Free Online BMI Calculator
Enter your height and weight to calculate your Body Mass Index (BMI) and see where you fall on the standard BMI scale. Supports both metric and imperial units.
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How to Use the BMI Calculator
1
Select metric (kg/cm) or imperial (lbs/in) units.
2
Enter your weight and height.
3
View your BMI score and weight category.
Frequently Asked Questions
How is BMI calculated?
BMI = weight (kg) / height (m)². For imperial units: BMI = (weight (lbs) × 703) / height (inches)².
What are the BMI categories?
Underweight: below 18.5 | Normal: 18.5–24.9 | Overweight: 25–29.9 | Obese: 30 and above.
Is BMI a perfect measure of health?
BMI is a useful screening tool but does not directly measure body fat or account for muscle mass, bone density, or distribution of fat.