Navy Body Fat Calculator
Calculate your body fat percentage using the official U.S. Navy Body Composition Assessment (BCA) tape test method. Get instant pass/fail results based on OPNAVINST 6110.1 standards.
⚓ Sailor Information
📏 Measurements
Below larynx, perpendicular to neck axis
At navel, horizontal
At widest point of buttocks (females only)
--%
Estimated Body Fat Percentage
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Max Allowed (Your Age/Sex)
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Difference from Standard
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Navy BCA Standards
| Age Group | Male Max % | Female Max % |
|---|---|---|
| 17-21 | 22% | 33% |
| 22-29 | 23% | 34% |
| 30-39 | 24% | 35% |
| 40+ | 26% | 36% |
📏 Navy Measurement Procedure
- Neck: Just below the larynx (Adam's apple), tape perpendicular to the long axis of the neck. Round DOWN to nearest 0.5".
- Waist (Male): At the navel, horizontal, after exhaling. Round UP to nearest 0.5".
- Waist (Female): At the narrowest point (natural waist). Round UP to nearest 0.5".
- Hip (Female only): At the widest point of buttocks, viewed from side. Round UP to nearest 0.5".
Formula
Example (Male, 70" height, 16" neck, 35" waist):
Body Fat % = 86.010 × log₁₀(35 − 16) − 70.041 × log₁₀(70) + 36.76
Body Fat % = 86.010 × 1.279 − 70.041 × 1.845 + 36.76 ≈ 17.8%
Body Fat % = 86.010 × log₁₀(35 − 16) − 70.041 × log₁₀(70) + 36.76
Body Fat % = 86.010 × 1.279 − 70.041 × 1.845 + 36.76 ≈ 17.8%
Disclaimer: This calculator estimates body fat using the official Navy circumference method.
Official BCA results are determined by command fitness leaders using approved procedures. This tool is for
informational purposes only.
Frequently Asked Questions
When is the tape test required?+
Sailors who exceed screening table weight during weigh-ins are measured using the circumference-based BCA.
How is the Navy method different from Army?+
The formulas are mathematically identical. The difference is in rounding rules: Navy rounds neck DOWN, waist/hip UP; Army rounds all measurements UP.
What happens if I fail BCA?+
Sailors failing BCA are enrolled in the Fitness Enhancement Program (FEP) and may face administrative consequences if standards aren't met.