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Body Fat Percentage Calculator
Estimate body fat percentage from U.S. customary circumference measurements using the Navy circumference equations.
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Enter your values and select Calculate. Your result stays on this device.
How it works
The estimate uses a sex-specific logarithmic circumference equation with height, neck, waist, and, when selected, hip measurements in inches.
Assumptions
Tape placement, posture, hydration, body shape, and the equation itself affect the estimate. It is not a DEXA scan, diagnosis, or measure of health.
About this calculator
This body fat calculator estimates body fat percentage from tape measurements in inches. It is designed for an adult reference scenario, not a medical assessment, athletic clearance, or nutrition prescription.
How to use it
- Choose the equation that matches the published circumference method you intend to use.
- Measure height, neck, and waist in inches; add hip circumference for the female equation.
- Keep tape placement and posture consistent if you compare results over time.
- Use the estimate as one data point and seek qualified care for health, eating, or body-image concerns.
Use case
body fat calculator: a clear planning check
Estimate body fat percentage from U.S. customary circumference measurements using the Navy circumference equations. The stated formula, assumptions, and result limits remain visible so the calculation can be checked in context.
Use a clear body fat calculator scenario with values you can verify before relying on the result.
Source and update
Last reviewed: 2026-08-10
U.S. Navy — Body Composition Assessment guideFrequently asked questions
How does this body fat calculator work?
It applies a circumference-based equation to the measurements you enter. The result is an estimate, not a direct measurement of body fat.
Is a body fat percentage calculator medically accurate?
No calculator can replace a clinical assessment. Consistent tape measurement can be useful for a trend, but individual results vary.
Why does the calculator ask for different measurements?
The published circumference equations use different measurement combinations for their male and female equations.
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