Calculate Your Body Mass Index (BMI)
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What is Body Mass Index (BMI) and Why Does it Matter?
The Body Mass Index (BMI) is a simple numerical measure used to classify individuals into different weight categories—underweight, healthy weight, overweight, and obesity. Developed in the 19th century by Adolphe Quetelet, the BMI is a valuable screening tool for identifying potential weight problems in adults. It calculates body fat based on your height and weight, using the formula: BMI = kg / (m²).
While not a direct measure of body fat, the BMI is widely used by health professionals as an easy way to screen for potential health risks associated with weight. Use our free, professional BMI Calculator above to determine your index based on the Metric System (kilograms and centimeters).
Understanding BMI Categories and Ranges
The World Health Organization (WHO) and Centers for Disease Control and Prevention (CDC) use the following standard BMI ranges for adults. Knowing your category is the first step toward maintaining a healthier lifestyle and reducing the risk of weight-related health conditions:
- Underweight: Below 18.5 – May indicate nutritional deficiencies.
- Healthy Weight: 18.5 – 24.9 – Associated with the lowest risk of chronic diseases.
- Overweight: 25.0 – 29.9 – Increased risk of heart disease and type 2 diabetes.
- Obesity: 30.0 and above – High risk of severe health complications.
Always consult a healthcare professional for personalized advice regarding your ideal weight and health goals.
Frequently Asked Questions (FAQs) About BMI
1. What is the ideal BMI range for adults?
The ideal BMI range for most adults is considered to be between 18.5 and 24.9. This range is often referred to as the 'Healthy Weight' range and is associated with the lowest health risks.
2. Is the BMI Calculator accurate for everyone?
No, the BMI is a screening tool, not a diagnostic one. It is important to note that BMI is generally not accurate for highly muscular individuals (like bodybuilders) because muscle weighs more than fat, leading to an artificially high BMI. It is also not typically used for pregnant women or children.
3. How often should I check my BMI?
For general health monitoring and tracking progress on a diet plan or fitness routine, checking your BMI every three to six months is generally sufficient. If you are starting a new weight management program, you might check it monthly.
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