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 Mounjaro Cost in the UK?
Mounjaro (tirzepatide) pricing in the UK varies significantly depending on whether you access it through the NHS or privately. Private prescriptions typically cost between £130 and £350 per month depending on your dose, whilst NHS access is free at point of use but availability is limited and varies by region. Understanding the costs involved — and the different routes to access this prescription weight loss injection — can help you make an informed decision about whether treatment is right 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.
Private Mounjaro Pricing in the UK
Private prescription costs for Mounjaro range from approximately £130 to £350 per month, depending on your dose level. The Mounjaro kwikpen comes with 4 pre-filled doses (one month's supply), and pricing scales as you progress through the dose titration schedule:
- Starting doses (2.5 mg to 5 mg): typically £130–£180 per month
- Mid-range doses (7.5 mg to 10 mg): typically £200–£280 per month
- Higher doses (12.5 mg to 15 mg): typically £280–£350 per month
Prices vary between GPhC-registered online pharmacies and may differ based on provider, location, and any available packages. Many providers offer subscription models or discount codes for ongoing treatment. Private access requires a UK prescription from a licensed prescriber following an online clinical assessment — you do not need an NHS referral.
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 to Mounjaro — Availability & Cost
Mounjaro is available through the NHS for weight management, but access is free only if prescribed through a specialist weight management service. However, NHS availability is extremely limited and varies significantly by region depending on your Integrated Care Board (ICB). Many areas have waiting lists of several months or longer.
NHS access typically requires referral from your GP to a tier 3 or tier 4 specialist weight management service. The NICE guidance supports tirzepatide for weight management, but NHS capacity constraints mean private access is often faster and more accessible for those who can afford it.
- 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 available on the NHS in the UK?
Yes, Mounjaro is approved by NICE for NHS use in specialist weight management services. However, availability is limited and varies significantly by region. Access requires referral to a tier 3 or 4 specialist service from your GP, and waiting times can be several months. Many people choose private prescribing for faster access.
How much does a month's supply of Mounjaro cost privately?
Private Mounjaro typically costs between £130 and £350 per month depending on your dose. A Mounjaro kwikpen contains 4 weekly doses. Starter doses (2.5–5 mg) are cheaper; higher maintenance doses (12.5–15 mg) cost more. Prices vary between online pharmacies and may include subscription discounts.
What's included in the cost of private Mounjaro?
Private pricing covers the Mounjaro kwikpen (4 weeks of doses) and the online clinical assessment required before prescribing. It does not typically include GP follow-up or monitoring, though some providers offer additional support. You may incur separate costs for any additional health checks your prescriber recommends.
Can I use my private health insurance to cover Mounjaro costs?
Most private health insurance policies do not cover weight loss medications. Coverage varies by provider and policy type. Check with your insurer directly to confirm whether Mounjaro or weight management injections are covered under your specific plan.
How do Mounjaro costs compare to Wegovy pricing?
Mounjaro and Wegovy (semaglutide) have similar private pricing ranges, typically £130–£350 per month depending on dose. Costs vary between providers. The mounjaro vs wegovy decision should be based on clinical suitability and your GP or prescriber's recommendation, not solely on price. Our GLP-1 weight loss calculator can help you understand potential outcomes with either medication.
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.