Instant Body Fat and Lean Mass algorithms
- Interactive body composition donut analysis preview
- Integrated US Navy precision engine for non-invasive testing
- Supports gender-specific measurement adjustments
- 100% private — your body data stays local
- Mobile-optimized for checking progress at the gym
Privacy-First Architecture
100% Local Processing
Unlike traditional online tools, Body Fat Calculator processes your data entirely within your browser. Your files, numbers, and private info never reach our servers, ensuring absolute confidentiality.
Lightning Fast Speed
By eliminating the need for server uploads and downloads, we provide near-instant results. This technical approach saves bandwidth and provides a seamless user experience on both mobile and desktop.
Professional Grade Utility
The Body Fat Calculator is part of the Toolkits Plus suite—a comprehensive collection of professional-grade utilities designed for modern digital workflows. Whether you're a student, professional, or hobbyist, our tools provide accurate, verified results without the clutter of traditional "thin" web applications.