Based on the STEP-1 trial (semaglutide 2.4mg, ~68 weeks) and the SURMOUNT-1 trial (tirzepatide 15mg, ~72 weeks), this calculator applies each drug's average percentage weight loss to your current weight. Trial averages vary widely between individuals — use this as a directional estimate, not a promise.
Weight-loss projection
Frequently asked questions
How much weight can I lose on semaglutide?
The STEP-1 clinical trial found an average weight loss of approximately 15% of body weight over 68 weeks on semaglutide 2.4mg. Individual results vary. This is an educational estimate, not a guarantee — speak to your clinician.
How much weight can I lose on tirzepatide?
The SURMOUNT-1 trial found an average weight loss of approximately 20% of body weight over 72 weeks on tirzepatide 15mg. Individual results vary. Speak to your clinician for personalised guidance.
Are these calculators medically accurate?
They apply published clinical-trial averages. Every individual is different — age, sex, starting weight, dose, adherence, diet, and activity level all influence real-world outcomes. Use the numbers as useful context, not a forecast.