How accurate is the US Navy Method?

It is a reliable estimation within 3-4% of DEXA scans, provided measurements are taken accurately.

Free Body Fat Calculator Online

Estimate body fat percentage using the US Navy Circumference Method client-side.

🔒 100% SECURE SANDBOX LOCAL COMPUTING: Data is processed inside memory frames on your machine. Zero network requests made.

Configure Inputs

Gender

Height (cm)

Neck Circumference (cm)

Waist Circumference (cm)

Hip Circumference (cm - Females Only)

Calculated Outputs

Estimated Body Fat (%)0

Fitness Category0

Quick AI Answer & Insights

Summary: Determines physical fat parameters offline using US Navy calculations.

Quick Answer: Estimate body fat composition using neck and waist circumference indexes.

Key Takeaways:

Different inputs for men/women.

Common Mistakes:

Measuring waist at the wrong vertical coordinate (not navel level).

Related Calculators

BMI →Calories →

Quick AI Answer

Determines physical fat parameters offline using US Navy calculations.... Runs locally in your browser sandbox using secure script computations. Whiteboard security parameters apply.

Privacy Status100% PRIVATE

Last UpdatedJune 30, 2026

What is a Free Body Fat Calculator Online Utility?

Determines physical fat parameters offline using US Navy calculations.

Step-by-Step Instructions to use Body Fat Calculator

Configure your target Gender (defaults: male).
Configure your target Height (cm) (defaults: 175).
Configure your target Neck Circumference (cm) (defaults: 38).
Configure your target Waist Circumference (cm) (defaults: 82).
Configure your target Hip Circumference (cm - Females Only) (defaults: 90).

Why Local Browser Processing is Secure

Calculating parameters takes place strictly inside your local browser tab. No numbers are logged.

Key Takeaways

100% private: Processing runs entirely in browser memory buffers.
Zero upload latency: Instant local generation without network queue delay.
Safe and secure: No files, metrics, or personal inputs are logged on any server.

Common Mistakes

Uploading highly confidential documents to server-based formatting sites.
Forgetting to check the file size outputs (ensure you keep local backups).
Assuming online tools are inherently private without checking their code structures.