What can I do with Body Fat Calculator?

Estimate body fat percentage with the US Navy method. Body Fat Calculator is part of the Health shelf on utils.sbs and is designed for quick, one-off tasks.

Is Body Fat Calculator free to use?

Yes. Body Fat Calculator is free, requires no account, and has no per-file or per-use charge.

Are my files uploaded when I use Body Fat Calculator?

No. Body Fat Calculator is designed to process your input locally in the browser. Files are not uploaded to a server for processing.

What formats does Body Fat Calculator support?

It accepts numeric inputs and returns a clearly formatted calculation with an explanation where relevant.

Can I use Body Fat Calculator on my phone?

Yes. Body Fat Calculator is responsive and works in modern mobile browsers. Very large files may be limited by the device's available memory.

Health tool

Body Fat Calculator

Estimate body fat percentage with the US Navy method.

Runs on-deviceNo sign-upFree

All health tools

Workspace

Body Fat Calculator

Runs locally

Sex

Waist

Neck

Height

Hip (women)

Results update as you change the inputs. Formulas are standard reference calculations; finance and health tools are estimates, not advice.

Result

Waiting for values…

Full breakdown

The guide

By the utils.sbs team · Reviewed November 2026 · How we build and review tools

Quick answer

Body Fat Calculator is a free browser-based health tool. Estimate body fat percentage with the US Navy method. It runs with JavaScript arithmetic locally, requires no account and does not upload your files. Open the page, add your input, adjust any options and download the result.

What is Body Fat Calculator?

Body Fat Calculator is a free browser-based health tool from utils.sbs. Estimate body fat percentage with the US Navy method. It is built for quick, focused jobs: open the page, add your input, adjust the options and take the result with you. No account, install or server upload is required.

At a glance

Category	Health
Input	Numbers and the options shown on this page
Output	A formatted result with intermediate values where relevant
Engine	JavaScript arithmetic
Processing	In your browser
Price	Free
Account	Not required

How Body Fat Calculator works

The calculator applies standard formulas with JavaScript number precision and shows the result immediately. Values are not sent anywhere.

How to use Body Fat Calculator

1Open Body Fat Calculator and add your input.
2Adjust the options: sex, waist, neck, height and more.
3Run the tool, check the preview or result, and download the output.

When to use Body Fat Calculator

Check a calculation before making a decision.
Work through a homework or reference problem with visible steps.
Sanity-check a financial, health or geometry estimate.

Inputs and options

Sex: Choose one of 2 options.
Waist: Enter a numeric value in cm.
Neck: Enter a numeric value in cm.
Height: Enter a numeric value in cm.
Hip (women): Enter a numeric value in cm.

Limitations

Results are reference calculations. Verify financial, medical, legal or safety-critical decisions independently.

Privacy and accuracy

Body Fat Calculator processes its input in the browser whenever the platform API allows it. Files and values are not uploaded to a server for processing, and the tool does not require an account. For calculations, use the result as a reference and verify important decisions against the source formula or a qualified professional. Read our methodology.

FAQ