Free BMI Calculator — Body Mass Index Online
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About This Tool
The BMI Calculator computes your Body Mass Index from your height and weight — in either metric or imperial units — and shows which WHO health category you fall into (underweight, normal, overweight, or obese). Enter your measurements and get your BMI instantly. Free, no account, runs in browser.
How to Use
- 1
Enter your height and weight in metric (cm/kg) or imperial (ft/in/lb).
- 2
Your BMI value and health category appear instantly.
- 3
Read the range chart to understand how your BMI compares to WHO guidelines.
Frequently Asked Questions
Is BMI an accurate measure of health?
BMI is a simple screening tool, not a diagnostic one. It does not account for muscle mass, age, or body composition. Athletic individuals often have high BMI despite low body fat.
What is a normal BMI range?
The WHO defines normal BMI as 18.5–24.9. Below 18.5 is underweight, 25–29.9 is overweight, and 30+ is obese.
Is this BMI calculator free?
Yes. Completely free with no account required.