Know Your BMI.
Understand Your Body.
Body Mass Index is a quick, evidence-based screening tool used worldwide. Calculate yours in seconds—then read what it actually means.
Jump to calculatorBMI Calculator
Enter your height and weight to get your Body Mass Index
A number that tells a story—
but not the whole story
Body Mass Index (BMI) is calculated by dividing your weight in kilograms by the square of your height in metres. It was developed by Belgian mathematician Adolphe Quetelet in the 1830s and has since become the most widely used screening tool in public health. It does not directly measure body fat, but it correlates with more direct measures of body composition.
Standard WHO Classification
| BMI Range | Category | Health Risk |
|---|---|---|
| Below 18.5 | Underweight | Malnutrition, osteoporosis, immune deficiency |
| 18.5 – 24.9 | Normal Weight | Lowest risk for weight-related conditions |
| 25.0 – 29.9 | Overweight | Increased risk of heart disease, type 2 diabetes |
| 30.0 – 34.9 | Obese Class I | High risk; lifestyle modifications recommended |
| 35.0 – 39.9 | Obese Class II | Very high risk; medical evaluation advised |
| 40.0 and above | Obese Class III | Extremely high risk; specialist care recommended |
Steps toward a healthier weight
Balanced Nutrition
Fill half your plate with vegetables, a quarter with lean protein, and a quarter with whole grains. Limit ultra-processed foods.
Regular Movement
Aim for at least 150 minutes of moderate aerobic activity per week. Even daily 10-minute walks add up significantly.
Hydration
Drinking water before meals can reduce calorie intake. Most adults need 2–3 litres of fluids daily from all sources.
Quality Sleep
Poor sleep disrupts hunger hormones. Adults should target 7–9 hours nightly to support healthy weight management.