Free tool · Weight change
GLP-1 Weight Loss Trajectory Calculator
See what a published average weight change would look like at your starting weight. This is not a prediction for you.
Use this toolHow this was calculated
See what published trial-average percent weight change would equal at your starting weight.
The calculator multiplies your starting weight by published mean percent body-weight change at the trial’s reported time point. Intermediate weeks are not interpolated from figures.
Important limitations
- What you will weigh at a future week.
- Whether a medication is right for you.
- Whether you should start, stop, or change a dose.
Research & sources
- Once-Weekly Semaglutide in Adults with Overweight or Obesity (STEP 1)
New England Journal of Medicine · 2021-03-18 · Last verified 2026-09-16
Encoded published week-68 mean percent body-weight change only. Intermediate figure points are not interpolated.
- Tirzepatide Once Weekly for the Treatment of Obesity (SURMOUNT-1)
New England Journal of Medicine · 2022-07-21 · Last verified 2026-09-16
Encoded published week-72 mean percent body-weight change for 5 mg, 10 mg, and 15 mg only.
- A Randomized, Controlled Trial of 3.0 mg of Liraglutide in Weight Management (SCALE Obesity and Prediabetes)
New England Journal of Medicine · 2015-07-02 · Last verified 2026-09-16
Encoded the published week-56 mean percent body-weight change (−8.0% liraglutide 3.0 mg vs −2.6% placebo).
Related WellForm MD resources
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These tools are free public education. WellForm MD also provides physician-led medical weight-loss care when you want a plan that belongs to you.