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 a prescription-only weight loss injection available in the UK through both NHS specialist services and private prescribers. The cost varies significantly depending on whether you access it privately or through the NHS, your dose, and your region. This guide explains the real costs, how to access Mounjaro in the UK, and what to expect from both routes. Use our free GLP-1 weight loss calculator above to see how Mounjaro might work for your situation, alongside your BMI calculator results.
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.
Mounjaro UK Private Cost and Pricing
Private Mounjaro costs in the UK typically range from £129 to £320 per month, depending on your dose and the prescribing service you choose. Each KwikPen contains four weeks of doses, so monthly costs cover a full month's treatment. Starting doses (2.5 mg) are usually at the lower end, while maximum doses (15 mg) are at the higher end. Some services offer tiered pricing, with discounts available for repeat prescriptions or upfront payment for multiple months. Private access requires an online consultation with a UK-licensed prescriber who will assess your eligibility based on your BMI, health history, and any weight-related conditions. The entire process—from consultation to receiving your first KwikPen—typically takes 2–5 working days. No GP referral is required for private access, making it faster than NHS routes in most regions.
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 vs Private: Which Route Is Right for You?
On the NHS, Mounjaro is available through specialist tier 3 weight management services, but access varies dramatically by region. You'll need a GP referral to a local NHS weight management clinic, though waiting lists in many areas are extremely long—sometimes 12 months or more. When available on the NHS, Mounjaro is provided free on prescription (no NHS charge for the medication itself, though you pay standard prescription fees). However, NHS availability depends on your local Integrated Care Board (ICB) funding and commissioning decisions. Private access is faster and doesn't require NHS referral, but you pay the full cost. Consider your BMI and health circumstances using our free BMI calculator to understand your eligibility, then discuss both NHS and private options with your GP. Some people use private access initially while waiting for NHS services, then switch if NHS treatment becomes available.
- 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.
What's the average monthly cost of Mounjaro in the UK?
Private Mounjaro costs typically range from £129–£320 per month depending on dose. Starting doses (2.5–5 mg) are usually £129–£180/month, mid-range doses (7.5–10 mg) around £200–£260/month, and maximum doses (15 mg) around £280–£320/month. Prices vary between UK prescribing services. On the NHS, there's no medication cost (except standard prescription fees) but access is limited and waiting lists are often very long.
Do I need a GP referral to get Mounjaro privately in the UK?
No. Private Mounjaro requires an online consultation with a UK-licensed prescriber but not a GP referral. The prescriber will assess your eligibility based on BMI, health history, and any weight-related conditions. You can access private prescription services directly without NHS involvement, which is why this route is often faster than waiting for NHS specialist services.
How is Mounjaro accessed on the NHS in the UK?
You need a GP referral to a specialist tier 3 weight management service in your area. Eligibility typically requires a BMI of 30 or above (or 27+ with weight-related health conditions). NHS access is free on prescription, but availability depends on your local Integrated Care Board funding. Waiting lists can be very long—sometimes many months—and access varies significantly by region.
What's included in the monthly cost of Mounjaro?
The monthly cost covers one KwikPen, which contains four pre-filled doses (one week each). This covers a full month of once-weekly injections. Additional costs may include the initial consultation fee (if private) and any follow-up consultations, though many private services offer follow-up support at no extra charge. Storage and disposal are your responsibility.
Are there any additional costs to consider with Mounjaro?
Beyond the monthly medication cost, consider consultation fees (private access only—typically £20–£50 for initial assessment), follow-up appointments (may be included or charged separately), and GP appointments to discuss your treatment. If you experience side effects requiring additional GP visits or tests, these may incur standard NHS charges. Always clarify what's included in your prescribing service's pricing upfront.
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.