BMI Calculator
Calculate your Body Mass Index from height and weight, in metric or imperial units.
cm
kg
How to use BMI Calculator
- 1Enter your input for bmi calculator.
- 2Review the result on this page.
- 3Download or copy your result.
Frequently Asked Questions
How is BMI calculated?
BMI = weight (kg) ÷ height (m)². This calculator supports both metric and imperial units and converts automatically.
What do the BMI categories mean?
Under 18.5 is underweight, 18.5–24.9 is normal, 25–29.9 is overweight, and 30+ is obese, per WHO standards. BMI doesn't account for muscle mass or body composition, so treat it as a general guide rather than a diagnosis.
Is this tool really free?
Yes, BMI Calculator is completely free to use — no sign-up, no hidden charges.