Core Tool
Body Fat Calculator
Estimate body fat % with the US Navy tape method — just a measuring tape, no machines.
Estimated body fat16.7%Fit
Fat mass12 kg
Lean mass60 kgMuscle, bone, water, organs
US Navy tape method (men): measure the waist at navel level without sucking in, and the neck just below the Adam's apple, both to the nearest half cm. Expect an error of roughly ±3% versus a DEXA scan — good enough to track change over time if you measure the same way each time.
General information for healthy adults — not medical advice. If you have a medical condition, are on medication, or anything feels off, talk to a doctor before acting on numbers from any calculator.