Free BMI Calculator
Calculate Body Mass Index (BMI) from height and weight and view the standard adult BMI category ranges.
Calculate your Body Mass Index (BMI), BMI Prime, Ponderal Index, and healthy weight range for your height.
BMI Categories (Adults)
| Classification | 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 |
About BMI Calculator
Use this BMI calculator as a general educational screening tool based on height and weight. BMI does not directly measure body fat or diagnose a health condition.
How to use this tool
- Enter your height and weight.
- Calculate your BMI.
- Use the displayed category as general information, not a medical diagnosis.
Frequently asked questions
No. BMI is a screening measure and should not be used by itself to diagnose health conditions.
Standard adult BMI categories have limitations and may not be appropriate for children, pregnancy, athletes with high muscle mass or some other situations.
This tool provides general educational information and is not a diagnosis or a substitute for advice from a qualified healthcare professional.