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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How Much Does Mounjaro Cost in the UK?
Mounjaro (tirzepatide) costs vary significantly depending on whether you access it through the NHS or privately. Private prescription costs typically range from £129 to £320 per month, depending on your dose and provider, while NHS access is free at point of care but often involves lengthy waiting times and regional availability differences. This guide explains both routes, what affects pricing, and how to understand the true cost of treatment.
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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 Mounjaro Costs and What Affects Pricing
Private prescription costs for Mounjaro in the UK range from approximately £129 to £320 per month, depending on your starting dose and the provider. The KwikPen device contains 4 weeks of injections (one dose per week), and costs increase as you titrate to higher doses over 16–20 weeks. Starting doses like 2.5 mg are typically cheaper than maximum doses of 15 mg.
Several factors affect what you'll pay: your current dose (higher doses cost more), the online pharmacy or prescribing service you use (prices vary between providers), and whether you're accessing treatment for the first time or continuing an existing prescription. Some private providers offer discount schemes for multiple-month packages. It's worth comparing costs across different GPhC-registered online services before committing, as prices are not standardised and can vary by £50–100 per month for the same dose between providers.
- 2.5 mg starter dose: typically £129–£160 per month
- 5 mg dose: typically £150–£200 per month
- 10 mg dose: typically £180–£260 per month
- 15 mg maximum dose: typically £220–£320 per month
These are approximate ranges based on typical private UK pricing — always check current costs with your chosen provider, as prices change regularly.
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 Access vs Private: Cost, Waiting Times, and Eligibility
NHS access to Mounjaro is completely free at point of care, but availability is extremely limited and varies dramatically by region. NICE approved tirzepatide for NHS use within specialist tier 3 weight management services, but your GP must refer you to your local integrated care board (ICB) first. Waiting lists for NHS specialist services can range from several months to over a year in many areas of the UK.
Private prescription routes bypass NHS waiting lists entirely — you can be assessed and prescribed within days through a UK-licensed online prescriber. However, you pay the full cost yourself (£129–£320+ per month depending on dose). The choice depends on your priorities: free but slow (NHS) versus paid but immediate (private). Use our free GLP-1 weight loss calculator to estimate your potential dose and factor costs into your planning.
- 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 Mounjaro free on the NHS in the UK?
Mounjaro is free on the NHS, but access is extremely limited. You must be referred to a specialist tier 3 weight management service by your GP, and many areas have waiting lists of months to years. NICE approved tirzepatide for NHS use, but regional availability varies significantly. Check with your local ICB about current waiting times.
How much does a month's supply of Mounjaro cost privately?
Private Mounjaro costs typically range from £129 to £320 per month depending on your dose. Starting doses (2.5 mg) cost less, while the maximum 15 mg dose costs more. Prices vary between providers, so compare costs across GPhC-registered online services before choosing.
What's included in the monthly cost of Mounjaro?
The monthly cost covers one KwikPen (4 weeks of pre-filled injections, one per week), the clinical assessment, and the prescription itself. Some providers include follow-up support. Check whether your chosen provider includes additional services like diet advice or progress tracking before committing.
Is there a difference in cost between Mounjaro and Wegovy on the NHS?
Both Mounjaro and Wegovy are free on the NHS if you qualify and can access specialist services. However, availability differs by region. Private costs also vary between the two — compare prices with your chosen provider. Use our weight loss calculator to estimate which medication might suit your needs.
How do I know what dose of Mounjaro I'll need and therefore what it will cost?
Your prescriber will start you on the lowest dose (2.5 mg) and increase gradually over 16–20 weeks based on your response and tolerability. This means your monthly costs will increase over time as you titrate up. Budget for starter doses initially, then higher costs as you reach your maintenance dose (typically 10–15 mg).
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.