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 Comparison in the UK
If you're considering Mounjaro (tirzepatide) for weight management in the UK, cost is an important factor. The price varies significantly depending on whether you access it through the NHS or privately, and understanding the differences can help you make an informed decision. This guide explains Mounjaro pricing across both routes, NHS eligibility criteria, and what factors affect the cost of this prescription weight loss injection.
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.
NHS Access and Private Pricing for Mounjaro in the UK
Mounjaro is a prescription-only medicine available through both NHS specialist services and private prescribing in the UK. NHS access is through tier 3 specialist weight management services — typically following referral from your GP. However, NHS availability varies significantly by region (Integrated Care Board), and waiting lists can extend several months to over a year in many areas. When available through the NHS, Mounjaro is provided at no cost to eligible patients.
Private prescribing costs typically range from £129 to £320 per month, depending on your dose. Starting doses (2.5 mg) are at the lower end of this range, whilst maximum maintenance doses (15 mg) cost considerably more. The Mounjaro KwikPen contains four weekly doses — so monthly cost reflects a four-week supply at your current dose. As you titrate up through doses (starting at 2.5 mg and increasing every 4 weeks), your monthly cost will increase. Private prescriptions are issued following an online clinical assessment with a UK-licensed prescriber through GPhC-registered pharmacies.
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.
Factors Affecting Mounjaro Costs and How to Access the Best Price
Your final Mounjaro cost depends on several factors: your current dose (KwikPens at higher doses are more expensive), whether you qualify for NHS access through your local tier 3 service, your eligibility criteria (BMI and health conditions), and your chosen private provider. Using our free GLP-1 weight loss calculator can help you understand what dose might be appropriate for your circumstances, which helps estimate potential costs. If pursuing NHS access, speak to your GP about referral to your local specialist weight management service — NICE has approved tirzepatide for use in NHS specialist services in eligible adults. For private access, compare GPhC-registered online pharmacies, as pricing can vary by provider and current promotions.
Many patients find that the tirzepatide UK prescription route through private online prescribing offers faster access than NHS waiting lists, though at a direct cost. Eligibility for Mounjaro typically includes adults with a BMI of 30 or above, or 27 or above with weight-related health conditions such as type 2 diabetes, high blood pressure, or cardiovascular disease. South Asian, Chinese, Black African, and Black Caribbean adults may be eligible at lower BMI thresholds (from 27.5). A prescriber will assess whether Mounjaro is suitable for you based on your individual health profile — this assessment is essential before any prescription is issued. Remember that Mounjaro should be used alongside reduced-calorie diet and increased physical activity for best results.
- 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 Mounjaro cost per month in the UK privately?
Private Mounjaro KwikPen costs typically range from £129 to £320 per month depending on dose. Starting dose (2.5 mg) costs around £129–£150, while maximum dose (15 mg) costs approximately £280–£320. Each KwikPen contains four weekly injections, so monthly cost reflects a four-week supply at your current dose.
Is Mounjaro available free through the NHS in the UK?
Yes, Mounjaro is available free through NHS specialist tier 3 weight management services for eligible patients. Access requires referral from your GP to your local specialist service. Availability and waiting times vary significantly by region — some areas have long waiting lists, whilst others may have limited provision.
What affects the price of Mounjaro in the UK?
Mounjaro cost is determined by your current dose (prices increase as you titrate up from 2.5 mg to 15 mg), whether you access through NHS or private prescribing, your chosen private provider (if going private), and regional NHS availability. Using the BMI calculator on this page can help you understand eligibility factors.
How do I get Mounjaro on the NHS in the UK?
Ask your GP for a referral to your local NHS tier 3 specialist weight management service. You must meet eligibility criteria: BMI of 30 or above, or BMI of 27–29.9 with weight-related health conditions. Assessment and prescribing happen within the specialist service. Waiting lists vary by region.
Can I switch from NHS to private Mounjaro prescribing?
Yes, you can move between NHS and private prescribing, though any transition should be discussed with your current prescriber. If accessing privately after NHS, ensure continuity by discussing your dose and any side effects you've experienced. A new private prescriber will conduct their own clinical assessment before issuing a new prescription.
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.