Understanding BMI Thresholds in the Context of Mounjaro
BMI, or Body Mass Index, is a widely used screening measure calculated from a person's weight and height. In clinical practice, it is one of several factors a prescriber considers when evaluating eligibility for weight-management medicines like Mounjaro.
Commonly referenced BMI criteria
Based on product information aligned with the electronic Medicines Compendium (eMC), Mounjaro is indicated for weight management in adults with an initial BMI of:
- 30 kg/m² or above (classified as obesity)
- 27 kg/m² or above when at least one weight-related comorbidity is present — for example, type 2 diabetes, high blood pressure, or dyslipidaemia
These thresholds reflect the licensed indication, but individual prescribers may apply additional clinical criteria depending on their patient's full health picture. A BMI at or above these values does not automatically mean the medicine will be prescribed — suitability is always an individual clinical judgement.
Why BMI alone doesn't tell the whole story
BMI is a useful starting point, but it has well-recognised limitations. It doesn't account for muscle mass, fat distribution, ethnicity-related risk differences, or other health factors that a prescriber will weigh up. Some clinical guidelines also reference adjusted BMI thresholds for certain ethnic groups. Your prescriber or doctor is best placed to interpret your BMI in context and decide whether Mounjaro is appropriate for you.
If you want to explore how BMI is calculated and what it means on a GLP-1 journey, see our pages on BMI and Mounjaro eligibility, what your BMI means on Mounjaro, and which BMI qualifies for Mounjaro for further context.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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Tracking Your BMI and Progress with GLP Trackr
Once you are prescribed Mounjaro and begin your journey, watching how your weight and body measurements change over time is where GLP Trackr becomes genuinely useful. The app's weight and body tracking feature lets you log your weight regularly and see your progress as clear charts — so you can observe trends week by week rather than fixating on single readings.
Because BMI shifts as your weight changes, logging consistently means you always have an up-to-date picture to bring to your prescriber appointments. The app's insights and analytics go a step further, surfacing patterns in your data — such as how your results relate to protein intake, sleep, or activity — giving you meaningful context beyond the number on the scale.
For a broader look at calorie targets, protein goals, and the other numbers that matter on a GLP-1 journey, visit our GLP-1 calculator hub.
GLP Trackr is a tracking companion — it does not replace the clinical assessment your prescriber carries out, and any questions about your eligibility, dose, or progress with Mounjaro should always be discussed with your healthcare professional.
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Frequently asked questions.
Mounjaro is generally indicated for adults with a BMI of 30 or above, or 27 or above if a weight-related health condition such as type 2 diabetes or high blood pressure is present. Eligibility is always determined by a prescriber based on your full clinical picture.
Not automatically. A BMI at or above the threshold is one factor in the assessment, but prescribers consider your overall health, medical history, and any contraindications. The decision is an individual clinical judgement made by your prescriber or doctor.
No. BMI is a starting point, but prescribers also consider weight-related health conditions, medical history, and other individual factors. Some guidelines also reference adjusted thresholds for certain ethnic groups. Your prescriber is best placed to assess your situation.
BMI is calculated by dividing your weight in kilograms by the square of your height in metres (kg/m²). For example, a weight of 90 kg and a height of 1.75 m gives a BMI of approximately 29.4. Online calculators can do this quickly, but interpretation is best done with your healthcare professional.
GLP Trackr lets you log your weight regularly and view progress charts, giving you a clear picture of how your measurements change over your journey. You can use this data to have informed conversations with your prescriber about your progress.