Health tool

Body Fat Calculator

Use waist, neck, height and optional hip measurements for a rough body fat estimate.

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Instant useNo sign up, quick result.

Health focusedBuilt for quick body and calorie estimates.

Related next stepsJump to nearby health tools after.

Calculator

Use the body fat calculator

Estimate body fat percentage using the US Navy style formula inputs.

Sex: 1 for male, 2 for female

Height (cm)

Neck (cm)

Waist (cm)

Hip (cm, women)

Result: waiting for input

Enter your values to see the result.

How it works

Formula

Uses a common US Navy style body fat estimation formula.

Example

Measurements should be taken consistently and in the same units each time.

Frequently asked questions

Is this exact?

No. It is an estimate based on body measurements.

Why is hip optional?

It is used in the common female version of the formula.

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Tool guide

How to use the body fat calculator

Estimate body fat percentage using the US Navy style formula inputs. Use this page for a fast estimate, compare a few scenarios, and adjust the inputs until the result matches what you need to decide.

This tool also sits inside the CalcBeacon health cluster. That makes it easier to find from category pages, related tools, and supporting guides when you want to compare options.

When it is usefulUse this tool when you want a fast estimate, want to compare options, or want a clearer answer before moving on.

Common mistakesCheck that your numbers use the same units, avoid leaving key fields blank, and test a second scenario so you can see how sensitive the final result is.

Next useful stepAfter using this page, compare the result with a related calculator or open the guide to check the number in context.

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