About the Body Fat Calculator
The Body Fat Calculator is designed to give you a quick, practical estimate using the information you enter. Estimate body-fat percentage from circumference measurements using the U.S. Navy method. The tool supports the unit choices shown in the calculator and presents the result in a format that is easy to compare with related weight-management measures.
Use the calculator by entering the requested values and selecting Calculate. The result card explains the main estimate and, where useful, shows supporting values that help you understand how the answer was derived. Select Reset to clear the form and start again.
This calculator is intended for general educational and planning purposes. It uses published equations or standard mathematical relationships, but individual needs and outcomes can vary. Treat the result as an estimate rather than a diagnosis, prescription, or guarantee.
Estimate body-fat percentage from circumference measurements using the U.S. Navy method.
What Is Body Fat Percentage?
Body-fat percentage estimates the proportion of total body weight made up of fat mass. Circumference-based methods offer a convenient estimate without specialized equipment.
This calculator uses the U.S. Navy circumference method and, when weight is supplied, also estimates fat mass and fat-free mass.
Formula / Method Used
Uses sex-specific logarithmic equations based on height and neck/waist measurements; the female equation also uses hip circumference.
How to Use the Body Fat Calculator
- Choose the unit system or options requested by the tool.
- Enter the required measurements or planning values.
- Select Calculate to view your result and supporting details.
- Review the explanation and limitations before using the estimate for planning.
Example Calculation
A valid set of circumference measurements produces an estimated body-fat percentage and approximate fat/lean mass.
Limitations
Tape placement and measurement technique can materially affect the estimate. It is not equivalent to DXA or other clinical body-composition testing.
Frequently Asked Questions
Is this calculator exact?
No. It provides an estimate based on the inputs and method shown on the page.
Can I use the result as medical advice?
No. The result is for general informational and educational use and does not replace individualized advice from a qualified healthcare professional.
Can I switch between Metric and US units?
Where measurements are required, the calculator supports the unit systems displayed in the form.
Methodology & References
Uses a circumference-based body-fat estimate with sex-specific equations.