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
Free tracker included with every download this week
What's the Wegovy Equivalent to 10mg Mounjaro?
If you're taking 10mg Mounjaro (tirzepatide) and wondering about the Wegovy (semaglutide) equivalent, the approximate dose comparison is 1.7mg of Wegovy. However, these are different medications with different mechanisms of action, and any switch between them must be managed by your prescriber. Both are prescription-only weight management injections licensed in the UK, though individual responses vary significantly. This guide explains the approximate equivalence and key differences between these GLP-1 and dual GIP/GLP-1 medications.
10,000+ calculations today · NHS-aligned thresholds · 100% free
Calculate Your BMI Instantly
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.
Mounjaro vs Wegovy — Dose Comparison
Mounjaro (tirzepatide) and Wegovy (semaglutide) are both once-weekly weight management injections available in the UK, but they work through different hormone pathways. Mounjaro is a dual GIP and GLP-1 receptor agonist, meaning it activates two natural appetite-regulating pathways, whilst Wegovy is a GLP-1 agonist only, targeting a single pathway.
The approximate dose equivalence is:
- 10mg Mounjaro ≈ 1.7mg Wegovy
- 5mg Mounjaro ≈ 0.5mg Wegovy
- 15mg Mounjaro ≈ 2.4mg Wegovy (maximum)
These are clinical practice approximations only — there is no official established conversion chart. Individual responses to each medication differ, and switching between them requires a prescriber's assessment. Your GP or the prescriber managing your weight will decide whether a switch is appropriate based on your personal health profile, tolerance, and treatment goals.
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
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.
Clinical Data and Individual Variation
In clinical trials, Mounjaro at 10mg helped participants lose an average of approximately 19.5% of their body weight over 72 weeks (SURMOUNT-1 trial), whilst Wegovy at its maximum dose of 2.4mg achieved approximately 14.9% average weight loss over 68 weeks (STEP-1 trial). These results were achieved alongside a reduced-calorie diet and increased physical activity — weight loss is not assured, and individual outcomes vary substantially.
The dual mechanism of Mounjaro may be more effective for some people, but Wegovy may be equally suitable for others. Only your prescriber can advise which medication aligns with your health needs and treatment response. Use our free GLP-1 weight loss calculator to understand potential weight loss projections at different doses of either medication.
- 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.
Can I switch from 10mg Mounjaro to Wegovy?
Potentially, yes — but only under prescriber supervision. Your GP or weight management specialist will assess whether switching is clinically appropriate for you, considering your tolerance, side effects, and individual response. Never stop or switch medications without medical guidance. The switch should be managed carefully to ensure continuity of treatment.
Will I lose the same amount of weight on Wegovy as Mounjaro?
No — individual responses vary significantly between medications and between people. Clinical trials show Mounjaro may have a slight advantage due to its dual mechanism, but many people achieve excellent results on Wegovy. Your prescriber will discuss expected outcomes based on your personal health profile and previous medication response.
Is 1.7mg Wegovy exactly the same as 10mg Mounjaro?
No — it's an approximate clinical equivalence only. The medications have different mechanisms, different trial data, and different side effect profiles. This is why any switch must involve a prescriber assessment rather than a simple dose swap. You cannot treat these as true interchangeable equivalents.
Why is Mounjaro sometimes more effective than Wegovy?
Mounjaro's dual GIP and GLP-1 mechanism activates two appetite pathways, whilst Wegovy targets GLP-1 only. This dual action may offer additional benefits for some patients, but it's not universally more effective — response depends on individual metabolism, genetics, and other health factors.
How long does it take to see results on Wegovy after switching from Mounjaro?
Weight loss typically becomes noticeable after 4–8 weeks on Wegovy, though this varies. Your prescriber will monitor your progress and may adjust your dose gradually. Because Wegovy requires slower dose titration than Mounjaro, the overall transition period may take several weeks. Keep track of changes using our free progress tracker.
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.