HEALTH RESULT
Result
Review the estimate based on the information you entered.
Result Overview
Key resultUse the estimate as an informational reference.
Result at a Glance
Key detailsAbout this tool
Body Fat Calculator
Estimate body-fat percentage using the U.S. Navy circumference equation and show estimated fat mass and lean mass for easier interpretation.
Understand how circumference-based body-fat estimation works, what the U.S. Navy equation measures, and why body-fat estimates should be treated as approximations.
What it estimates
The calculator estimates body-fat percentage from sex, height, waist, neck and—where applicable—hip circumference. It then estimates fat mass and lean mass from body weight.
How measurements affect the result
Small measurement differences can materially change the estimate. Measure consistently, use the same units and avoid tightening the tape excessively.
How the equation works
The circumference equation uses logarithmic relationships among body dimensions and height. It is a field estimate, not a laboratory measurement.
Body-fat percentage versus BMI
BMI uses height and weight, while body-fat estimation attempts to account for body dimensions associated with fat distribution. Neither should be treated as a complete health assessment.
Using the result
Track trends under consistent measurement conditions rather than focusing on tiny day-to-day changes.
Health note
Body composition can be affected by age, sex, hydration, training and measurement technique. Seek professional assessment when a medical decision depends on body composition.
Related Health Tools
Explore related Tervilo calculators for a broader view of the same topic.
Questions & Answers
Frequently Asked Questions
What does the Body Fat Calculator calculate?
It provides an estimate from the inputs you enter. Review the detailed guide on this page for formulas, interpretation, assumptions and limitations.
How does the Body Fat Calculator estimate body fat?
It uses the U.S. Navy circumference equation with height and body measurements. The result is a field estimate and can differ from clinical body-composition measurements.
Why can body-fat estimates vary?
Measurement technique, hydration, body shape, muscle mass and equation limitations can all change the estimate. Consistent measurement conditions make trends easier to compare.
Is estimated body fat a medical diagnosis?
No. It is an estimate from circumference measurements and should not be used as a diagnosis or clinical body-composition assessment.