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) prices in the UK vary significantly depending on whether you access it through the NHS or privately. If you're eligible for NHS tirzepatide through specialist weight management services, there's no direct medication cost, though waiting lists can be lengthy in many regions. Private access through online prescribers costs between £129 and £320 per month depending on your dose. Understanding the different pricing routes, eligibility criteria, and what's involved in accessing Mounjaro can help you make an informed decision about weight management options available to you.
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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 vs Private Mounjaro Costs in the UK
NHS Access: Mounjaro is available through NHS tier 3 specialist weight management services at no direct medication cost to you. However, access requires GP referral and specialist assessment, and waiting lists vary dramatically by region — some areas have waits of 6–18 months or longer. You'll also need to meet NHS eligibility criteria: BMI of 30 or above, or 27–29.9 with weight-related health conditions like type 2 diabetes or high blood pressure.
Private Access: Through GPhC-registered online pharmacies, Mounjaro costs approximately £129–£180 for the 2.5 mg starter dose, rising to £240–£320 for the maximum 15 mg dose per month. Private prescribers assess your eligibility following an online consultation, typically costing £30–£50. You bypass NHS waiting lists entirely but pay the full medication cost yourself.
- NHS: No medication cost but potential waiting times
- Private: Immediate access at full cost
- Each Mounjaro KwikPen contains 4 weekly doses (4 weeks' supply)
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.
Understanding Mounjaro Pricing & Value
When comparing Mounjaro costs, consider the total package: private access removes NHS waiting times but requires upfront payment. The dose you're prescribed affects price — most users begin on 2.5 mg and titrate upwards over 16+ weeks to reach maintenance doses (typically 10–15 mg). Use our free GLP-1 weight loss calculator to understand potential outcomes at different doses, helping you assess whether the investment aligns with realistic expectations. Storage costs are minimal (standard fridge temperature), and each pen lasts exactly 4 weeks. Many private providers offer repeat prescription discounts for ongoing treatment.
- 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 monthly cost of Mounjaro in private UK clinics?
Private Mounjaro costs range from approximately £129–£180 monthly for starter doses (2.5–5 mg) to £240–£320 for maintenance doses (10–15 mg). Prices vary between providers. Some private services offer package discounts for 3- or 6-month supplies. Always confirm the total cost including the prescriber consultation fee (typically £30–£50).
Can I get Mounjaro free through the NHS in the UK?
Yes, Mounjaro is available through NHS specialist tier 3 weight management services at no medication cost if you meet eligibility criteria (BMI ≥30 or ≥27 with comorbidities). However, NHS access requires GP referral and specialist assessment, and waiting lists vary significantly by region — from a few months to over a year in many areas.
How does Mounjaro cost compare to Wegovy in the UK?
Mounjaro and Wegovy have similar private pricing (approximately £129–£320/month depending on dose). Mounjaro has a higher maximum dose (15 mg vs 2.4 mg for Wegovy), which may affect pricing structure. Both are available through NHS tier 3 services at no direct cost if eligible. Your GP or prescriber can advise which is most suitable for your individual situation.
What additional costs should I budget for when taking Mounjaro privately?
Beyond monthly injection costs, budget for the initial prescriber consultation (£30–£50). Storage is cost-free (standard refrigerator). Some users report modest additional expenses for dietary support or gym membership as part of their weight management plan, though these are optional and not specific to Mounjaro.
Is Mounjaro available on prescription through my GP without a specialist referral?
In most NHS regions, Mounjaro is only prescribed through specialist tier 3 weight management services, not standard GP prescribing. You'll typically need GP referral to access these services. Private online prescribers can prescribe directly without NHS referral, though you'll pay full private cost. Contact your local integrated care board to check tier 3 availability in your area.
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.