📏 Body Fat Calculator
Estimate your body fat percentage using the US Navy circumference method, plus your fat mass and lean mass.
Your Measurements
Your Result
| Category | Men | Women |
|---|---|---|
| Essential Fat | 2–5% | 10–13% |
| Athletic | 6–13% | 14–20% |
| Fitness | 14–17% | 21–24% |
| Average | 18–24% | 25–31% |
| Obese | 25%+ | 32%+ |
This is an estimate based on the US Navy circumference method. It is not a substitute for clinical body composition testing. Consult a healthcare provider for a full assessment.
How the Body Fat Calculator Works
This calculator uses the US Navy circumference method, which estimates body fat percentage from simple tape-measure measurements of your neck, waist, and (for women) hips, combined with your height.
Formula
Women: BF% = 495 / (1.29579 − 0.35004 × log10(waist + hip − neck) + 0.22100 × log10(height)) − 450
(all measurements in cm)
This tool provides general estimates for informational purposes only and is not medical advice. Consult a doctor or trained professional for accurate body composition assessment.
Frequently Asked Questions
How accurate is the US Navy body fat method?
The Navy method is generally accurate within about 3-4% body fat for most people, making it a convenient alternative to more expensive methods like DEXA scans or hydrostatic weighing.
Where should I measure my waist and neck?
Measure your neck just below the larynx, and your waist at the narrowest point (men) or at the navel (women), keeping the tape snug but not compressing the skin.
What is a healthy body fat percentage?
A "fitness" range is typically 14-17% for men and 21-24% for women, while "average" ranges run higher. Healthy ranges vary by age and individual goals.