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 Per Month in the UK?
Mounjaro (tirzepatide) costs vary significantly in the UK depending on whether you access it through the NHS or privately. Private monthly costs typically range from £129 to £320, depending on your dose and the provider. NHS availability is limited and accessed through specialist tier 3 weight management services, with no direct patient cost if prescribed. Understanding the pricing structure helps you plan treatment and explore your options with your GP or healthcare provider.
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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 Pricing by Dose
Private Mounjaro costs in the UK vary by starting dose and escalation schedule:
- 2.5 mg (starter dose): approximately £129–£150 per month
- 5 mg: approximately £149–£180 per month
- 7.5 mg: approximately £180–£210 per month
- 10 mg: approximately £200–£250 per month
- 15 mg (maximum dose): approximately £280–£320 per month
These are approximate ranges and vary between GPhC-registered online pharmacies. Each KwikPen contains 4 weeks of doses, so monthly cost reflects a standard 4-week supply. Prices may include the consultation fee with a UK-licensed prescriber, or this may be charged separately (typically £30–£60). Always confirm the total cost including any prescriber fees before purchasing.
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 Cost Considerations
Mounjaro is available through NHS specialist weight management services (tier 3) at no direct cost to patients if prescribed. However, NHS access is limited and varies significantly by region. You typically need a GP referral to specialist services, and waiting lists can be lengthy in many areas. If you cannot access Mounjaro through the NHS in your area, private prescription is an alternative. Use our free GLP-1 weight loss calculator to explore potential outcomes, and discuss both NHS and private options with your GP to find the right route for you.
- 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.
Does the NHS prescribe Mounjaro, and if so, is it free?
Yes, NICE has approved tirzepatide (Mounjaro) for use within NHS specialist weight management services. If prescribed through the NHS, there is no direct cost to patients. However, availability varies by region and waiting lists can be long. You need a GP referral to specialist tier 3 services.
Why do private Mounjaro costs vary between pharmacies?
Private costs vary due to prescriber consultation fees, pharmacy markups, and competitive pricing. Some providers include the consultation in the quoted price, while others charge separately. Always ask for a total cost breakdown including any consultation or delivery fees.
Is the KwikPen price monthly or for a larger supply?
Each Mounjaro KwikPen contains 4 doses (4 weeks of once-weekly injections), so the quoted price is typically for a monthly supply. When you increase your dose, you may need to purchase a new pen, which could affect your monthly cost.
Can I get a cheaper Mounjaro alternative on the NHS?
Wegovy (semaglutide) is also available through NHS specialist services and may be offered depending on your assessment. Liraglutide (Saxenda), a daily GLP-1 injection, is another NHS option. Your prescriber will assess which medication suits you best.
How long do people typically use Mounjaro and does cost accumulate?
Mounjaro is typically used long-term for weight management. If weight loss is achieved, many people continue the medication to maintain results. This means ongoing monthly costs should be factored into your budget. Discuss duration and long-term costs with your prescriber.
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.