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 Chart: UK Cost and Access Guide
Wegovy (semaglutide) is a prescription-only weight loss injection available in the UK through both NHS specialist services and private online prescribing. This guide explains the typical weekly weight loss progression, current costs in the UK, eligibility criteria, and how to access this GLP-1 medication. Whether you're considering Wegovy as part of your weight management plan or want to understand the realistic cost and access routes, this information covers everything you need to know about getting started with this weekly injection in the UK.
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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.
Wegovy Weight Loss Projections and UK Costs
Based on clinical trial data, Wegovy typically supports weight loss of around 14–15% of body weight over 68 weeks at the maximum 2.4mg dose, though individual results vary significantly. Use our free GLP-1 weight loss calculator above to estimate your potential weight loss at different doses based on your starting weight.
UK private costs for Wegovy typically range from £150–£290 per month depending on the dose and provider, though prices vary. This covers the prescription assessment and supply. Most private providers charge per dose tier: starter doses (0.25–0.5mg) are usually cheaper than maintenance doses (1.7–2.4mg). NHS access is free but requires referral to a specialist tier 3 weight management service, which may involve significant waiting times in many regions. Your GP can advise whether you meet NHS criteria in your area.
- Private dose costs: approximately £20–£50 per injection depending on dose level
- Monthly supply: four weekly injections = typically £80–£200/month at private providers
- No NHS charges once prescribed through specialist services
- Cost varies by provider — always compare before choosing
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 to Wegovy in the UK
NHS route: Referral to your local tier 3 specialist weight management service, available through your GP. Assessment by a multidisciplinary team, then prescription if you meet criteria (BMI ≥30, or BMI 27–29.9 with weight-related health conditions). Completely free but waiting lists can extend to 12+ months in some regions depending on your Integrated Care Board.
Private route: Online consultation with a UK-licensed prescriber via a GPhC-registered pharmacy. Typically takes 2–5 working days from initial assessment. You pay per prescription. No NHS referral needed. Faster access but patient-funded. All prescribers will check your eligibility, medical history, and current medications during the online consultation before issuing a prescription.
Calculate your BMI using our free BMI calculator above to check whether you meet the eligibility thresholds (BMI ≥27 with health conditions, or ≥30 without).
- 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 per month in the UK privately?
Private Wegovy costs typically range from £150–£290 per month in the UK, depending on the dose and provider. Starter doses (0.25–0.5mg) are generally cheaper than higher maintenance doses (1.7–2.4mg). You may pay per injection or per month. Prices vary between providers, so it's worth comparing. NHS supply is completely free once prescribed through specialist services.
How long does it take to see weight loss results with Wegovy?
Most people see initial weight loss within the first 4 weeks on Wegovy, though some take 6–8 weeks to notice changes. The first few doses are lower starter doses to allow your body to adjust. Maximum weight loss typically occurs around weeks 16–20 as you reach the 2.4mg maintenance dose. Clinical trials showed average weight loss of around 15% body weight over 68 weeks.
Can I get Wegovy on the NHS in the UK?
Yes, Wegovy is available on the NHS through specialist tier 3 weight management services. You need a GP referral and must meet eligibility criteria: BMI of 30 or above, or BMI 27–29.9 with weight-related health conditions like type 2 diabetes or high blood pressure. Availability and waiting times vary significantly by region (Integrated Care Board).
What is the typical weekly weight loss with Wegovy?
Individual weekly weight loss varies, but clinical data suggests an average loss of around 0.3–0.5kg per week when taking the maximum 2.4mg dose alongside a reduced-calorie diet and increased physical activity. Some weeks you may lose more, some weeks less. Progress is not linear. Genetic factors, lifestyle, and metabolism all influence individual results.
How do I get a prescription for Wegovy privately?
Contact a GPhC-registered online pharmacy offering Wegovy. Complete an online health assessment form covering your medical history, current medications, and weight loss goals. A UK-licensed prescriber reviews your information within 1–2 working days. If approved, a prescription is issued to a registered pharmacy. Your first supply typically arrives within 3–5 working days.
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.