METHODCalculation, assumptions and sources
Formula used
US Navy circumference equations using log₁₀ of height, neck, waist and hip
What is included
Estimate body-fat percentage with a circumference method and show fat mass and lean mass separately.
Assumptions and limits
Results are population-based estimates. Body composition, training status and individual health are not fully captured.
Reference sources
CDC BMI guidance · U.S. Navy Physical Readiness Program
Last reviewed: September 2026Body Fat Calculator
Estimate body-fat percentage with a circumference method and show fat mass and lean mass separately.
Enter the required values or content, adjust the options and then review the detailed result.
No. The result is an estimate only and is not medical advice or a diagnosis.
FAQFrequently asked questions
What can I do with Body Fat Calculator?
Estimate body-fat percentage with a circumference method and show fat mass and lean mass separately.
How do I use Body Fat Calculator?
Enter the required values or content, adjust the options and then review the detailed result.
Are my data uploaded?
No. Inputs and files for this tool are processed locally in your browser.
Does the result replace professional advice?
No. The result is an estimate only and is not medical advice or a diagnosis.
Is this tool free?
Yes. Every feature is free and requires no registration.
Does it work on mobile?
Yes. The interface is optimized for iPhone, Android, tablets and desktop computers.