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) prices in the UK vary significantly depending on whether you access it through the NHS or privately. On the NHS, Mounjaro is free if prescribed through specialist weight management services, though availability varies by region. Private costs typically range from £150 to £350 per month depending on your dose. Understanding the pricing structure, eligibility criteria, and how to access Mounjaro can help you make an informed decision about weight management treatment. Use our GLP-1 weight loss calculator to explore potential outcomes before pursuing a prescription.
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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.
NHS access and private prescribing costs
NHS Mounjaro access: Tirzepatide (Mounjaro) is approved by NICE for use within NHS specialist tier 3 weight management services. If prescribed through the NHS, there is no prescription charge — you pay nothing. However, NHS access requires referral from your GP to a specialist weight management service, and availability varies significantly by region (ICB area). Many areas have substantial waiting lists, sometimes stretching months or years. You must meet NHS eligibility criteria: BMI of 30 kg/m² or above, or BMI 27–29.9 with weight-related health conditions like type 2 diabetes, cardiovascular disease, or hypertension.
Private Mounjaro costs: Through private online prescribing services, Mounjaro costs vary by dose and provider. Starting doses (2.5 mg) typically cost £150–£180 per month. Mid-range doses (7.5–10 mg) range from £200–£280 per month. Maximum dose (15 mg) may cost £300–£350 per month. These prices include the prescription assessment and the medication itself. Private prescribers are UK-licensed and GPhC-registered — you do not need an NHS referral.
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.
What affects Mounjaro pricing and how to access it
Several factors influence your final Mounjaro cost: the specific dose you require (determined during titration over 16–20 weeks), the provider you choose, and whether you opt for NHS or private access. Prices are also subject to change and may vary by supplier. Before starting Mounjaro, all providers require a clinical assessment — either through NHS specialist services or via a private online consultation — to confirm you are eligible and that the medication is appropriate for you. Your GP can discuss both NHS and private options. Using our BMI calculator can help establish your baseline before seeking a prescription, while our GLP-1 weight loss calculator helps you understand projected outcomes at different doses.
- 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.
Is Mounjaro free on the NHS?
Yes, Mounjaro is free if prescribed through NHS specialist weight management services. However, you must be referred by your GP and meet NHS eligibility criteria (BMI ≥30, or ≥27 with weight-related health conditions). Regional availability varies, and waiting lists can be long.
How much does Mounjaro cost privately in the UK?
Private Mounjaro costs typically range from £150–£350 per month depending on your dose. Starting dose (2.5 mg) is usually £150–£180. Maximum dose (15 mg) can be £300–£350. Prices vary by provider and include the clinical assessment.
What is the difference between NHS and private Mounjaro?
The medication is identical. The difference is access pathway and cost. NHS is free but requires GP referral and has waiting lists. Private is faster (typically 1–2 weeks) but involves a cost. Both require clinical assessment and a valid prescription.
Does Mounjaro cost the same at every private provider?
No, prices vary between UK online prescribing services. Costs may also differ based on dose and packaging. It is worth comparing providers, but always ensure they are GPhC-registered and employ UK-licensed prescribers.
Can I get Mounjaro without a prescription?
No, Mounjaro is prescription-only medicine. You must have a prescription from a UK-licensed prescriber — either through NHS specialist services or via private online consultation. All prescriptions are issued by qualified healthcare professionals following clinical assessment. ```
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.