Body Fat Calculator
Calculate your body fat percentage using the US Navy method
Enter Your Measurements
Measure at the navel (men) or narrowest point (women)
Measure below the larynx, sloping downward to the front
Your Body Fat Result
Enter your measurements above to estimate body fat percentage
Body Fat Categories (ACE)
Male
Female
US Navy Method
Uses circumference measurements with a logarithmic formula validated by the US Navy for field use.
How to Measure
Use a flexible tape measure. Keep it snug but not tight. Measure to the nearest 0.5 cm or 0.25 inch.
Lean Body Mass
Your lean mass includes muscles, bones, organs, and water. Enter your weight to see this breakdown.
This estimate uses the US Navy circumference method. Results may vary ±3–4% from DEXA scans. Consult a healthcare professional for clinical assessment.
Frequently asked questions
How accurate is the US Navy body fat method?
The US Navy method typically comes within 3–4% of DEXA scan results. It is more accurate than BMI for estimating body composition and is widely used by the military and fitness professionals for field assessments.
Where do I measure waist circumference for this calculator?
Men measure at the navel. Women measure at the narrowest point of the torso (natural waist). Keep the tape parallel to the floor and snug but not compressing the skin.
What is a healthy body fat percentage?
For men, 14–17% is fitness level and 18–24% is average. For women, 21–24% is fitness level and 25–31% is average. Athletes typically range 6–13% (men) and 14–20% (women).
What is lean body mass?
Lean body mass (LBM) is your total weight minus fat mass. It includes muscles, bones, organs, and water. A higher LBM relative to total weight generally indicates better metabolic health.