Adult BMI category table
| Category | BMI range | What it can mean |
|---|---|---|
| Underweight | Below 18.5 | A BMI below 18.5 is usually classified as underweight for adults. It can be worth discussing if it is unexpected or linked with symptoms. |
| Healthy BMI range | 18.5 to 24.9 | This is the commonly used adult healthy-weight range. It is a screening category, not a guarantee of overall health. |
| Overweight | 25 to 29.9 | This range suggests body weight is above the common healthy BMI range for height, but BMI should be interpreted with other health measures. |
| Obesity | 30 or higher | A BMI of 30 or higher is in the adult obesity range. A healthcare provider can interpret this alongside personal risk factors. |
How BMI categories are used
BMI categories are a quick way to compare weight with height for adults. They are useful for public health research and as a first screening tool in everyday health discussions. A category can suggest when weight might deserve a closer look, but it does not explain body composition, fitness, medical history or where body fat is carried.
Two adults can have the same BMI category and very different health profiles. For that reason, BMI is best combined with other markers such as waist measurement, blood pressure, cholesterol, blood sugar, activity level and personal medical history.
Useful next steps
Medical disclaimer
This calculator is for general informational purposes only and does not replace professional medical advice. Always consult a qualified healthcare provider for personal health concerns.