Body Fat Calculator
Estimate your body fat percentage, lean body mass, and fat mass using the proven U.S. Navy circumference method.
Take simple body measurements with a tape measure to get a reliable view of your body composition.
Enter Your Measurements
Fitness Range
Your body fat estimate is within the healthy fitness category.
Understanding Body Fat %
Body fat percentage represents the proportion of your total body weight that consists of adipose tissue versus lean mass (muscles, bones, organs, and fluids).
The U.S. Navy Method Formula
Calculated using logarithms derived from body circumference ratios relative to height:
Body Fat Categories Overview
| Classification | Men | Women |
|---|---|---|
| Essential Fat | 2% – 5% | 10% – 13% |
| Athletes | 6% – 13% | 14% – 20% |
| Fitness | 14% – 17% | 21% – 24% |
| Average | 18% – 24% | 25% – 31% |
| High Fat / Obese | 25%+ | 32%+ |
Tips for Accurate Measurement
- Flexible Tape: Use a snug, non-stretching tape measure without compressing your skin.
- Neck: Measure just below the larynx (Adam’s apple).
- Waist: Men measure at the navel; women measure at the narrowest point of the waist.
- Hips (Women): Measure around the widest part of the hips and buttocks.
Frequently Asked Questions
What is an ideal body fat percentage for men and women?
Fitness body fat ranges are typically 14%–17% for men and 21%–24% for women. Acceptable average health ranges are 18%–24% for men and 25%–31% for women.
How accurate is the U.S. Navy body fat formula?
The U.S. Navy method is generally accurate within 3% to 4% for most individuals when measurements are taken consistently with a proper tape measure.
What is Lean Body Mass (LBM)?
Lean Body Mass includes everything in your body except fat—such as muscle mass, bones, water content, organs, and connective tissue.