Body Mass Index (BMI) is a widely used screening tool that provides a simple numeric measure of body fat based on height and weight. While it doesn't directly measure body fat, it correlates with more direct measures of body fat and offers a quick assessment of weight categories that may lead to health problems.

How BMI is Calculated

BMI is calculated using a simple formula:

BMI = weight (kg) / height² (m)

For those using pounds and inches, the formula is adjusted:

BMI = (weight (lb) / height² (in)) × 703

BMI Categories

The World Health Organization defines these standard categories:

• Underweight: BMI less than 18.5
• Normal weight: BMI 18.5 to 24.9
• Overweight: BMI 25 to 29.9
• Obesity: BMI 30 or greater

Limitations of BMI

While BMI is a useful screening tool, it has limitations:

• Doesn't distinguish between muscle and fat (athletes may have high BMI without excess fat)
• May underestimate body fat in older adults who have lost muscle mass
• Doesn't account for fat distribution (abdominal fat is more dangerous)
• May not be equally accurate across all ethnic groups

Using Our BMI Calculator

Our BMI Calculator makes it easy to determine your BMI. Simply enter your height and weight, and the calculator does the math for you, providing your BMI score along with its weight category.

Remember that BMI is just one indicator of health. Always consult with a healthcare professional for a comprehensive health assessment.