Tool
BMI calculator
Body mass index (BMI) is a quick way to compare your weight to your height. It's a screening measure, not a diagnosis: it doesn't account for muscle, body shape or where weight is carried. Use your result as a starting point for a conversation with a health professional.
Your numbers stay on your device. We don't save or send anything you enter here.
What your result means (adults 20 and older)
| BMI | CDC category |
|---|---|
| Below 18.5 | Underweight |
| 18.5 to under 25 | Healthy weight |
| 25 to under 30 | Overweight |
| 30 to under 35 | Obesity, class 1 |
| 35 to under 40 | Obesity, class 2 |
| 40 or higher | Obesity, class 3 (severe obesity) |
BMI and weight-loss medication
BMI is one of the things doctors look at when deciding whether a prescription weight-loss medicine might be suitable. For example, the FDA approved tirzepatide for weight management in adults with a BMI of 30 or higher, or 27 or higher with at least one weight-related condition such as high blood pressure, type 2 diabetes or high cholesterol. Only a licensed provider can decide whether a medicine is right for you.
Read more: How GLP-1 weight-loss medications work