Online BMI Calculator — Free Body Mass Index Calculator
What is BMI?
Body Mass Index (BMI) is a screening tool used to categorize a person's weight relative to their height. It's calculated by dividing weight by height squared. Our BMI calculator supports both metric (centimeters/kilograms) and imperial (inches/pounds) units.
Why Use Our BMI Calculator?
- Dual unit support — Metric and imperial
- WHO categories — Instantly see your weight category (underweight, normal, overweight, obese)
- Private — Your height and weight stay in your browser
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How to Use
- Select metric or imperial units
- Enter your height and weight
- Your BMI and weight category display instantly
Frequently Asked Questions
Is BMI accurate for everyone?
BMI is a screening tool, not a diagnostic one. It doesn't account for muscle mass, bone density, or body composition. Consult a healthcare professional for a complete assessment.
What's a healthy BMI?
According to WHO, a BMI between 18.5 and 24.9 is considered normal (healthy) weight for adults.