Calculate your Body Mass Index using WHO and CDC standards.
Your Measurements
Your BMI
BMI Categories (WHO / CDC)
| Underweight | Below 18.5 | |
| Normal weight | 18.5 – 24.9 | |
| Overweight | 25.0 – 29.9 | |
| Obese class I | 30.0 – 34.9 | |
| Obese class II | 35.0 – 39.9 | |
| Obese class III | 40.0 and above |
BMI formula (metric): BMI = weight(kg) ÷ height(m)². For imperial: BMI = 703 × weight(lbs) ÷ height(inches)².
Healthy weight range is calculated by finding the weight that gives a BMI of 18.5 (lower bound) and 24.9 (upper bound) for your height.
BMI classifications are the same for adult males and females per WHO/CDC guidelines. Children use age- and sex-specific percentile charts instead.
⚠️ BMI is a screening tool, not a diagnostic measure. It does not account for muscle mass, bone density, age-related changes, or distribution of fat. People with high muscle mass may have a high BMI without excess body fat. Consult a healthcare provider for a complete health assessment.