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BMI calculator for weight loss
Find your BMI, then see an estimate of your weight over 52 weeks on semaglutide or tirzepatide.
Your BMI
- UnderweightBelow 18.5
- Healthy18.5 to 24.9
- Overweight25 to 29.9
- Obese30 and above
Weight projections are shown for a BMI of 27 or higher.
Projected weight over 52 weeks
- Starting weight
- –
- Estimated at week 52
- –
- Change
- –
This is an estimate based on average results in clinical trials, not a prediction for you. Weight loss is personal, results vary and nothing is guaranteed. This tool is not medical advice.
Common questions
How is BMI calculated?
BMI compares your weight with your height: weight in pounds ÷ height in inches² × 703. Below 18.5 is underweight, 18.5 to 24.9 healthy, 25 to 29.9 overweight, and 30 or above obese. It is a screening number, not a diagnosis.
Why is there no weight projection for my BMI?
The projection uses average results from clinical trials of semaglutide and tirzepatide. Those trials enrolled adults with a BMI of 27 or higher, so below that range there are no results to base an estimate on.
How accurate is BMI?
BMI is a quick screening number. It does not measure body fat or where it sits, so it can overstate risk for muscular people and understate it for others. Age, sex and ethnic background also affect what a given BMI means. A clinician can put your number in context.
How is the 52-week projection estimated?
It applies average results from large clinical trials (STEP 1 and SURMOUNT-1) to your starting weight: about 14.5% of body weight for semaglutide and 19.4% for tirzepatide by week 52. The trials studied the brand-name medications alongside diet and activity changes, in adults with a BMI of 27 or higher, so the projection is only shown from that BMI up.
Who can be prescribed these medications?
Adults with a BMI of 30 or above, or 27 or above with a weight-related condition such as high blood pressure or type 2 diabetes. A licensed clinician decides whether treatment is right for you.