Enter values and select Calculate to see your result.
Estimate adult body fat percentage from body measurements
Adult circumference estimate using the Navy logarithmic equations with measurements converted to inches. Measure waist at the navel for men, narrowest waist for women, and hips at the widest point. Not a diagnosis.
How to use the Body Fat Calculator
Estimate adult body-fat percentage from height, waist, neck and female-formula hip measurements.
- Select the sex option used by the Navy equation.
- Enter measurements in centimeters.
- Calculate and review the estimate with its method note.
Body Fat Calculator formula
The Navy method uses logarithms of circumference measurements and height after conversion to inches.
Worked example
Inputs: Male option, 175 cm height, 85 cm waist and 38 cm neck.
What to expect: The output is an estimated body-fat percentage based on the selected circumference formula.
How to read your result
Measure consistently and treat the result as an estimate; hydration and placement affect it.
Frequently asked questions
Is this a diagnosis?
No. It is a screening estimate and not a clinical assessment.
Where should I measure?
Use the method note and measure each circumference consistently.