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 and private routes, with significantly different costs depending on your access method. The price varies based on your dose and whether you obtain the medication through specialist NHS services or a private online prescriber. Understanding your options helps you make an informed decision about treatment access and affordability.
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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 in the UK
Private tirzepatide prescriptions are available through UK-licensed online prescribers without NHS referral, though they do require a clinical assessment. Private costs typically range from £130 to £320 per month, depending on your dose and the provider you use. Starting doses (2.5 mg) are usually at the lower end of this range, while maximum doses (15 mg) cost more. Each KwikPen contains four weekly injections, making private treatment a monthly commitment. As a GIP receptor agonist (dual-action mechanism), Mounjaro is often priced similarly to other GLP-1 receptor agonist alternatives. Online consultations are usually free or included in the service, and prescriptions are dispensed by GPhC-registered pharmacies. Private access is faster than NHS routes — many patients receive their first dose within 1–2 weeks of consultation. Costs are not usually covered by standard health insurance, though some private health insurance plans may provide coverage — check your policy.
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 Route
NHS access to Mounjaro is free at the point of use but is only available through tier 3 specialist weight management services. You must be referred by your GP and meet specific BMI criteria (typically BMI ≥30, or BMI 27–29.9 with weight-related health conditions). Availability varies significantly by region — some areas have waiting lists of 6–12 months or longer. Once prescribed through the NHS, the medication itself costs nothing, though you may pay standard prescription charges (currently £9.90 per item in England). Private access is faster but costs money upfront — no waiting for NHS referral, payment required immediately. If cost is a barrier, ask your GP about NHS eligibility and local waiting times first. Some people choose private treatment for speed while others prefer the NHS route. Use our free GLP-1 weight loss calculator to estimate potential results with Mounjaro at different doses, helping you decide if treatment is worth your investment.
- 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 on the NHS?
Mounjaro is free on the NHS. You only pay the standard prescription charge (£9.90 per item in England, £5 in Wales, varies in Scotland and Northern Ireland) unless you're eligible for free prescriptions due to age, health conditions, or low income.
Is there a significant difference between NHS and private Mounjaro pricing?
Yes. NHS is free (except prescription charges). Private costs £130–£320/month depending on dose. Private is significantly more expensive but faster — no waiting lists. NHS is free but may involve months of waiting through specialist services.
Can private health insurance cover Mounjaro costs in the UK?
Some private health insurance policies cover Mounjaro, but most standard policies do not. Check your specific policy documents or contact your insurer directly. Many patients pay out-of-pocket for private tirzepatide prescriptions.
Why does private Mounjaro cost more than some weight loss injections?
Mounjaro's dual mechanism (GIP and GLP-1 receptor agonist) may justify higher pricing. Results in clinical trials were strong, but prices also reflect market demand and supply. Individual private providers set their own fees within typical ranges.
What's included in private Mounjaro costs — is the consultation separate?
Most private prescribers include the online consultation free or as part of the service. The monthly cost quoted (£130–£320) typically covers the prescription, clinical assessment, and dispensing. Some providers charge separately for follow-up consultations.
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.