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 in the UK
Wegovy (semaglutide) is a prescription-only, once-weekly weight loss injection available in the UK through both NHS specialist services and private prescribing routes. The cost and availability differ significantly depending on whether you access it through the NHS or privately. This guide explains NHS eligibility criteria, NICE guidance, private pricing, and how to determine which route is right for you. Our GLP-1 weight loss calculator can help you explore potential outcomes with semaglutide treatment.
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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.
NHS Access, NICE Guidance, and Eligibility
NHS access to Wegovy (semaglutide) is limited and typically free at the point of use for eligible patients. NICE (the National Institute for Health and Care Excellence) has approved semaglutide for weight management within NHS specialist tier 3 weight management services. However, access is not available through standard GP prescription — you must be referred to a specialist multidisciplinary weight management service.
- You may be eligible for NHS Wegovy if you have a BMI of 30 or above, or a BMI of 27–29.9 with weight-related health conditions (type 2 diabetes, hypertension, dyslipidaemia, sleep apnoea, or cardiovascular disease)
- Lower thresholds apply for adults of South Asian, Chinese, Black African, or Black Caribbean heritage (BMI 27.5+)
- Clinical trials (STEP-1) showed average weight loss of approximately 15% body weight over 68 weeks alongside a reduced-calorie diet and physical activity
- NHS availability varies significantly by region — some ICBs have active programmes, others have very long waiting lists or limited access
- You must be referred by your GP to tier 3 services; waiting times can be several months to over a year in many areas
Check with your local NHS integrated care board (ICB) for current Wegovy availability and waiting times in your area.
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.
Private Wegovy: Cost, Access, and How It Works
Private access to Wegovy is faster and does not require an NHS referral. Private prescribing through UK-licensed online pharmacies typically costs between £129–£250 per month depending on the dose and provider. This includes the clinical assessment, prescription, and dispensing.
- Private Wegovy access does not require referral to NHS services
- You complete an online health questionnaire assessed by a UK-licensed prescriber
- If approved, a prescription is issued and dispensed by a GPhC-registered pharmacy
- Starting dose (0.25 mg) typically costs less than maintenance doses (1.7–2.4 mg)
- Treatment includes ongoing prescriber support and dose escalation guidance
- Private costs are not covered by NHS or standard health insurance — you pay out of pocket
Use our free GLP-1 weight loss calculator to estimate potential outcomes and understand the investment involved in a full treatment course.
- 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.
How much does Wegovy cost on the NHS?
Wegovy is free on the NHS if prescribed through a specialist tier 3 weight management service. However, NHS access is strictly limited to eligible patients and typically requires referral from your GP followed by assessment by a multidisciplinary team. Availability and waiting times vary significantly by region. Many areas have long waiting lists or restricted access.
What is the private cost of Wegovy in the UK?
Private Wegovy typically costs £129–£250 per month depending on the dose. Starting doses (0.25 mg) are usually less expensive than maintenance doses (1.7–2.4 mg). This fee covers the clinical assessment, prescription, and dispensing through a GPhC-registered pharmacy. A full 12-month course at maintenance dose could cost approximately £1,500–£3,000.
Am I eligible for NHS Wegovy?
You may be eligible for NHS Wegovy if you have a BMI of 30 or above, or 27–29.9 with weight-related health conditions (diabetes, hypertension, sleep apnoea, or heart disease). Lower thresholds apply for South Asian, Chinese, Black African, or Black Caribbean adults. Eligibility is assessed by your GP and specialist tier 3 services, not determined by cost alone.
How is Wegovy different from Mounjaro for weight loss?
Both are prescription-only weekly injections licensed for UK weight management. Wegovy (semaglutide) is a GLP-1 receptor agonist, while Mounjaro (tirzepatide) is a dual GIP and GLP-1 agonist. Mounjaro showed slightly higher average weight loss in clinical trials (~20% vs ~15%), but individual results vary significantly. Both require clinical assessment and cost similarly on private routes.
Can I switch from Wegovy to Mounjaro on the NHS?
Switching between medications is a clinical decision made by your prescriber on the NHS tier 3 service. Some patients may switch if one medication is ineffective or poorly tolerated, but availability, funding, and individual health factors all influence whether switching is possible. Discuss options with your specialist weight management team.
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.