How Much Weight Can You Lose on Mounjaro?
A realistic look at expected weight loss on Mounjaro (tirzepatide), based on clinical trial data and practical planning advice.
Try the Mounjaro Weight Loss Calculator
What the clinical trials show
The SURMOUNT-1 trial found that adults taking the highest dose of tirzepatide (15 mg) lost an average of 22.5% of their body weight over 72 weeks. At the 10 mg dose, average loss was about 19.5%, and at 5 mg, about 15%.
For a person starting at 100 kg, that could mean losing 15–22.5 kg over roughly 18 months — though individual results vary significantly.
What affects how much you lose
- Starting weight: People with more weight to lose tend to lose more in absolute terms
- Dose: Higher doses are associated with greater average weight loss in trials
- Diet and exercise: Medication works alongside lifestyle changes, not instead of them
- Adherence: Consistent use is important — missing doses reduces effectiveness
- Individual variation: Some people respond more strongly than others
Realistic expectations
Weight loss is not linear. Most people lose weight quickly in the first few months, then the rate slows. Plateaus are normal. It is also common to experience faster loss when moving to a higher dose.
A conservative planning estimate is 0.5% of body weight per week; an ambitious estimate is 1% per week. Most people fall somewhere in between.
Try the calculator
Use our Mounjaro Weight Loss Calculator to see a personalised projection based on your starting weight, timeframe, and chosen scenario.
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Related guides
- How Many Calories Should You Eat on Mounjaro? — Understanding your calorie needs during Mounjaro treatment — maintenance, deficit, and safe intake ranges explained.
- How Much Protein Should You Eat on Mounjaro? — Why protein matters during GLP-1 weight loss and how to hit your daily target with practical meal guidance.
- Mounjaro vs Wegovy for Weight Loss — A balanced comparison of Mounjaro (tirzepatide) and Wegovy (semaglutide) — mechanism, effectiveness, cost, and side effects.
- What BMI Means for Weight-Loss Injections — How BMI is used to assess eligibility for weight-loss medications like Mounjaro and Wegovy, and its limitations.
Last updated
Last reviewed: 2026-04-12T10:29:26.079Z.