BMI Calculator

Enter your height and weight below to calculate your Body Mass Index (BMI).

What is BMI?

Body Mass Index (BMI) is a simple calculation using a persons height and weight. The formula is BMI = kg/m2. It is widely used by healthcare professionals as a screening tool to identify potential weight problems in adults. While BMI does not directly measure body fat, research shows it correlates reasonably well with direct measures of body fat in most people.

Understanding Your BMI Result

Your BMI result places you in one of several categories that indicate whether your weight is within a healthy range relative to your height. Each category carries different considerations for your health and well-being.

BMI Categories

• Underweight (less than 18.5): Being underweight may indicate malnutrition, an underlying health condition, or eating disorders. If your BMI falls in this range, consider consulting a healthcare provider to identify the cause and develop a plan to reach a healthier weight.
• Normal weight (18.5 to 24.9): This range is associated with the lowest risk of weight-related health issues. Continue maintaining a balanced diet and regular physical activity to support your overall health and well-being.
• Overweight (25 to 29.9): Excess weight can increase the risk of developing conditions such as high blood pressure, type 2 diabetes, and joint problems. Even modest weight loss of 5-10% can significantly improve your health markers.
• Obesity Class I (30 to 34.9): At this level, the risk of obesity-related health conditions is moderate to high. A structured weight management plan combining dietary changes and increased physical activity is recommended.
• Obesity Class II (35 to 39.9): Health risks become more significant at this stage. Professional medical guidance is strongly advised to develop a comprehensive weight loss strategy.
• Obesity Class III (40 or higher): This category carries the highest risk of serious health complications. Medical intervention, including possible surgical options, may be necessary alongside lifestyle modifications.

Important Limitations of BMI

While BMI is a useful screening tool, it has several important limitations to keep in mind. Athletes and individuals with high muscle mass may have a high BMI despite having very low body fat, since muscle weighs more than fat. Similarly, older adults typically lose muscle mass and bone density, which can result in a lower BMI that may mask excess body fat. BMI also does not account for where fat is stored in the body, which matters because abdominal fat poses greater health risks than fat stored in other areas. For these reasons, BMI should be considered one of many health indicators rather than a definitive diagnostic tool.

Tips for Achieving a Healthier BMI

If your BMI indicates that you are overweight or obese, making gradual, sustainable changes to your lifestyle is the most effective approach to long-term weight management. Focus on incorporating more whole foods into your diet, such as vegetables, fruits, lean proteins, and whole grains, while reducing your intake of processed foods, added sugars, and unhealthy fats. Aim for at least 150 minutes of moderate physical activity per week, such as brisk walking, swimming, or cycling. Additionally, prioritize getting adequate sleep, managing stress levels, and staying hydrated throughout the day. Remember that small consistent changes lead to lasting results.