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
Is Wegovy Available in the UK?
Yes, Wegovy (semaglutide) is available in the UK for weight management. It's a prescription-only, once-weekly injectable medication licensed for adults with obesity or overweight with weight-related health conditions. You can access it through NHS specialist weight management services or via private prescription following an online clinical assessment. Availability, costs, and waiting times vary significantly depending on your route and region.
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.
Private Wegovy Access and Costs in the UK
Wegovy is available privately in the UK through GPhC-registered online pharmacies following a clinical assessment with a UK-licensed prescriber. Private costs typically range from £129 to £320 per month depending on your dose and provider. A standard pack contains four pre-filled injection pens (a four-week supply). Starting doses (0.25 mg) cost less than maintenance doses (1.7 mg or 2.4 mg). Many providers offer dose escalation packages where you progress through doses as your body adjusts. Some private services offer payment plans or subscription discounts. The online consultation process is quick — typically 15–30 minutes — and if approved, your prescription is dispensed directly to your home. You'll need a valid UK address and be registered with a UK GP, though you don't need a GP referral to access private treatment.
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 access: Wegovy is available through tier 3 specialist weight management services following NICE guidance. You'll need a GP referral and assessment. NHS waiting lists are currently very long — in many areas, 12–24 months or longer. Availability varies by region (ICB). Private access is faster but costs more. You don't need an NHS referral; instead, complete an online health questionnaire and video or phone consultation with a prescriber. Eligibility is similar to NHS (BMI ≥27 with health conditions, or ≥30 without), but private services may assess more flexibly. Our GLP-1 weight loss calculator can help you understand potential outcomes, and our BMI calculator shows whether you may meet eligibility criteria based on your current measurements.
- 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 privately in the UK?
Private Wegovy costs range from approximately £129–£320 per month depending on dose. Each pack contains four weekly injections. Starting doses (0.25 mg) cost less; maintenance doses (2.4 mg) cost more. Some providers offer subscription discounts or payment plans, reducing monthly cost.
Do I need an NHS referral to get Wegovy privately?
No. Private prescription services do not require an NHS referral. You complete an online health questionnaire, have a video or phone consultation with a UK-licensed prescriber, and if approved, your prescription is dispensed by a GPhC-registered pharmacy directly to your home.
How long are NHS waiting lists for Wegovy in the UK?
NHS waiting lists for tier 3 specialist weight management services are currently very long — typically 12–24 months or longer depending on your region. Access through NHS is free but requires a GP referral and specialist assessment.
What's the difference between Wegovy and Mounjaro for UK access?
Both are prescription-only weight loss injections available in the UK. Wegovy (semaglutide) is a GLP-1 agonist; Mounjaro (tirzepatide) is a dual GIP/GLP-1 agonist with slightly higher average weight loss in clinical trials. Both cost similarly privately (£129–£320/month). Eligibility and access routes are the same.
Can I get Wegovy on the NHS without going private?
Yes, through a GP referral to a tier 3 specialist weight management service in your area. However, NHS availability is limited and waiting times are very long. Your GP assesses your eligibility based on BMI and weight-related health conditions.
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.