What BMI Means for Mounjaro and Wegovy Users
BMI is a simple calculation: your weight in kilograms divided by your height in metres squared (kg/m²). It is widely used as a screening tool, though prescribers also consider other factors — such as weight-related health conditions — when deciding whether a GLP-1 medicine is appropriate for a given person.
BMI thresholds commonly referenced
Prescribing criteria for Mounjaro and Wegovy are set by regulatory authorities and individual healthcare systems, and they can vary by country and clinical context. In many settings, a BMI of 30 or above, or a BMI of 27 or above alongside at least one weight-related condition, is the general threshold discussed for these medicines. For a detailed look at how those criteria are typically applied, see our guide to Mounjaro BMI criteria explained.
If you are curious about the specific figure that applied when you were prescribed your medicine, your prescriber or doctor is the right person to ask — criteria differ, and what mattered at the point of prescription may not be the same as what guides your ongoing care.
Why your BMI changes as you progress
As your weight shifts during treatment, your BMI moves with it. Tracking that change over time gives you and your prescriber a concrete picture of how the journey is going. Some people focus so heavily on the scale number that they miss the broader trend — BMI puts your weight in context relative to your height, which can be a more meaningful metric to bring to a clinical review.
For more on how BMI interacts with prescribing decisions, you may find it helpful to read about BMI and Mounjaro treatment, or explore the specific question of Mounjaro at a BMI of 27 if that threshold is relevant to your situation. There is also a dedicated page on what happens if BMI drops during treatment, which addresses a question many people have as they progress.
average weekly weight change in the first 16 weeks of Mounjaro & Wegovy use*
Tracking the right four numbers — weight, waist, protein and dose — turns a noisy chart into a clear story. That's the loop GLP-1 users keep coming back for.
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Tracking Your BMI and Weight Progress with GLP Trackr
GLP Trackr's weight and body tracking feature is the most relevant tool here — log your weight regularly and the app builds a chart of your trend over time, making it straightforward to see how your BMI is shifting week by week. Because BMI is derived from a fixed height and a changing weight, every weigh-in you record moves the needle, and watching that trend is often more motivating than any single reading.
Alongside weight, the daily check-in lets you capture mood, energy, and food-noise levels in about 30 seconds — so your progress record covers more than just the number on the scale. When you bring that data to a prescriber appointment, you arrive with a fuller picture rather than relying on memory.
For a broader look at the calculation tools available to support your journey, visit our GLP-1 calculator hub, where you will find resources covering calories, protein targets, and more.
Ready to start logging? Download GLP Trackr on the App Store or Google Play — your first 7 days are completely free, no commitment needed.
GLP Trackr records and displays your data to support self-tracking; it does not provide medical advice. Any questions about your BMI, your treatment, or your progress targets should be directed to your prescriber or doctor, who can assess your full history.
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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.
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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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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.
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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.
In many clinical settings, a BMI of 30 or above — or 27 or above alongside a weight-related health condition — is commonly referenced. Criteria vary by country and prescriber, so your doctor is the best person to clarify what applied in your case.
Ongoing treatment decisions are made by your prescriber, who considers your full clinical picture — not BMI alone. If your BMI has changed significantly during treatment, discuss what that means for your care plan directly with your healthcare professional.
Divide your weight in kilograms by your height in metres squared (kg/m²). For example, 85 kg divided by 1.75 m² gives a BMI of approximately 27.8. Many online calculators can do this automatically once you enter your measurements.
No. Prescribers also consider weight-related conditions such as type 2 diabetes, high blood pressure, or sleep apnoea, as well as your overall health history. BMI is one screening tool among several, and eligibility decisions rest with your prescriber.
GLP Trackr's weight-tracking feature logs each weigh-in and displays your trend in a chart. Since BMI changes as your weight changes, consistent logging gives you a clear picture of progress to review with your prescriber.