Understanding the BMI Criteria for Weight-Loss Injections
Both Mounjaro (tirzepatide) and Wegovy (semaglutide) are prescription-only medicines used alongside diet and increased activity. Prescribers typically consider two broad BMI bands when assessing eligibility, though criteria vary by healthcare system and individual clinical judgement:
- BMI of 30 or above — often the baseline threshold referenced in product guidance for both medicines
- BMI of 27 or above — may apply where the person also has at least one weight-related condition, such as type 2 diabetes, high blood pressure, or raised cholesterol
It is important to understand that BMI is one input among several. Your prescriber will also consider your medical history, any existing conditions, other medicines you take, and whether a GLP-1 medicine is appropriate for you specifically. A BMI figure alone does not confirm eligibility or guarantee a prescription.
BMI itself is calculated by dividing your weight in kilograms by the square of your height in metres. It is a screening tool with well-documented limitations — it does not account for muscle mass, fat distribution, age, or ethnicity — and health bodies increasingly use it alongside other measures. For a deeper look at how BMI is calculated and what it means on a GLP-1 journey, see the GLP Trackr calculator and tracking hub.
If you are researching BMI requirements for these medicines, you may also find these related guides useful: the BMI needed for Mounjaro and what your BMI needs to be for Mounjaro — both cover the clinical context in more detail.
According to NHS guidance, semaglutide (Wegovy) is indicated for adults with a BMI of at least 30, or at least 27 with a weight-related comorbidity. Tirzepatide (Mounjaro) follows similar prescribing criteria. Your own prescriber will confirm whether these apply to your situation.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
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Track Your BMI and Progress with GLP Trackr
Once you have been prescribed Mounjaro or Wegovy, your BMI at the start of treatment becomes a useful baseline — but it is rarely the most meaningful number to watch week to week. GLP Trackr's weight and body tracking feature lets you log your weight regularly and watch your trend unfold in clear charts, so you can see real movement over time rather than fixating on a single figure.
The daily morning check-in takes around 30 seconds: log your weight, mood, energy, and how your appetite feels that day. Over weeks, the app's insights surface patterns — how your sleep, protein intake, or hydration correlate with the numbers on the chart — giving you something genuinely useful to discuss at your next prescriber appointment.
If you want to understand how your calorie or protein targets fit into your journey, the GLP Trackr calculator hub is a good place to start. You can also explore more detail on the BMI requirements for Mounjaro if you are still in the early stages of understanding your eligibility.
GLP Trackr is a tracking and journaling companion — it does not prescribe, diagnose, or replace the advice of your healthcare professional. Any questions about whether your BMI meets the criteria for your specific prescription should be directed to your prescriber or doctor, who knows your full medical history.
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Morning Check-In
Start every day with a 60-second wellness check-in. Log how you're feeling, track nausea, appetite, energy, and mood — giving you and your care team a complete picture of how your medication is working.
Injection Tracking
Log every dose with a single tap. Track your dose history, phase in your cycle, estimated medication levels, and upcoming injection dates — with reminders so you never miss a scheduled shot.
Hydration Reminders
Staying hydrated is especially important on GLP-1 medications. Set daily water targets, log intake throughout the day, and receive smart nudges when you're falling behind your goal.
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Progress Analytics
Beautiful, easy-to-read charts show your weight loss trajectory, weekly nutrition trends, medication responses, and wellbeing scores over time — turning raw data into genuine insights.
AI Meal Scanning
Snap a photo of any meal and get a full nutrition breakdown in seconds — calories, protein, carbs, fat, and fibre. No searching. No manual logging. Just point, snap, and track.
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Log walks, workouts, and movement with activity targets that flex with your energy levels. On lower-energy dose days, gentler targets keep you moving without burning out.
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Frequently asked questions.
Mounjaro is typically prescribed to adults with a BMI of 30 or above, or 27 or above if a weight-related condition such as type 2 diabetes or high blood pressure is present. Your prescriber makes the final decision based on your full health picture, not BMI alone.
Wegovy (semaglutide) is generally indicated for adults with a BMI of at least 30, or at least 27 alongside a weight-related comorbidity. As with all prescription medicines, eligibility is confirmed by your prescriber or doctor after a clinical assessment.
No. BMI is one criterion among several. Prescribers also consider your medical history, existing health conditions, other medicines you take, and overall suitability. Meeting a BMI threshold does not automatically guarantee a prescription.
GLP Trackr is a tracking and journaling app for people already prescribed these medicines — it does not assess eligibility or provide medical advice. To find out whether you qualify, speak with your prescriber or doctor.
GLP Trackr lets you log your weight regularly and view trends over time in clear charts. The daily check-in captures weight alongside mood, energy, and appetite, giving you a fuller picture of your journey to discuss with your prescriber.