BMI Calculator — Free Online BMI Calculator

Calculate your Body Mass Index from height and weight, with the WHO category for your result.

The BMI Calculator is part of Toolio's Calculators collection — one of 64 free tools on the site. It is made for students, creators, office workers and anyone who needs a reliable bmi calculator without installing software or creating an account. It works on phones, tablets and computers, right in the browser.

How to use the BMI Calculator

  1. Enter your weight in kg and height in cm (or ft/in).
  2. Your BMI and category appear instantly.
  3. Read your result instantly, then copy or download it.

BMI Calculator — Frequently Asked Questions

Is this BMI Calculator free?

Yes — completely free. No sign-up, no account, no installation and no usage fees. Open the page and use it as much as you like.

Do my files leave my device?

No. This tool runs entirely in your browser using JavaScript — your files and text are processed on your own device and are never uploaded to a server.

Does it work on mobile?

Yes. Toolio is built mobile-first, so the BMI Calculator works in any modern phone browser — Android and iPhone — as well as on tablets and desktop computers, with nothing to install.

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