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
What Does Mounjaro Cost in the UK?
Mounjaro (tirzepatide) is a prescription-only weight management injection available in the UK through both NHS specialist services and private prescribing. The cost of Mounjaro varies significantly depending on whether you access it through the NHS or privately, and the dose you require. Understanding your options — including eligibility, pricing, and the differences between NHS and private routes — can help you make an informed decision about whether this medication is right for you.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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 in the UK
Private prescription costs for Mounjaro typically range from £129 to £320 per month, depending on the dose and the prescribing service. The KwikPen device contains 4 doses (a 4-week supply), so monthly costs reflect a full month's treatment.
- Lower doses (2.5–5 mg): Generally £129–£179 per month
- Mid-range doses (7.5–10 mg): Typically £179–£249 per month
- Higher doses (12.5–15 mg): Usually £249–£320 per month
Private costs also include the online clinical assessment (typically £40–£80, sometimes waived) and delivery. Pricing varies between providers — comparing costs across GPhC-registered pharmacies can help you find the best value. The KwikPen itself is the same across all providers; the cost difference reflects the service's clinical assessment and pharmacy margins. Remember that individual results vary, and the dose you receive will depend on your prescriber's assessment and tolerance.
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 for Mounjaro
NHS access to Mounjaro is through tier 3 specialist weight management services, typically accessed via GP referral. NHS prescriptions are free if you're eligible, but access varies dramatically by region and waiting times can be several months to over a year in many areas. Private access involves an online consultation with a UK-licensed prescriber — no NHS referral needed. You'll answer health questions, receive an assessment, and if approved, get a prescription dispensed by a GPhC-registered pharmacy. Private prescribing is faster (often within days) but costs money. Use our GLP-1 weight loss calculator to explore projected outcomes, and discuss NHS eligibility with your GP first — if NHS waiting lists are short in your area, this may be your most affordable option.
- 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 privately in the UK?
A private Mounjaro KwikPen (containing 4 weekly doses) typically costs £129–£320 per month depending on the dose strength and provider. Starter doses (2.5–5 mg) are usually cheaper than maximum doses (12.5–15 mg). Prices vary between GPhC-registered pharmacies, so comparing services can help you find better value.
Can I get Mounjaro free on the NHS?
Yes, if you're eligible and referred to a tier 3 specialist weight management service by your GP. NHS Mounjaro is free, but eligibility, availability, and waiting times vary significantly by region (ICB). Some areas have long waiting lists; others may not offer it yet. Ask your GP about NHS eligibility in your area first.
What's included in the private Mounjaro cost?
Private costs typically include the online clinical assessment (£40–£80, sometimes waived), the prescription fee, the KwikPen device itself, and delivery. Some providers bundle these; others charge separately. Always check what's included before purchasing. Costs do not include any GP follow-ups or additional blood tests you may need.
Is Mounjaro cheaper than Wegovy in the UK?
Pricing for both Mounjaro and Wegovy varies between private providers, and both can range from £129–£320+ per month. Direct price comparison depends on the specific dose and provider you choose. Some services price them similarly; others may have different costs. Check current pricing with multiple providers for the most accurate comparison.
How long does it take to get Mounjaro privately in the UK?
Private Mounjaro prescriptions are typically processed within 2–7 days once your online assessment is approved. Some services offer next-day delivery. NHS routes take significantly longer — waiting times for tier 3 specialist services range from weeks to over a year depending on your region. Private access is faster but costs money; NHS access is free but may involve waiting.
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.