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
How Much Does Mounjaro Cost in the UK?
Mounjaro (tirzepatide) is available in the UK through both NHS specialist services and private prescription routes, with costs varying significantly depending on which pathway you choose. Private prescriptions typically range from £129 to £320 per month depending on your dose, while NHS access is free at the point of use but involves specialist referral and waiting times. Understanding both options helps you make an informed decision about weight management treatment that suits your circumstances.
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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 Access in the UK
Private prescription costs for Mounjaro in the UK typically range from £129 to £320 per month, depending on your dose level. A Mounjaro KwikPen contains four weekly injections (one month's supply), and costs increase with each dose escalation from 2.5 mg up to the maximum 15 mg. Prices vary between GPhC-registered online pharmacies, so it's worth comparing options. Private access does not require NHS referral — you can access treatment directly through an online clinical assessment with a UK-licensed prescriber. If the prescriber determines you're clinically suitable, a prescription is issued and the medication is dispensed by a regulated pharmacy. This route is faster than NHS pathways and doesn't involve waiting lists, but you pay the full cost yourself. Many people find private access helpful when NHS waiting times are lengthy or specialist services are unavailable in their area.
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 and the Private vs NHS Decision
NHS access to Mounjaro is free at point of use but requires referral to a specialist tier 3 or tier 4 weight management service. Your GP can refer you, though eligibility criteria and availability vary significantly by region and integrated care board (ICB). Waiting lists for NHS specialist services can span months or years in many areas. Some people choose private treatment to avoid waiting, while others prefer to wait for NHS access if they meet eligibility criteria. Consider your budget, urgency, and local NHS availability when deciding which route suits you. Our GLP-1 weight loss calculator can help you understand potential outcomes at different Mounjaro doses, and our BMI calculator confirms your eligibility based on NHS thresholds.
- 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?
Mounjaro pricing reflects the dose strength — higher doses require more active ingredient (tirzepatide) per injection. You also need to escalate gradually (at least 4 weeks at each dose), so higher doses are only reached after several months. Prices quoted by pharmacies typically cover the full KwikPen (four weekly injections) at that dose level.
Are there any hidden fees with private Mounjaro prescriptions?
The stated price per month typically covers the medication only. Some online pharmacies may charge separately for the clinical consultation (usually £15–£50) or delivery. Always check the total cost before proceeding. NHS prescriptions have no additional fees beyond any standard NHS prescription charge (currently £10.65 per item in England, though some patients are exempt).
Can I switch from private Mounjaro to NHS treatment?
Technically yes, but it requires a fresh NHS referral and assessment by a specialist service. Your GP would need to refer you to tier 3 services, and you would need to meet NHS eligibility criteria. Waiting times apply, and your private prescription does not automatically transfer. Plan ahead if you're considering switching pathways.
Is Mounjaro covered by private health insurance in the UK?
Most private health insurance policies do not cover weight management medications like Mounjaro, as weight loss treatment is typically classified as non-essential. Some policies may cover related consultations. Check your specific policy wording or contact your provider directly. NHS coverage is automatic for eligible patients referred through specialist services.
What is the cheapest way to access Mounjaro in the UK?
NHS access is free at point of use if you're eligible and referred to specialist services — this is the lowest cost option. Private prescriptions cost £129–£320/month. Some areas offer NHS tier 2 weight management programmes free before specialist referral. Discuss all options with your GP to find the most cost-effective route for your circumstances.
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.