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 is the Wegovy equivalent to 10mg Mounjaro?
If you're comparing Mounjaro and Wegovy for weight management in the UK, understanding dose equivalence is important — though there's no official conversion chart. A 10mg Mounjaro dose is approximately equivalent to around 1.7mg Wegovy, based on clinical practice guidance and the mechanisms of each medication. However, prescribers assess each patient individually, and what works best depends on your personal health profile, not just dose matching. Both are prescription-only injections requiring clinical assessment before being prescribed through NHS specialist services or private online pharmacies.
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.
How do 10mg Mounjaro and Wegovy differ in mechanism and trial results?
The key difference between these medications explains why direct dose comparison is tricky. Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist — meaning it activates two natural hormone pathways simultaneously. Wegovy (semaglutide) is a GLP-1-only agonist, activating a single pathway. This dual mechanism may explain why Mounjaro users in the SURMOUNT clinical trials achieved slightly higher average weight loss (around 20.9% body weight at the maximum 15mg dose over 72 weeks) compared to Wegovy users in the STEP trials (approximately clinically studied weight loss at 2.4mg maximum dose over 68 weeks). However, individual results vary significantly — the right medication depends on your personal response, side effect tolerance, and clinical suitability, not just average trial data. Your prescriber will assess which is appropriate for you following a clinical evaluation.
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.
Which medication is right for you — and how do prescribers decide?
There's no universal rule about which medication "works better" at equivalent doses — both are effective for weight management in eligible adults. A 10mg Mounjaro kwikpen dose and a 1.7mg Wegovy dose represent approximate equivalence based on potency, but your prescriber may recommend either based on: your medical history, current medications (especially oral contraceptives or diabetes medicines), tolerance to gastrointestinal side effects, and previous response to similar medications. Both require a UK prescription and clinical assessment. Mounjaro nhs nice guidelines support tirzepatide in specialist weight management services, as do Wegovy guidelines. If you're interested in either medication, discuss with your GP about NHS referral to tier 3 specialist services, or consult a licensed prescriber through private online services. Try our GLP-1 weight loss calculator above to explore potential weight loss projections at different doses.
- 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 10mg Mounjaro the same as 1.7mg Wegovy?
Approximately, yes — based on clinical practice. However, this is an estimated equivalence, not an official conversion. The dual mechanism of Mounjaro means exact equivalence is difficult to establish. Your prescriber will determine the right dose and medication for your individual needs, not based on dose matching alone.
Which causes fewer side effects — 10mg Mounjaro or Wegovy?
Both can cause nausea, diarrhoea, and constipation — especially during dose escalation. Individual tolerance varies significantly. Some people tolerate Mounjaro better; others prefer Wegovy. Your prescriber will consider your medical history and side effect concerns when choosing between them.
Can I switch from 10mg Mounjaro to Wegovy?
Yes, switching is possible but must be managed by your prescriber. There's no standard protocol — your doctor will assess the safest transition approach based on your response to Mounjaro, any side effects experienced, and your health profile. Never self-switch between medications.
How long does it take to reach 10mg Mounjaro or equivalent Wegovy dose?
Mounjaro escalates over 16+ weeks (starting at 2.5mg, increasing weekly). Wegovy escalates over 16+ weeks (starting at 0.25mg). Slower escalation reduces side effects but delays reaching higher therapeutic doses. Prescribers follow evidence-based titration schedules.
Will I lose more weight on 10mg Mounjaro than Wegovy?
Clinical trials suggest Mounjaro users achieved slightly higher average weight loss overall, but individual results vary widely. Some people lose more on Wegovy; others respond better to Mounjaro. Weight loss depends on adherence, diet, activity level, and individual metabolism — not dose equivalence alone. Use our GLP-1 weight loss calculator to explore projections.
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.