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 Price Compare UK — What You'll Pay
Mounjaro (tirzepatide) pricing in the UK varies significantly depending on whether you access it through the NHS or privately. If you're considering this prescription weight loss injection, understanding the cost structure — including dose-based pricing, monthly expenses, and access routes — is essential for making an informed decision. This guide breaks down current UK Mounjaro costs and compares your options.
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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.
How Much Does Mounjaro Cost in the UK?
Mounjaro pricing in the UK depends on your access route:
- Private prescriptions: typically range from £129 to £320+ per month depending on dose and provider. Most private online pharmacies charge per KwikPen (a 4-week supply containing four weekly injections).
- Dose-based pricing: starting doses (2.5 mg) are usually cheaper than maintenance doses (15 mg). A 2.5 mg pen may cost around £129–£180, while a 15 mg pen can cost £250–£320.
- NHS access: free on prescription through specialist tier 3/4 weight management services, but availability and waiting times vary dramatically by region (ICB).
- Multiple pens: if you're titrating doses, you may need to purchase different dose strengths sequentially, increasing overall cost during the escalation phase.
Always check with your chosen provider for current pricing, as costs fluctuate and discounts may be available for ongoing treatment.
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 vs Private: Access and Cost Comparison
NHS route: Free prescriptions if approved through specialist weight management services, but access is limited and waiting lists in many regions exceed 6–12 months. Not all ICBs fund Mounjaro routinely; some require specific clinical criteria. Private route: Faster access (typically within days of consultation), available without NHS referral, but requires private payment. Use our GLP-1 weight loss calculator to understand potential outcomes at different doses — this can help you decide if the investment aligns with your goals. Private prescribing requires an online clinical assessment with a UK-licensed prescriber and dispensing through a GPhC-registered pharmacy.
- 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.
How much does a Mounjaro KwikPen cost in the UK?
A single KwikPen (containing four weekly 2.5 mg injections) typically costs £129–£180 privately. Pens at higher doses cost more; a 15 mg KwikPen can cost £250–£320. NHS prescriptions are free, but access is limited to specialist services.
Is Mounjaro cheaper than Wegovy in the UK?
Pricing is similar between Mounjaro and Wegovy privately (both £129–£320/month depending on dose). Direct comparison depends on your provider and the specific doses you require. Clinical efficacy differs slightly between the two GLP-1 medications.
Can I get Mounjaro for free on the NHS?
Yes, Mounjaro is available free on NHS prescription through tier 3/4 specialist weight management services if you meet eligibility criteria. However, waiting times are long in many regions, and availability varies by ICB. Your GP can refer you, but the process can take months.
What's included in the Mounjaro prescription cost?
The cost covers the KwikPen (4 injections, 1 month supply) and any clinical support from your provider. Additional GP consultations may have separate charges on the NHS. Always clarify what's included before starting private treatment.
Do I need multiple KwikPens during dose titration?
Yes. Mounjaro requires starting at 2.5 mg and increasing every 4 weeks until you reach an effective maintenance dose (typically 10 mg or 15 mg). This means purchasing multiple pens at different strengths, increasing total first-month costs compared to maintenance-phase costs.
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.