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The Body Index

Free body-metric calculators with no accounts or ads in results

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Free online calculators for body metrics like BMI alternatives, body fat, protein intake, and calorie deficits, with open-source formulas and no user accounts.

What it is

Screenshot of the The Body Index homepage
thebodyindex.com, as visitors see it

The Body Index provides free, focused calculator tools for body metrics that major calculator sites have not yet adopted. Each formula is implemented exactly as published in peer-reviewed research papers and linked to primary literature. The site offers calculators for body roundness index, waist-to-height ratio, relative fat mass, protein intake, calorie deficit timelines, and several others. Users can enter measurements once in the My Metrics dashboard to view all metrics together. All formulas are open source under the MIT license and available on GitHub for verification and reuse.

What it is built with

  • Open source formulas on GitHub

Pricing

Pricing model: Free

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Questions from the bench

What personal data does The Body Index collect?
The Body Index does not collect or store measurements. User height, weight, and waist data never leave the browser. The site uses Google Analytics and Cloudflare for hosting, but no user accounts are required and no personal information is collected through contact forms.
Are the calculators medically accurate?
The calculators provide educational, population-level screening estimates, not medical advice. Every formula is implemented exactly as published in its source paper and checked against reference worked examples, with links to primary literature on each calculator page.
Is the source code available for review?
Yes, all formulas are open source and available on GitHub at github.com/abdelilah-ka/body-metrics-formulas under the MIT license, allowing anyone to read, verify against papers, or reuse the code.

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More on this profile

The Body Index has a free listing. The owner can unlock the full profile with a paid launch for $5:

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