Free tool
BMI calculator for weight-loss medication
Enter your height and weight to find your body mass index, and see whether you may meet the BMI criteria physicians use for prescription weight-loss medication.
Your BMI
—
Enter your height and weight to see your BMI and whether you may meet the usual BMI criteria for weight-loss medication.
What is BMI?
Body mass index (BMI) compares your weight to your height. It's your weight in kilograms divided by your height in meters squared, or, in pounds and inches, 703 times your weight divided by your height squared. It's quick, free and the same for everyone, which is why doctors use it as a first screen.
How to read your result
These are the standard ranges for adults:
| BMI | Category |
|---|---|
| Below 18.5 | Underweight |
| 18.5 to 24.9 | Healthy weight |
| 25 to 29.9 | Overweight |
| 30 or higher | Obesity |
BMI and weight-loss medication
Prescription weight-loss medications are generally labeled for 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. That includes FDA-approved diet medications like phentermine. A BMI in range is a starting point, not a prescription: your physician also considers your health history, your current medications and your goals.
See who weight-loss medication is for, the treatments our physicians prescribe and what they cost.
Waist size matters too
Where you carry weight affects health as well as how much you carry. Weight around the middle is linked with a higher risk of type 2 diabetes, high blood pressure and heart disease. National Institutes of Health guidance treats a waist measurement above 40 inches for men, or above 35 inches for women, as a sign of higher risk at the same BMI. To measure, wrap a tape around your bare stomach just above your hip bones and breathe out normally. Share the number in your intake: your physician weighs it with your BMI, your blood pressure and your history.
What BMI doesn't tell you
BMI doesn't measure body fat directly. It can read high for very muscular people and low for older adults who have lost muscle, and it doesn't show where weight is carried, which also matters for health. It isn't meant for children, teens or pregnancy. Treat it as one number among several, and talk with a physician about what it means for you.
This calculator is for general education and isn't medical advice. Only a licensed physician can decide whether a medication is right for you.
Your physician is waiting to meet you.
A 10-minute eligibility check is all it takes to begin. No judgment, no waiting rooms. Just care that finally feels personal.
No insurance required · Cancel before your next refill is billed · FSA/HSA eligible