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
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How Much Does Mounjaro Cost in the UK?
Mounjaro (tirzepatide) costs vary significantly depending on whether you access it through the NHS or privately, and which dose you require. If you're considering this prescription weight loss injection, understanding the cost structure is essential. We've broken down pricing, eligibility, and your options for accessing Mounjaro in the UK so you can make an informed decision about whether it's right for 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.
Mounjaro Pricing — NHS vs Private Access
NHS access: Mounjaro is available on the NHS through specialist tier 3 and tier 4 weight management services, but costs vary by region. Some ICBs (Integrated Care Boards) offer it free, while others have restricted access or long waiting lists. Your GP can refer you to your local specialist weight management service to find out availability in your area.
Private access: Private pricing typically ranges from £129 to £320+ per month depending on your dose. A KwikPen (containing 4 weekly injections) usually costs between £180 and £300. Costs vary by provider, dose strength, and whether you're starting at 2.5 mg or escalating to higher doses like 10 mg or 15 mg. Many private online prescribing services offer clearer pricing upfront.
Whichever route you choose, remember that Mounjaro is prescription-only and requires a clinical assessment before being prescribed — pricing does not include this 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.
Cost Breakdown by Dose and What Affects Price
Mounjaro comes as a KwikPen containing 4 weekly doses. Starting doses (2.5 mg) may cost less than maintenance or higher doses (10 mg, 15 mg), as dose titration typically takes 16–20 weeks. Private providers often charge per pen or per dose, so your total monthly cost depends on which dose your prescriber has recommended.
Factors affecting cost: Prescription fees (if applicable), GP assessment or private consultation fees (usually £50–£150), and whether you're on a fixed dose or still titrating. Some private services include follow-up consultations in their pricing; others charge separately. Always clarify the total cost upfront, including any monitoring or repeat prescription fees.
- 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?
Mounjaro is available free on the NHS through specialist weight management services, but availability varies significantly by region. Some areas have good access; others have long waiting lists or restricted eligibility. Contact your GP to check what's available in your ICB area. Private access is faster but involves upfront costs.
What's the difference between Mounjaro cost on the NHS and private?
On the NHS, Mounjaro is free once prescribed by a specialist service, though you may wait months for assessment. Privately, expect to pay £129–£320+ per month depending on dose, plus consultation fees (£50–£150). Private access is quicker but you pay throughout treatment.
Does the cost include the clinical assessment?
No. NHS costs don't include the initial GP referral (free) or specialist assessment (free on NHS). Private costs typically show the medication price separately from consultation fees. Always ask whether consultation, prescription, and monitoring are included in quoted prices.
Why does Mounjaro cost more at higher doses?
Mounjaro comes in pre-filled KwikPens at different strengths (2.5 mg, 5 mg, 7.5 mg, 10 mg, 12.5 mg, 15 mg). Higher dose pens generally cost more. Your prescriber will start you at 2.5 mg and increase gradually over weeks, so costs may change as you escalate through dose titration.
Can I use my BMI to check if I'm eligible for Mounjaro?
Eligibility is based on BMI and health conditions, but a prescriber must assess you individually. Use our free BMI calculator to check your BMI, then consult your GP or a licensed prescriber to see whether Mounjaro is clinically appropriate for you.
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.