Health & WellnessComposition
US Navy Body Fat Percentage Calculator
Estimate your body fat percentage, lean body mass, and total fat mass with high accuracy using tape measurements and the official US Navy method.
Tape Circumference Measurements (cm)
Body Fat Percentage (US Navy)
13.7%
Athletic
Lean Body Mass (LBM):69 kg
Total Body Fat Mass:11 kg
Mathematical Formula: US Navy Circumference Method
Male: 495 / (1.0324 - 0.19077·log₁₀(W - N) + 0.15456·log₁₀(H)) - 450
Uses logarithms of waist, neck, hip (for females), and height circumferences.
How to Use This Calculator
- 1Select gender and enter height and weight.
- 2Measure neck circumference just below the larynx (Adam’s apple).
- 3Measure waist circumference horizontally at the navel (men) or narrowest point (women).
- 4For women, also enter hip circumference at the widest point.
- 5Get body fat percentage, fat mass (kg), lean mass (kg), and fitness category.
Practical Example: Male Fitness Example
Scenario: Male, 180 cm tall, 80 kg, Neck 38 cm, Waist 82 cm.
Height:180 cm
Weight:80 kg
Neck:38 cm
Waist:82 cm
Result: Body Fat: 13.8% (Athletic/Fitness) | Fat Mass: 11.0 kg | Lean Body Mass: 69.0 kg
13.8% body fat provides clear abdominal definition and optimal athletic performance.
Frequently Asked Questions
For men: Essential fat is 2-5%, Athletes 6-13%, Fitness 14-17%, Average 18-24%. For women: Essential fat is 10-13%, Athletes 14-20%, Fitness 21-24%, Average 25-31%.
Pro Calculation Tips
- Take measurements first thing in the morning before eating or working out for consistent tracking.
Model Assumptions
- Tape measurement accuracy depends on measuring at the exact anatomical landmarks without compressing the skin.