BMI Calculator — Free Online Tool
Calculate your Body Mass Index (BMI) by entering height and weight in metric (cm/kg) or imperial (ft/in/lb) units. Results show your BMI value, the WHO classification (Underweight, Normal, Overweight, Obese), and the healthy weight range for your height.
100% client-side. No uploads. Your data never leaves your browser.
How to use BMI Calculator
- Choose metric (cm/kg) or imperial (ft/in/lb) units.
- Enter your height and weight.
- Your BMI value and WHO category appear instantly.
- Check the 'Healthy weight range' section to see the target range for your height.
Frequently Asked Questions
What are the WHO BMI categories?
Underweight: < 18.5, Normal weight: 18.5–24.9, Overweight: 25–29.9, Obese: ≥ 30. These are the World Health Organization classifications.
Is BMI accurate for athletes or elderly people?
BMI is a population-level screening tool. It may overestimate body fat in athletes (high muscle mass) and underestimate it in older adults (low muscle mass).
Can I enter height in feet and inches separately?
Yes. In imperial mode, separate fields accept feet and inches.
Related tools
Related reading
Browse all free tools · theproductguy.in