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BMI Calculator — Calculate Your Body Mass Index

Calculate your Body Mass Index (BMI) to find out if you are underweight, normal weight, overweight or obese.

BMI Calculator

About BMI Calculator

BMI Calculator is a completely free online tool from FastTools that helps you get work done faster — no software to install, no account required, and no watermarks on your output. All processing runs securely in your browser, so your files never leave your device.

Key Features

Supports both metric (kg/cm) and imperial (lbs/inches)

Instant BMI calculation with health category

WHO standard BMI ranges used

Works for adults of all ages

Free with no sign-up

Why Use BMI Calculator?

In today's fast-paced digital world, having access to reliable, free online tools is essential. BMI Calculator saves you time and money by providing professional-grade functionality directly in your browser. Whether you're a student, freelancer, small business owner, or enterprise professional, this tool is built to make your workflow faster and more efficient.

Unlike desktop software that requires installation and often comes with subscription fees, BMI Calculator is completely free and works on any device — desktop, tablet, or mobile. There's no learning curve, no sign-up process, and no limitations on how many times you can use it.

Privacy & Security

Your privacy is our top priority. All processing happens directly in your browser — files are never uploaded to our servers, never stored, and never shared with third parties. Once you close your browser tab, there is no trace of your data anywhere. This makes FastTools one of the safest online tools available.

Frequently Asked Questions

What is a healthy BMI?
A BMI between 18.5 and 24.9 is considered healthy. Below 18.5 is underweight, 25-29.9 is overweight, and 30+ is obese.
Is BMI accurate for everyone?
BMI is a general indicator. It may not be accurate for athletes with high muscle mass or elderly individuals.
What BMI formula is used?
BMI = weight(kg) / height(m)². For imperial: BMI = (weight(lbs) × 703) / height(inches)².
Is it free?
Yes, completely free.