Understanding BMI: How to Use a BMI Calculator Correctly

Body Mass Index (BMI) is a widely used tool to assess body weight relative to height. While it's not a perfect measure, it provides a useful starting point for understanding your health.

What is BMI?

BMI is calculated by dividing your weight in kilograms by your height in meters squared:

BMI = weight (kg) / height (m)²

BMI Categories

- **Underweight**: BMI < 18.5

- **Normal weight**: BMI 18.5 - 24.9

- **Overweight**: BMI 25 - 29.9

- **Obese**: BMI ≥ 30

How to Use Our BMI Calculator

1. Enter your weight (in kg or lbs)

2. Enter your height (in cm or ft/in)

3. Select your unit system (metric or imperial)

4. Click calculate to see your BMI and category

Limitations of BMI

BMI doesn't account for:

- Muscle mass (athletes may have high BMI but low body fat)

- Bone density

- Distribution of fat

- Age and gender differences

When BMI is Most Useful

BMI is most accurate for:

- General population screening

- Tracking weight changes over time

- Identifying potential health risks

- Population health studies

Beyond BMI

For a complete health picture, consider:

- Body fat percentage

- Waist circumference

- Blood pressure

- Cholesterol levels

- Physical fitness level

Conclusion

BMI is a useful tool but shouldn't be the only measure of health. Use our BMI calculator as a starting point, and consult with healthcare professionals for personalized advice.