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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Wegovy Weight Loss Price and How It Compares to Mounjaro
Wegovy (semaglutide) is a prescription-only, once-weekly weight loss injection licensed in the UK. If you're considering a weekly weight loss injection for weight management, understanding both the cost and how Wegovy compares to Mounjaro can help you make an informed decision. This guide explains Wegovy pricing in the UK, compares its mechanism and clinical results against Mounjaro, and clarifies what affects eligibility and prescription costs. Both medications require a clinical assessment before being prescribed.
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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.
Wegovy vs Mounjaro: Mechanism, Doses, and Clinical Results
Wegovy (semaglutide) is a single GLP-1 receptor agonist — it activates one hormone pathway to reduce appetite and support feeling fuller after smaller meals. Mounjaro (tirzepatide) is a dual GIP and GLP-1 agonist — it activates two pathways, which may explain why clinical trials showed higher average weight loss.
Clinical trial data shows the difference in outcomes. In the STEP-1 trial, Wegovy at its maximum dose (2.4 mg) helped participants lose an average of approximately 14.9% of body weight over 68 weeks alongside diet and exercise. The SURMOUNT-1 trial for Mounjaro showed average weight loss of 20.9% at the maximum dose (15 mg) over 72 weeks — though individual results vary significantly.
- Wegovy doses: Start at 0.25 mg, escalate weekly to maximum 2.4 mg
- Mounjaro doses: Start at 2.5 mg, escalate weekly to maximum 15 mg
- Both: Once-weekly injections; results depend on diet, exercise, and individual metabolism
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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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Wegovy UK Pricing and NHS Access
Private Wegovy costs in the UK typically range from £130 to £220 per month depending on dose and provider, with higher doses costing more. NHS access is available through specialist tier 3 weight management services, though regional availability varies significantly and waiting lists can be lengthy. Our GLP-1 weight loss calculator can help you estimate potential results at different doses, which may inform discussions with your prescriber about cost versus expected outcome.
Semaglutide weight loss prescription pricing varies between providers — some offer dose-based pricing, others use a flat rate. Always check what's included: some providers include clinical follow-up appointments, others charge separately. Your GP can refer you to NHS specialist services if you meet eligibility criteria (BMI ≥30, or ≥27 with weight-related health conditions). A licensed prescriber will assess your individual suitability during an online or in-person consultation.
- 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 Wegovy cheaper than Mounjaro in the UK?
Private pricing is similar — both typically cost £130–£220/month depending on dose. Mounjaro may cost slightly more at higher doses. NHS access depends on your local specialist weight management service availability. Direct price comparison depends on your specific dose and provider, so always request quotes from multiple clinics before deciding.
What's the difference between Wegovy and Mounjaro for weight loss?
Wegovy is a single GLP-1 agonist; Mounjaro is a dual GIP+GLP-1 agonist. Clinical trials showed Mounjaro achieved higher average weight loss (20.9% vs 14.9%), though both require diet and exercise. Individual results vary. A prescriber will assess which suits your health profile best.
Can I get Wegovy on the NHS in the UK?
Wegovy is available through NHS specialist tier 3 weight management services if you meet eligibility criteria and are referred by your GP. Availability varies by region, and waiting lists can be several months. Private prescription is available without NHS referral if you meet clinical assessment criteria.
How much does a Wegovy injection cost per week?
Weekly cost depends on dose. At private providers, a weekly injection costs roughly £30–£55 depending on your dose level. Starting doses (0.25–0.5 mg) are cheaper; maintenance doses (1.7–2.4 mg) are more expensive. NHS prescriptions have no direct cost if dispensed through the NHS.
Which is better for weight loss — Wegovy or Mounjaro?
Both are effective; "better" depends on individual factors. Mounjaro showed higher average weight loss in trials, but Wegovy has established long-term safety data. A licensed prescriber will assess your health, medications, and preferences to recommend the most suitable option for you.
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.