Health
Body Fat Calculator
Track your body composition. Enter your neck, waist, hips, height, and gender measurements to project body fat percentage, lean body mass, and fat mass.
About This Tool
This body composition tool calculates body fat percentage, fat mass, and lean body mass using US Navy and YMCA metrics.
US Navy Body Fat Formulas
Males: 86.010*log10(waist-neck) - 70.041*log10(height) + 36.76Calculates body fat percentage based on height and body circumferences (waist, hips, and neck). Different equations apply for males and females.
Examples
Male Fitness Assessment
Male, age 25, height 175cm, weight 70kg, neck 38cm, waist 82cm.
Result: Body fat percentage of 14.5%. Lean body mass of 59.82kg. Classified in the Fitness range.
FAQ
How accurate is the US Navy Circumference method?
The US Navy Circumference method is a highly reliable and low-cost alternative to dual-energy X-ray absorptiometry (DEXA) or hydrostatic weighing. For most people, it falls within 3% to 4% of the true body fat percentage.
What is healthy body fat percentage for men and women?
For men, a healthy range is typically 10% to 20% (ideal fitness) or up to 24% (average). For women, a healthy range is typically 18% to 28% (ideal fitness) or up to 31% (average). Values exceeding these are classified as obese.
What is the difference between body fat mass and lean body mass?
Body fat mass is the weight of all fat tissues in your body. Lean body mass (LBM) is the weight of everything else, including muscle tissue, bones, organs, and water weight.
Important Note
Health calculators are general screening and education tools. They are not a diagnosis or medical advice. Speak with a qualified clinician for personal health decisions.