Body Fat Percentage Calculator
Estimate body fat percentage from height and circumference measurements using a common tape based equation.
Measure with a flexible tape. Keep the tape level and snug without compressing the skin.
Calculator
Enter your numbers, then select Calculate.
How the calculator works
The calculator uses sex specific logarithmic circumference equations based on height, neck, waist, and hip measurements. The Navy program itself uses official tables and procedures, so this formula result should be treated as an approximation.
How to use the result
Use the result as a consistent planning number. Record the inputs with the answer so a later comparison uses the same method.
Recalculate when the underlying inputs change. Avoid comparing results created with different units, measurement methods, or machine settings.
What the result does not include
Tape placement and body shape can create meaningful error. Do not use this estimate to diagnose health, set a personal weight target, or replace a clinician or validated laboratory method.
Frequently asked questions
Is this an official Navy pass or fail result?
No. It is a formula based estimate. Official assessments must follow the current service procedure and tables.
Why can the number change between measurements?
Small changes in tape position, tension, breathing, hydration, and time of day can change circumference results.
References
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Medical disclaimer: This article is general product information, not medical advice. The equipment described here is not a treatment for any condition. If you have an injury, ongoing pain, or a medical condition, talk to a doctor or physical therapist before using any of it.