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
Wegovy Weight Loss Reviews — What UK Users Should Know
Wegovy (semaglutide) is a prescription-only weekly weight loss injection licensed in the UK for adults with a BMI of 30 or above, or 27–29.9 with weight-related health conditions. Real-world results from clinical trials show an average weight loss of around 15% of body weight, though individual outcomes vary significantly. This guide explains what Wegovy weight loss reviews tell us, NHS eligibility criteria, how to access it through specialist services or privately, and what to expect from this GLP-1 medication in a UK context.
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.
Wegovy Weight Loss Results — NHS & STEP Trial Data
Clinical trials (STEP-1) showed that Wegovy helped participants lose an average of 14.9% of their body weight over 68 weeks — that's roughly 10–15 kg for many people, though results varied widely. Some achieved more, others less. Weight loss was achieved alongside a reduced-calorie diet and increased physical activity; Wegovy is not a standalone solution.
In the UK, a weekly weight loss injection like Wegovy works by activating GLP-1 receptors in the brain, reducing appetite and helping you feel fuller after smaller meals. Most users report decreased food cravings and less interest in eating within the first few weeks, though nausea is common initially.
- Dose escalation: starts at 0.25 mg, increases to maximum 2.4 mg over 16+ weeks
- Average loss per week: 0.2–0.5 kg on the maintenance dose
- Results plateau: weight loss typically slows after 12–18 months
- Stopping Wegovy: weight often returns if not sustained by lifestyle changes
Our free GLP-1 weight loss calculator can help you estimate potential outcomes at different doses based on current trial data.
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.
NHS vs Private Access for Wegovy in the UK
NHS route: Wegovy is available through tier 3 specialist weight management services following a GP referral. You'll be assessed by a multidisciplinary team (doctors, dietitians, psychologists). NHS access is free but availability varies by region, and waiting lists can be 6–18 months in some areas.
Private route: You can access a Wegovy prescription through UK-licensed prescribers via online consultations without an NHS referral. Prescriptions are dispensed by GPhC-registered pharmacies. Costs range from £129–£250 per month depending on your dose and provider.
Both routes require a clinical assessment. Your prescriber will check your eligibility, medical history, and suitability. Track your progress using our free progress tracker whether you're accessing Wegovy through NHS or private services.
- 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 available on the NHS in the UK?
Yes, Wegovy is available on the NHS through specialist tier 3 weight management services. You'll need a GP referral and assessment by a multidisciplinary team. Availability and waiting times vary significantly by region (ICB area). Some areas have substantial waiting lists; others have more capacity. Ask your GP about local services.
What is the average weight loss with Wegovy according to STEP trials?
The STEP-1 clinical trial showed an average weight loss of 14.9% of body weight (roughly 10–15 kg for many people) over 68 weeks on the maximum 2.4 mg dose. Results varied: some lost more, others less. Weight loss was achieved alongside a reduced-calorie diet and increased physical activity.
How does Wegovy compare to Mounjaro for weight loss?
Mounjaro (tirzepatide) is a dual GIP/GLP-1 agonist and achieved slightly higher average weight loss (15–21%) in SURMOUNT trials compared to Wegovy's 15% in STEP trials. However, both medications work similarly and results vary between individuals. Your prescriber will discuss which is more suitable for you.
What semaglutide weight loss side effects should I expect?
Common side effects include nausea, diarrhoea, constipation, and stomach pain — particularly when starting or increasing doses. Most side effects ease after 2–4 weeks. Serious but rare side effects include pancreatitis (severe stomach pain) and gallbladder problems. Always report persistent symptoms to your prescriber.
What Wegovy dose is most effective for weight loss?
The maximum dose (2.4 mg weekly) produced the greatest average weight loss in trials. However, doses are escalated gradually (0.25 mg → 2.4 mg over 16+ weeks) to minimise side effects. Your prescriber will adjust your dose based on tolerance and effectiveness. Higher doses aren't suitable for everyone.
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.