GLP-1 Weight Loss Projector
Enter your starting and goal weight to see a projected timeline based on clinical trial averages for semaglutide and tirzepatide. Milestones at weeks 4, 8, 12, 24, 36, and 52.
Get your personalized plan
We'll send you a free plan based on your results — plus tips to hit your goal faster.
Frequently Asked Questions
How much weight can you lose on GLP-1 medications?
Clinical trials show 15–22% body weight loss over 68 weeks on semaglutide 2.4mg (Wegovy). Tirzepatide (Mounjaro) shows even higher results — up to 22% in the SURMOUNT-1 trial. Individual results depend on dose, adherence, diet, and exercise.
How long before GLP-1 starts working?
Most people see measurable weight loss within 4–8 weeks, though early weeks are often spent titrating the dose to minimise side effects. The greatest rate of loss typically occurs during the dose escalation phase.
Does GLP-1 weight loss continue forever?
No. Plateaus typically occur around 36–52 weeks as the body adapts. At that point, weight loss slows significantly or stops. Some people see a slight rebound even while continuing medication. This is why lifestyle habits remain critical.
What happens if you stop GLP-1 medication?
Most clinical trial data shows significant weight regain — often 2/3 of lost weight within 1–2 years of stopping — without sustained lifestyle changes. GLP-1s work best as a tool alongside lasting nutrition and movement habits.
Track this daily in tr8ck
Track your weight, meals, and habits alongside your GLP-1 journey. tr8ck shows you what's working — and helps you build the habits that last beyond medication.
Start Free →Related calculators