Body fat calculator
Estimate body fat from height and circumferences in metric or imperial units.
Let’s run the numbers
USDYour answer starts here
Check your inputs and select Calculate.
Uses the historical Navy circumference estimate with unrounded inputs, not military half-inch rounding or current military qualification standards. A rough adult estimate, not a diagnosis; not intended for children or pregnancy. Weight is used only for fat and fat-free mass; fat-free mass is not muscle mass.
Common uses
Use male abdomen and neck or female waist, hips and neck measurements to estimate body fat percentage, fat mass and fat-free mass, with cm/in and kg/lb conversion.
BEHIND THE NUMBERSFormula & assumptions
Uses the historical Navy circumference estimate with unrounded inputs, not military half-inch rounding or current military qualification standards. A rough adult estimate, not a diagnosis; not intended for children or pregnancy. Weight is used only for fat and fat-free mass; fat-free mass is not muscle mass.