Use our free BMI Calculator to calculate your Body Mass Index (BMI) using your height and weight. This tool provides a BMI score and a visual gauge to help you understand your result.
BMI Calculator
Calculate your Body Mass Index using your height and weight.
| Adult BMI Category | BMI Range |
|---|---|
| Underweight | Below 18.5 |
| Healthy weight | 18.5 to 24.9 |
| Overweight | 25 to 29.9 |
| Obesity | 30 or above |
BMI is a screening measure, not a diagnosis. Adult categories are not intended for people under 20. For ages 2 to 19, BMI must be interpreted using age and sex-specific percentiles.
What Is BMI?
Body Mass Index (BMI) is a measurement that compares a person's weight with their height. It is commonly used as a basic screening tool to assess weight categories in adults.
How to Calculate BMI
Enter your height and weight into the BMI Calculator and click the calculate button. The tool will display your BMI score and corresponding category.
The BMI formula is:
BMI = Weight (kg) ÷ Height (m)²
Adult BMI Categories
- Underweight: Below 18.5
- Healthy weight range: 18.5 to 24.9
- Overweight: 25 to 29.9
- Obesity range: 30 or above
These categories are intended for adults aged 20 and older. BMI is a screening measure, not a diagnosis, and does not directly measure body fat or overall health.
Frequently Asked Questions
Is this BMI Calculator free?
Yes, you can use this online BMI Calculator for free.
Is BMI a perfect measure of health?
No. BMI does not distinguish between muscle and fat, and it may not accurately reflect health in every individual.
Can teenagers use adult BMI categories?
No. For children and teenagers aged 2 to 19, BMI is interpreted using age and sex-specific percentiles rather than standard adult categories.
Disclaimer: This calculator is for educational purposes only and does not replace professional medical advice.