BMI Calculator
Calculate your Body Mass Index (BMI) in metric or imperial units with instant health category results
BMI Classification Chart
| BMI Range | Category | Health Risk |
|---|---|---|
| Below 18.5 | Underweight | Increased risk of malnutrition, osteoporosis |
| 18.5 – 24.9 | Normal Weight | Lowest health risk |
| 25.0 – 29.9 | Overweight | Moderate risk of heart disease, diabetes |
| 30.0 – 34.9 | Obese Class I | High risk |
| 35.0 – 39.9 | Obese Class II | Very high risk |
| 40.0 and above | Obese Class III | Extremely high risk |
What Is BMI?
Body Mass Index (BMI) is a simple numerical value calculated from your height and weight that is used as a screening tool to classify weight status. A higher BMI can indicate higher amounts of body fat, though it is not a direct measurement of body fat percentage. BMI is widely used by healthcare professionals as an initial assessment tool because it's quick to calculate and correlates with direct measurements of body fat in most people.
Limitations of BMI
While BMI is useful as a general screening tool, it has notable limitations. It does not distinguish between muscle mass and fat mass, meaning muscular athletes may have a high BMI without being overweight. It doesn't account for age-related changes in body composition, differences between ethnic groups, or differences between male and female body composition. Always consult with a healthcare professional for a complete assessment of your health status.
How to Maintain a Healthy BMI
Maintaining a healthy BMI involves a balanced combination of regular physical activity and a nutritious diet. Aim for at least 150 minutes of moderate aerobic activity per week. Focus on whole foods including fruits, vegetables, lean proteins, and whole grains. Minimize processed foods, added sugars, and excessive saturated fats. Small, consistent lifestyle changes over time are more effective and sustainable than extreme diets or exercise regimens.