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 a private route. On the NHS, access is free but availability is limited and waiting times can be lengthy. Through private online prescribing, Mounjaro typically costs between £129 and £320 per month depending on your dose, as costs increase with each dose escalation from 2.5 mg to 15 mg. This guide explains both routes, what affects the price, and how to work out the most cost-effective option for your situation.
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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.
Private Mounjaro Costs and Dose Pricing
Private Mounjaro prescriptions in the UK are dispensed through GPhC-registered pharmacies following an online clinical assessment with a UK-licensed prescriber. Costs typically range from £129 to £320 per month, depending on your dose level and the provider you choose.
Approximate private pricing by dose:
- 2.5 mg (starting dose): £129–£160 per month
- 5 mg: £150–£190 per month
- 7.5 mg: £170–£220 per month
- 10 mg: £190–£260 per month
- 12.5 mg: £210–£290 per month
- 15 mg (maximum dose): £240–£320 per month
Prices vary between providers, so comparing quotes before committing is wise. Each KwikPen contains four weekly doses (one month's supply). Some providers offer discount bundles if purchasing multiple months in advance. Use our GLP-1 weight loss calculator to estimate your likely dose before calculating total costs.
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 Access vs Private Routes
The NHS route is completely free but has significant barriers: access requires referral to a tier 3 specialist weight management service from your GP, and availability varies dramatically by region. Some ICBs (Integrated Care Boards) have long waiting lists lasting months or even years. NICE approval means Mounjaro is available on the NHS, but regional funding decisions affect actual availability.
The private route offers faster access—typically within days of consultation—but costs money. An online consultation with a prescriber costs £20–£50 (sometimes waived), and medication costs apply. For those who cannot access NHS services quickly, private prescription may be more cost-effective when you factor in the time value of starting treatment sooner. Compare both routes with your GP before deciding.
- 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.
Why does Mounjaro cost more at higher doses?
Each dose requires a different KwikPen with a different formulation. Manufacturing, stability testing, and pharmacy dispensing costs all increase with higher doses, so pricing reflects this. Dose titration (gradual increase) means you typically pay lower prices initially, then increase as you progress.
Can I get Mounjaro cheaper through the NHS?
Yes—NHS Mounjaro is completely free if you qualify and are accepted into a specialist weight management service. However, waiting lists can be very long in many regions, and not all ICBs currently commission it. Ask your GP about tier 3 services and waiting times in your area.
Is Mounjaro cheaper than Wegovy in the UK?
Pricing is similar at equivalent doses—both GLP-1 medications typically cost between £129 and £320 per month privately. Mounjaro may have a slight advantage as a dual GIP/GLP-1 agonist, but clinical trial data showed comparable weight loss to Wegovy, so individual results vary. Your prescriber can advise which is most suitable.
Do private Mounjaro prices include the prescription cost?
No—usually you pay separately for the online consultation/prescription (£20–£50 or sometimes free) and then the medication cost. Some providers bundle this into a single price. Always confirm the total cost before ordering, including whether repeat prescription fees apply.
What's the cheapest way to access Mounjaro long-term?
If you can access the NHS within a reasonable timeframe, that's free. If waiting lists are very long, calculate private costs over 6–12 months and compare to the time cost of waiting. Some people start private while on NHS waiting lists, then switch if NHS access becomes available.
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.