Free BMI Calculator by Calcstation. Enter your height and weight to get your BMI, category, and healthy weight range in seconds.
BMI Calculator
Modify the values and click “Calculate” to use.
BMI Categories (WHO)
| Classification | BMI (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 |
The Body Mass Index (BMI) Calculator helps you determine your BMI value and corresponding weight category, while also taking your age into account. You can use the “Metric Units” tab to enter measurements in the International System of Units, or the “Other Units” tab to convert between US and metric units. In addition to BMI, the calculator also provides the Ponderal Index, which offers another way to assess body composition.
What is BMI?
BMI is a measure of body fat based on your height and weight. It provides a simple way to categorize whether a person is underweight, has a healthy weight, is overweight, or is obese. The calculation helps quantify tissue mass and serves as a general indicator of healthy body weight for your height.
The BMI categories may differ depending on factors such as age and region, and they are sometimes subdivided into more specific levels, like severely underweight or very severely obese. Maintaining a healthy BMI is important, as being significantly underweight or overweight can impact your overall health. While BMI is not a perfect measurement, it is a valuable tool to indicate whether further evaluation or lifestyle changes may be needed.
Refer to the table below to see the BMI categories used by this calculator.