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 pricing in the UK varies significantly depending on whether you access it through the NHS or privately. On the NHS, Mounjaro (tirzepatide) is available free through specialist weight management services, though access varies by region and waiting times can be lengthy. Private pricing typically ranges from £129 to £320 per month depending on your dose, with costs higher at maximum doses. Understanding your eligibility and access routes — whether through NHS referral or private online prescription — helps you plan your treatment and manage expectations around timelines and expense.
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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.
Understanding Mounjaro Cost by Access Route
NHS Access (Free): Mounjaro is available through NICE-approved NHS specialist tier 3 and tier 4 weight management services. The medication itself is free once prescribed, but access requires referral from your GP and assessment by a specialist team. Availability and waiting times vary considerably by region and Integrated Care Board (ICB). Some areas have waiting lists exceeding 12–18 months, whilst others may have shorter timescales. You can contact your local weight management service through your GP to check current availability.
Private Access (Paid): Through GPhC-registered online pharmacies following consultation with a UK-licensed prescriber, private Mounjaro costs typically range from £129 to £320 per month depending on your dose. Pricing structure: lower starter doses (2.5–5 mg) cost less, whilst maintenance and maximum doses (10–15 mg) cost more. Some providers offer loyalty discounts or multi-month packages. Prescriptions are issued following a confidential online clinical assessment.
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.
Factors Affecting Your Mounjaro Cost
Several factors influence what you'll pay for Mounjaro privately: your current dose (starter doses are cheaper than maximum doses), your provider (prices vary between registered pharmacies), and whether you're on a standard or discounted package. If you're eligible for NHS access, the cost to you is zero, but you'll need to factor in waiting time — sometimes 6–24 months depending on your area. Use our free GLP-1 weight loss calculator to explore projected results at different doses, which may help you decide whether private treatment aligns with your expectations and budget. Always check that your chosen provider is GPhC-registered to ensure safe, legitimate prescribing.
- 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.
What is the typical private cost of Mounjaro per month in the UK?
Private Mounjaro costs typically range from £129 to £320 per month, depending on your dose. Starter doses (2.5–5 mg) are at the lower end, whilst maintenance doses (10–15 mg) are at the higher end. Prices vary between registered pharmacies, and some offer multi-month discounts.
Is Mounjaro free on the NHS in the UK?
Yes, Mounjaro is free through the NHS when prescribed by a specialist weight management service. However, access requires GP referral and specialist assessment. Availability and waiting times vary significantly by region — some areas have waits of 12–18 months or longer.
How do I check Mounjaro availability on the NHS in my area?
Ask your GP to refer you to your local tier 3 or tier 4 specialist weight management service. Your GP can check current waiting times and eligibility. Alternatively, contact your Integrated Care Board (ICB) directly to ask about weight management services in your region.
What does Mounjaro cost if I go private versus NHS?
On the NHS, Mounjaro is free once prescribed but involves waiting for specialist assessment. Privately, you'll pay £129–£320 per month depending on dose, but access is faster — typically within days of online consultation. Calculate your BMI and eligibility using our free BMI calculator to understand whether you may qualify for NHS access.
Are there cheaper alternatives to Mounjaro for weight loss in the UK?
Other UK-licensed weight loss medications include Wegovy (semaglutide) and Saxenda (liraglutide), with varying costs. Prices differ by provider and dose. Your GP can advise which options are appropriate for you based on your health profile and NHS referral decisions.
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.