What is BMI?

Body Mass Index (BMI) is a simple calculation using a person's height and weight. The formula is BMI = kg/m² where kg is a person's weight in kilograms and m² is their height in metres squared.

For most people, BMI is a reliable indicator of body fatness and is used as a screening tool to identify weight categories that may lead to health problems. It's an easy-to-perform and inexpensive method to help health professionals determine who is at greater risk for health issues.

Understanding Your Result

This tool provides a BMI score and a corresponding category. The World Health Organization (WHO) defines the following categories:

Health Risks of Being Overweight

Being overweight (BMI 25-29.9) or obese (BMI 30+) increases the risk of developing numerous health problems. The higher your BMI, the greater the risk. These conditions include:

• Type 2 diabetes
• High blood pressure (hypertension)
• Heart disease and stroke
• Certain types of cancer
• Sleep apnea and breathing problems
• Osteoarthritis (joint pain)
• Gallbladder disease

Health Risks of Being Underweight

Being underweight (BMI less than 18.5) can also pose health risks. A low BMI may be a sign of malnutrition, an underlying medical condition, or an eating disorder. Health risks include:

• Malnutrition and vitamin deficiencies (e.g., anemia)
• Weakened immune system
• Osteoporosis (brittle bones)
• Fertility issues
• Developmental problems, especially in children and teens

Limitations of BMI

It's important to remember that BMI is a screening tool, not a diagnostic test. It does not directly measure body fat and can be misleading in some cases. For example, BMI may:

• Underestimate body fat in older adults or those with low muscle mass.
• Overestimate body fat in individuals who are very muscular, such as athletes.

Always consult with a healthcare provider for a more complete assessment of your health and any associated risks.