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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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Your result

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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.

Build a reliable scenario

How to use and verify your Body Fat Percentage Calculator result

Body Fat Percentage Calculator helps you check a specific health & family question with figures that apply to you. Estimate body fat percentage from U.S. customary circumference measurements using the Navy circumference equations. 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. The page keeps the method and limits visible so the result can be understood, compared, and checked instead of treated as an unexplained answer.

Before calculating

Prepare Equation, Height, Neck circumference, Waist circumference and Hip circumference. 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. Keep units, dates, currency, and time periods consistent.

What changes the result?

The stated method is: The estimate uses a sex-specific logarithmic circumference equation with height, neck, waist, and, when selected, hip measurements in inches. Change one assumption at a time to see which input drives the result, then compare scenarios on the same basis.

When checking the answer

Tape placement, posture, hydration, body shape, and the equation itself affect the estimate. It is not a DEXA scan, diagnosis, or measure of health. Use this only as a rough body-composition reference. It does not diagnose disease, determine a healthy target, or replace clinical assessment.

Quick verification checklist

• Confirm the date and unit of every input.
• Replace defaults with values that match your case.
• Compare the answer with a second scenario.
• Use the official source for regulated or high-impact decisions.

Source and update

Last reviewed: 2026-08-10

U.S. Navy — Body Composition Assessment guide

Frequently 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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