Compute your Body Mass Index and see the WHO category with a healthy weight range for your height.
| Category | BMI (kg/m²) |
|---|---|
| Underweight | < 18.5 |
| Normal weight | 18.5 – 24.9 |
| Overweight | 25.0 – 29.9 |
| Obesity class I | 30.0 – 34.9 |
| Obesity class II | 35.0 – 39.9 |
| Obesity class III | ≥ 40.0 |
BMI is a screening tool for adults and does not directly measure body fat or account for muscle mass, age, or ethnicity.
Calculate your Body Mass Index (BMI) instantly with our free BMI calculator. BMI is a widely used screening tool that estimates whether your weight falls within a healthy range for your height. Enter your height and weight below to get your BMI score along with its corresponding weight category.
BMI = weight (kg) / height (m)²
For imperial units: BMI = (weight (lb) / height (in)²) × 703
BMI Categories — Below 18.5: Underweight · 18.5–24.9: Normal weight · 25.0–29.9: Overweight · 30.0 and above: Obese.
BMI is a useful general screening tool, but it doesn't account for muscle mass, bone density, or body composition. Athletes and highly muscular individuals may show a higher BMI despite having low body fat.
For most adults, a BMI between 18.5 and 24.9 is considered a healthy weight range, according to WHO and CDC guidelines.
The BMI formula itself is the same for men and women, though body fat distribution and health risks associated with BMI can vary by sex, age, and ethnicity.
This calculator is designed for adults. Children and teens require age- and sex-specific BMI percentile charts, which differ from the adult BMI formula.