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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10mg Mounjaro and Wegovy: UK Equivalence and Cost
At a 10mg dose, Mounjaro (tirzepatide) is roughly equivalent to 1.7mg Wegovy (semaglutide) in terms of clinical effect, though there are important differences between them. Both are prescription-only weight management injections licensed in the UK, and both can be accessed through NHS specialist services or private online prescribers following a clinical assessment. This guide explains the approximate equivalence, how costs compare, and the practical steps to access either medication in the UK.
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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.
Understanding the 10mg Mounjaro to Wegovy Conversion
Approximate equivalence: A 10mg dose of Mounjaro (tirzepatide) is broadly comparable to 1.7mg Wegovy (semaglutide) based on clinical trial data and prescribing practice. However, this is not an official conversion chart — the two medications work through different mechanisms, so direct dose comparison does not reflect identical outcomes.
- Mounjaro is a dual GIP and GLP-1 receptor agonist — it activates two hormone pathways simultaneously
- Wegovy is a GLP-1-only agonist — it activates one pathway
In the SURMOUNT trial, Mounjaro at 10mg produced average weight loss of approximately 19.5% of body weight over 72 weeks. Wegovy at 2.4mg (the maximum dose) showed average weight loss of around 14.9% in the STEP trials. This suggests Mounjaro may have a slightly greater effect at equivalent doses, though individual results vary significantly. Any switch between these medications must be managed by your prescriber — never change doses or switch medications without clinical guidance.
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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.
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Cost and Access: NHS vs Private in the UK
NHS access: Both Mounjaro and Wegovy are available through NHS specialist weight management services (tier 3), but availability and waiting times vary significantly by region. You'll need a GP referral and assessment by a specialist team. Many areas have substantial waiting lists — sometimes 6–12 months or longer.
Private access: Both medications are available through GPhC-registered online pharmacies following an online consultation with a UK-licensed prescriber. Private costs typically range from £129–£320 per month depending on the dose, provider, and formulation. You can use our GLP-1 weight loss calculator above to explore potential outcomes at different doses, which may help inform your consultation.
Getting started: Whether NHS or private, you'll need an initial consultation where a prescriber assesses your BMI, health conditions, and medication history. Both routes require prescription — these are not over-the-counter medicines.
- 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.
What is the exact Mounjaro to Wegovy dose equivalent?
There is no official conversion chart. Approximately: 5mg Mounjaro ≈ 0.5mg Wegovy, 10mg Mounjaro ≈ 1.7mg Wegovy, 15mg Mounjaro ≈ 2.4mg Wegovy. These are clinical approximations only — actual equivalence depends on individual response and mechanism differences. Always let your prescriber manage any dose changes.
Is Mounjaro or Wegovy cheaper in the UK?
Private costs are similar (£129–£320/month depending on dose and provider). NHS access is free but requires referral and often has long waiting lists. Costs vary by private provider — always check current pricing. Your GP can advise on NHS eligibility and local specialist service availability.
Can I switch from Mounjaro to Wegovy or vice versa?
Yes, but only with prescriber guidance. A switch requires a clinical assessment because the medications have different mechanisms (Mounjaro is dual GIP+GLP-1, Wegovy is GLP-1 only). Your prescriber will manage the transition, including any dosing adjustments. Never self-switch between medications.
How long does it take to access these medications on the NHS?
Waiting times vary dramatically by region (NHS integrated care board). Some areas have waiting lists of 6–12 months or longer. Private online prescribers typically provide faster access — usually within 1–2 weeks of consultation. Contact your GP to find out the waiting time in your area.
Do I need a clinical assessment before starting either medication?
Yes. Both Mounjaro and Wegovy are prescription-only and require an assessment by a licensed prescriber (GP, specialist, or registered online prescriber). The assessment checks your BMI, health conditions, medications, and eligibility. You cannot access either medication without this assessment, whether through NHS or private routes.
Ready to take control of your weight loss journey?
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