GLP-1 Weight-Loss Calculator
Enter your current weight and a medication to see an illustrative estimate based on average results from the clinical trials. It's a guide, not a prediction — real results vary a lot.
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How this estimate works
The figures here come from the average total body-weight reductions reported in the major clinical trials, alongside lifestyle changes: roughly 15% for semaglutide 2.4 mg (Wegovy), about 20% at higher doses of tirzepatide (Zepbound), and around 5–8% for liraglutide 3.0 mg (Saxenda). The calculator applies the average and a typical range to your weight.
Why your result will differ
These are averages over roughly 16–18 months at full doses. Individual results vary widely — some people lose more, a minority respond poorly, and your dose, starting weight, and habits all matter. Treat this as an illustration to set expectations, not a promise. Our weight-loss guide covers the realistic month-by-month picture, plateaus, and protecting muscle.
Frequently asked questions
How much weight can you lose on a GLP-1?
On average in trials: about 15% for semaglutide (Wegovy), roughly 20% at higher tirzepatide (Zepbound) doses, and about 5–8% for liraglutide (Saxenda). Averages — individuals vary widely.
Is this calculator a guarantee of results?
No. It applies clinical-trial averages to illustrate a typical range — it is not a prediction, and can't account for your dose, health or habits.
Sources & further reading
- STEP trials (semaglutide 2.4 mg) — average ~15% body-weight reduction at 68 weeks.
- SURMOUNT trials (tirzepatide) — average ~15–21% reduction across doses.
- SCALE trials (liraglutide 3.0 mg) — average ~5–8% reduction.