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
Mounjaro Injection Prices in the UK
Mounjaro (tirzepatide) is a prescription-only weight loss injection available in the UK through both NHS specialist services and private online prescribing routes. The cost varies significantly depending on whether you access it through the NHS or privately. Understanding your options—eligibility criteria, typical pricing, and how the NHS tier 3 services work—can help you make an informed decision about whether Mounjaro is right for you. Our free GLP-1 weight loss calculator can help you explore potential outcomes with this medication.
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.
NHS Access and Mounjaro Availability
Mounjaro on the NHS: NICE (National Institute for Health and Care Excellence) has approved tirzepatide for use within NHS specialist weight management services, but availability and costs vary significantly by region. Access is typically through a tier 3 or tier 4 specialist multidisciplinary weight management service, reached via referral from your GP. Many regions have substantial waiting lists—sometimes months or even years—depending on local commissioning and service capacity. When dispensed through the NHS, there is no additional cost to you beyond your standard NHS prescription charge (currently £9.90 per item in England, though some people are exempt). The NHS covers the medication cost entirely once approved. However, a key limitation is that not all ICBs (Integrated Care Boards) commission Mounjaro equally; some may have restrictions on who can access it or may favour alternatives like Wegovy.
- NICE guidance supports tirzepatide for adults with BMI ≥30, or ≥27 with weight-related health conditions
- Prescription issued by specialist service, dispensed through NHS pharmacy
- Your GP will advise on local tier 3 service referral pathways
- Waiting times vary; some regions have delays of 6–24 months or longer
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 Mounjaro Costs and Access
Private access: Mounjaro is available through GPhC-registered online prescribing services following an online clinical assessment. Private costs range from approximately £130–£350 per month depending on the dose and provider. Starting doses (2.5 mg) are typically at the lower end of this range, while maintenance doses (10–15 mg) are at the higher end. Costs may be higher if obtained through private GP clinics or private weight management services. The advantage of the private route is immediate access without waiting lists—you can begin treatment within days if approved. However, there is no NHS subsidy, so the full cost is your responsibility. Some private providers offer subscription models or dose-based pricing structures, so it's worth comparing services. Use our free BMI calculator to confirm your eligibility before pursuing either route.
- 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 Mounjaro cost on the NHS in the UK?
When prescribed through NHS tier 3 specialist weight management services, Mounjaro is free beyond the standard NHS prescription charge (£9.90 in England). However, availability varies by region and waiting times can be long. Your GP can advise on local access and referral processes.
What is the typical private cost for Mounjaro in the UK?
Private Mounjaro typically costs £130–£350 per month depending on dose and provider. Starting doses are usually cheaper; higher maintenance doses cost more. Private access is faster than NHS but you pay the full cost.
What is the difference between NHS and private Mounjaro access?
NHS access is free (except prescription charge) but involves waiting and regional restrictions. Private access is immediate but you pay the full cost. Both require a valid prescription from a UK-licensed prescriber following clinical assessment.
Can I get Mounjaro through my GP surgery without a specialist referral?
In most cases, no. Standard GP practices do not prescribe Mounjaro; it is initiated through NHS tier 3 specialist weight management services via referral. Private online prescribing services offer an alternative without waiting.
Does Mounjaro cost the same as Wegovy in the UK?
Pricing differs between providers and doses. Both Mounjaro and Wegovy are available privately at similar price ranges (£130–£350/month), but costs vary. NHS access for both is free beyond prescription charges, though both face regional availability issues and waiting times.
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.