PlanetToolbox
Body Fat Calculator
Estimate adult body fat percentage, fat mass, lean mass, and a general fitness category using circumference measurements.
Body fat
17.5%
Category
Fitness
Fat mass
31.5 lb
Lean mass
148.5 lb
Body composition inputs
Estimate body fat percentage
Body fat summary
- Method
- U.S. Navy circumference estimate
- Body fat percentage
- 17.5%
- Fat mass
- 31.5 lb
- Lean mass
- 148.5 lb
Assumptions
Estimate typeCircumference-based adult estimate, not a diagnostic measurement.
Measurement noteUse relaxed tape measurements and keep units consistent.
Body fat calculator notes
This calculator uses a circumference-based adult estimate. Tape measurement error, hydration, body shape, pregnancy, athletic build, and medical conditions can materially change the result, so do not treat it as a diagnosis.