The UK's most complete GLP-1 guide
Every Question Answered. Every Side Effect Explained.
- How GLP-1 medications work
- Mounjaro vs Wegovy compared
- Injection instructions
- Side effects & solutions
- What to eat on treatment
- FAQs answered
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What's the Wegovy Equivalent to Mounjaro 7.5mg?
If you're comparing Wegovy and Mounjaro 7.5mg, you may be wondering whether these doses are equivalent. Mounjaro 7.5mg is approximately equivalent to Wegovy 1.7mg, though this is an estimate rather than an official conversion. Both are prescription-only weight management injections licensed in the UK, but they work differently and individual responses vary significantly. This guide explains the approximate equivalence, why they differ, and how your prescriber decides which is right for you.
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Enter your height and weight below. Supports both imperial (stone & lbs) and metric (kg). Results include NHS category, healthy weight range, and ethnicity adjustments.
What Is BMI and Why Does It Matter?
Body Mass Index (BMI) is the most widely used screening tool for assessing whether your weight falls within a healthy range. Used by the NHS, GPs, and weight management services across the UK, BMI provides a quick snapshot of your weight relative to your height. The formula is simple: your weight in kilograms divided by your height in metres squared (kg/m²).
While BMI isn't a perfect measure — it doesn't account for muscle mass, bone density, or fat distribution — it remains the standard first step in identifying potential weight-related health risks including type 2 diabetes, cardiovascular disease, high blood pressure, and certain cancers.
The NHS also recommends adjusted thresholds for people of South Asian, Chinese, or Black African heritage — a BMI of 23 or above is classified as overweight, and 27.5 as obese. Our calculator includes this adjustment as a one-click toggle.
How Do Mounjaro 7.5mg and Wegovy Compare?
Mounjaro 7.5mg is a mid-range dose in the Mounjaro titration schedule (starting at 2.5mg and escalating weekly). Wegovy 1.7mg is similarly positioned in its escalation pathway (starting 0.25mg, reaching 1.7mg by week 13). Clinical data suggests these doses produce comparable weight loss outcomes, with both potentially supporting 15–17% body weight reduction when combined with diet and exercise changes.
However, there is no official NHS-approved conversion chart between Mounjaro and Wegovy. The approximate equivalence is based on clinical practice patterns, not direct conversion formulas. The key difference lies in their mechanisms: Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist, whilst Wegovy (semaglutide) is a GLP-1 agonist only. This dual action may contribute to slightly different appetite suppression and metabolic effects, meaning equivalent doses may not produce identical results for every person.
- Mounjaro: Once-weekly injection, doses 2.5–15mg
- Wegovy: Once-weekly injection, doses 0.25–2.4mg
- Approximate Mounjaro 7.5mg equivalent: Wegovy 1.7mg (clinical estimate only)
- Individual responses vary based on metabolism, genetics, and lifestyle
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How It Works
Three simple steps to understand your weight and take action.
Enter your height and weight in our free calculator. Get your BMI, NHS category, healthy weight range, and ethnicity-adjusted thresholds instantly.
If your BMI suggests you're overweight or obese, explore our GLP-1 calculators to project potential weight loss on Mounjaro or Wegovy.
Use our progress tracker to log your weight weekly, visualise your journey with charts, and stay motivated — all stored privately in your browser.
Free Weight Loss Tools & Guides
Everything you need to understand your weight, explore medication options, and track your progress — completely free.
Choosing Between Them — What Your Prescriber Considers
Your prescriber will assess your individual health profile rather than base the choice on dose equivalence alone. Factors include your medical history, current medications, side effect tolerance, and whether you're starting fresh or switching from another medication. If you're already on one medication, switching to the other is possible but requires prescriber guidance and a planned transition—you would not simply move from Mounjaro 7.5mg directly to Wegovy 1.7mg without clinical review.
Both medications require a clinical assessment before prescription. Use our free GLP-1 weight loss calculator to project potential weight loss outcomes at different doses, and our BMI calculator to understand your current health context. Your prescriber will make the final recommendation based on your eligibility, health goals, and suitability—both drugs are effective, and the "best" choice is the one appropriate for you personally.
---COL_J_TOOLS--- GLP-1 weight loss calculator, BMI calculator- Dual GIP/GLP-1 receptor agonist
- Up to 22.5% body weight loss (SURMOUNT-1)
- Weekly injection, dose escalation over 20+ weeks
- Available via private prescription in the UK
- Doses: 2.5mg → 5mg → 7.5mg → 10mg → 12.5mg → 15mg
- GLP-1 receptor agonist
- Up to 15–17% body weight loss (STEP trials)
- Weekly injection, 5-step dose escalation
- NHS & private prescription available
- Doses: 0.25mg → 0.5mg → 1mg → 1.7mg → 2.4mg
Mounjaro vs Wegovy: Head-to-Head
A side-by-side comparison of the two most popular GLP-1 weight loss medications available in the UK.
| Feature | Mounjaro | Wegovy |
|---|---|---|
| Drug class | Dual GIP/GLP-1 agonist | GLP-1 agonist |
| Active ingredient | Tirzepatide | Semaglutide |
| Avg. weight loss | 15–22.5% | 12–17% |
| Key trial | SURMOUNT-1 (2022) | STEP 1 (2021) |
| Max dose | 15 mg weekly | 2.4 mg weekly |
| Escalation period | 20–32 weeks | 16–20 weeks |
| Administration | Weekly injection (pen) | Weekly injection (pen) |
| NHS availability | Private prescription only | NHS & private |
| Approx. private cost | £150–£250/month | £150–£300/month |
| Common side effects | Nausea, diarrhoea, constipation | Nausea, vomiting, diarrhoea |
Data sourced from SURMOUNT-1 and STEP 1 clinical trials. Costs are approximate and vary by provider. Always consult a prescriber.
Am I Eligible for Weight Loss Medication?
In the UK, eligibility for GLP-1 weight loss medications like Mounjaro and Wegovy is based on your BMI and overall health profile.
- BMI of 30 or above (obese)
- Age 18 or over
- No contraindicated conditions
- Committed to lifestyle changes
- BMI of 27 or above
- Plus type 2 diabetes
- Or high blood pressure
- Or obstructive sleep apnoea
Use our BMI calculator to check whether your BMI falls within the eligible range.
How We Built These Tools
Every calculator and guide on myweightcheck is built with accuracy and transparency in mind. Our BMI calculator uses the standard WHO formula with NHS-aligned category thresholds. Our GLP-1 projections are modelled on published clinical trial data from SURMOUNT and STEP studies.
All data stays on your device. We don't require sign-ups, and we don't store your health information on any server. Your progress tracker saves data locally in your browser using localStorage, so only you can see it.
We're based in the UK and our tools are designed specifically for UK users — supporting stone & lbs by default, referencing NHS guidelines, using NICE-approved medication data, and linking to GPhC-registered pharmacies.
Frequently Asked Questions
Common questions about BMI, weight loss medications, and our free UK tools.
Is Mounjaro 7.5mg exactly the same as Wegovy 1.7mg?
No. Whilst these doses are approximately equivalent in terms of typical weight loss outcomes, there is no official conversion formula. Mounjaro uses a dual GIP+GLP-1 mechanism, whilst Wegovy uses GLP-1 only. Individual results depend on your metabolism, lifestyle, and how your body responds to each drug's specific mechanism.
Can I switch from Mounjaro 7.5mg to Wegovy 1.7mg?
Yes, switching is possible, but you must consult your prescriber first. Any medication switch requires a planned approach and clinical review. Your prescriber will assess whether switching is appropriate and how to transition safely. Do not change doses or medications without guidance.
Which medication causes more weight loss?
Clinical trial data shows both support similar average weight loss (14–21% body weight). Mounjaro's dual mechanism may produce slightly greater average loss in some studies, but individual results vary widely. Your personal outcome depends on adherence, diet, exercise, and how your body responds—not just the medication.
Will my weight loss be the same on both drugs?
No. Even at approximate dose equivalents, weight loss varies between individuals and between the two medications. Factors include your starting weight, metabolism, lifestyle changes, and medication adherence. Your prescriber will discuss realistic expectations based on clinical trial data, not assured outcomes.
How do I know which medication is right for me?
Your prescriber will assess your medical history, eligibility, current medications, and preferences. Both are prescription-only and require a clinical assessment. Discuss your health goals, any previous medication experiences, and any concerns with your prescriber—they will recommend the most suitable option for your individual circumstances.
Ready to take control of your weight loss journey?
Start with a free BMI check, explore your GLP-1 options, or begin tracking your progress today. No sign-up. No cost. Just results.