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 UK Price — What You Need to Know
Mounjaro (tirzepatide) is available in the UK through both NHS specialist weight management services and private online prescribing, but costs vary significantly depending on your route of access. If you're considering this prescription weight loss injection, understanding UK pricing and eligibility is essential. This guide covers NHS access, private costs, and how to check if you qualify for treatment in the UK.
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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 Access and Eligibility for Mounjaro
NHS availability: Mounjaro is approved by NICE for use within NHS tier 3 specialist weight management services. However, availability varies dramatically by region, and many NHS services have lengthy waiting lists or restricted access criteria.
Eligibility for NHS prescription: You typically need a BMI of 30 kg/m² or above, or BMI of 27–29.9 with weight-related health conditions (type 2 diabetes, high blood pressure, cardiovascular disease, or sleep apnoea). For South Asian, Chinese, Black African, or Black Caribbean adults, lower BMI thresholds may apply.
- NHS prescription is free once approved through a specialist tier 3 service
- Requires GP referral to your local specialist weight management service
- Access depends on ICB funding and regional commissioning decisions
- No out-of-pocket cost for the medication itself, but waiting times can range from weeks to over a year
Use our free BMI calculator above to check your current BMI and see whether you may fall within typical eligibility criteria.
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 Pricing in the UK
Private cost range: Private Mounjaro costs approximately £129–£320 per month depending on dose, with higher doses costing more. Most private online prescribers charge per dose rather than per pen.
- Starting dose (2.5 mg): typically £129–£180/month
- Mid-range doses (5–10 mg): typically £180–£250/month
- Maximum dose (15 mg): typically £250–£320/month
Private access is through UK-licensed online prescribers and GPhC-registered pharmacies, with no NHS referral needed. You'll have a remote clinical assessment, and if approved, your prescription is dispensed directly. Private treatment offers faster access but at personal cost. Our GLP-1 weight loss calculator can help you estimate potential outcomes at different doses.
- 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 once prescribed through an NHS tier 3 specialist weight management service. However, accessing NHS prescription requires GP referral and specialist assessment, with significant regional variation and waiting lists. Many areas have restricted availability or high thresholds for access.
What's the difference between NHS and private Mounjaro pricing?
NHS prescription is free but involves waiting lists and restricted access. Private Mounjaro costs £129–£320 per month depending on dose, requires a remote clinical assessment, and offers faster access without NHS referral. Total private cost depends on how long you take the medication.
How much does a Mounjaro KwikPen cost privately in the UK?
A single Mounjaro KwikPen (containing four weekly doses) costs approximately £129–£320 privately, depending on the dose strength. Pricing varies between online prescribers. Most private services charge monthly rather than per individual pen.
Can I get Mounjaro on prescription without going private?
Yes, through NHS tier 3 specialist weight management services if you meet eligibility criteria (BMI ≥30 or BMI 27–29.9 with comorbidities). You'll need a GP referral. Availability varies by region; contact your GP to ask about your local service and waiting times.
What happens after I stop taking Mounjaro?
Weight management continues to require lifestyle changes including diet and physical activity. Some people regain weight after stopping, while others maintain loss. Your prescriber can discuss long-term management strategies and whether continued treatment is appropriate for your situation.
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.