Use this BMI Calculator to determine your Body Mass Index (BMI) and understand your weight category based on your height, weight, age, and sex. Choose between Metric Units or US Units for accurate calculations. In addition to BMI, the tool also calculates the Ponderal Index, which is especially useful for individuals who are extremely tall or short.
Body Mass Index (BMI) is a numerical value that indicates whether your body weight is healthy relative to your height. It’s widely used as a general health indicator and helps classify individuals into different weight categories:
Underweight
Normal weight
Overweight
Obese
BMI is a quick screening tool, but it doesn’t directly measure body fat or muscle mass. It’s best used along with other assessments.
| Category | BMI Range (kg/m²) |
|---|---|
| Severe Thinness | < 16 |
| Moderate Thinness | 16 – 17 |
| Mild Thinness | 17 – 18.5 |
| Normal | 18.5 – 25 |
| Overweight | 25 – 30 |
| Obese Class I | 30 – 35 |
| Obese Class II | 35 – 40 |
| Obese Class III | > 40 |
| Category | Percentile Range |
|---|---|
| Underweight | < 5th percentile |
| Healthy Weight | 5th – 85th |
| At Risk of Overweight | 85th – 95th |
| Overweight | > 95th |
