Question
How is body fat percentage calculated here?
This calculator uses the U.S. Navy body fat formula, which estimates body fat from height and circumference measurements such as neck and waist, plus hip measurements for women.
Fitness
Use OmniCalc's body fat calculator to estimate body fat percentage, fat mass, and lean mass from practical body measurements.
Body fat calculator
Use a tape measure and a current body weight to estimate body-fat percentage, fat mass, and lean mass quickly.
For the navy method to work well, waist must be larger than neck. Women also need a hip measurement.
Why this result matters
Tape-measure body composition estimates without the spreadsheet work. Use the tool above to enter a few clear inputs and get a practical answer you can use right away.
This body fat calculator helps people move beyond scale weight and estimate body composition using simple circumference measurements. It is useful for fat-loss tracking, physique planning, and comparing progress over time when a quick body fat estimate is more useful than body weight alone.
Formula and method
This calculator uses the U.S. Navy body fat method, which estimates body fat percentage from height and circumference measurements. The result is an estimate rather than a lab reading, but it is still useful for tracking direction and planning decisions.
Example
If you are tracking a cut, recomp, or general fitness goal, this calculator helps you compare fat percentage with estimated lean mass instead of relying on body weight alone.
FAQ
Short answers to the questions people often ask before or after using the tool.
Question
This calculator uses the U.S. Navy body fat formula, which estimates body fat from height and circumference measurements such as neck and waist, plus hip measurements for women.
Question
It provides an estimate, not a clinical measurement. It is most useful when you measure consistently and compare progress trends over time rather than obsessing over a single reading.
Question
Body weight alone cannot show how much of your body mass is likely fat versus lean tissue. A body fat estimate can give more context when you are trying to cut, bulk, or monitor composition changes.
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