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
How Much Does Munjaro Cost in the UK?
Munjaro (tirzepatide) is a prescription-only weight loss injection available in the UK through both NHS specialist services and private prescribing routes. The cost depends significantly on whether you access it through the NHS or privately. If you're eligible for NHS treatment, Munjaro is typically free at the point of use through tier 3 specialist weight management services, though availability varies by region. For private access, costs range from approximately £129 to £320 per month depending on your dose. Understanding the differences between these routes can help you find the most suitable and affordable option for your circumstances.
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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: Eligibility, Cost, and Availability
NHS Munjaro is free when prescribed through specialist tier 3 weight management services. However, access is limited and varies significantly by region. You typically need a GP referral to a specialist weight management service, and waiting lists can be several months to over a year in many areas. NICE (National Institute for Health and Care Excellence) has approved tirzepatide for NHS use, but funding decisions rest with individual Integrated Care Boards (ICBs). Some regions have faster access than others.
- NHS cost: Free (on prescription)
- Access route: GP referral to tier 3 specialist service
- Waiting time: Typically 3–12 months depending on region
- Eligibility: BMI ≥30, or BMI 27–29.9 with weight-related health conditions
Contact your GP to enquire about specialist weight management services in your area and current waiting times. They can assess whether you meet the criteria and begin the referral process.
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 Access: Cost, Speed, and What to Expect
Private Munjaro costs between £129 and £320 per month, depending on your starting dose and which provider you use. Prices vary because different GPhC-registered online pharmacies set their own pricing. You avoid NHS waiting lists—private consultations typically take days rather than months. A UK-licensed prescriber reviews your health history online, and if suitable, issues a prescription dispensed by the pharmacy.
- Private cost: £129–£320/month (starting doses lower, maximum doses higher)
- Access time: Usually 2–7 days from consultation to first dose
- No GP referral needed
- Clinical assessment required before prescription
It's worth comparing prices across providers before committing. Use our GLP-1 weight loss calculator to estimate potential outcomes at different doses, which may help inform your decision about which route suits your situation best.
- 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 Munjaro free on the NHS in the UK?
Yes, Munjaro (tirzepatide) is free on NHS prescription when prescribed by tier 3 specialist weight management services. However, access is limited and varies by region. You need a GP referral, and waiting lists are typically 3–12 months. Not all areas have funded tirzepatide availability yet—contact your GP to check your local situation.
How much does Munjaro cost privately in the UK?
Private Munjaro costs roughly £129–£320 per month depending on your dose. Starting doses (2.5 mg) are cheaper; maximum doses (15 mg) are more expensive. Prices vary between GPhC-registered online pharmacies, so it's worth comparing quotes. Private access is faster than NHS—usually available within days.
Which Munjaro dose costs the most privately?
The 15 mg dose is typically the most expensive, usually around £280–£320 per month privately. Each dose level costs more as you increase from the 2.5 mg starting dose. Your prescriber will recommend a starting dose and adjust gradually, so initial costs will be lower than maximum dose pricing.
Can I get Munjaro on the NHS if I can't afford private?
You can request an NHS referral through your GP to a tier 3 specialist weight management service. Eligibility requires a BMI of 30 or above, or 27–29.9 with weight-related health conditions. NHS availability varies by region and ICB funding, so waiting times and approval chances differ. Ask your GP about your local service.
How long do you stay on Munjaro, and does cost continue?
Munjaro is typically prescribed for 52 weeks initially, then reassessed. If you continue beyond that, costs continue monthly (NHS free, private £129–£320/month). Your prescriber will review whether to continue based on your progress and health. Some people pause or stop after initial treatment; others continue longer term.
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.