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
What Does Mounjaro Cost in the UK?
Mounjaro (tirzepatide) pricing in the UK varies significantly depending on whether you access it through the NHS or privately. NHS specialist weight management services may offer Mounjaro at no direct cost to eligible patients, while private online prescriptions typically range from £129 to £320 per month depending on your dose and the provider. Understanding your options and eligibility can help you make an informed decision about accessing this prescription weight loss injection.
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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.
Mounjaro Pricing by Access Route
NHS Access: If you qualify for Mounjaro through an NHS specialist tier 3 or tier 4 weight management service, the cost is covered by the NHS — you pay only your standard prescription charge (currently £9.90 per item in England). However, NHS access is limited: specialist services have long waiting lists in many regions, and availability varies significantly by Integrated Care Board (ICB). Your GP can refer you to your local specialist service.
Private Online Prescription: Private GPhC-registered online pharmacies typically charge between £129 and £320 per month for Mounjaro, depending on your dose. These costs usually include the prescription assessment, the medication itself, and delivery. At higher doses (10–15 mg), costs approach the upper end of this range. No NHS referral is required for private access — you complete an online clinical assessment and receive a prescription if clinically appropriate.
- 2.5–5 mg starter doses: approximately £129–£180/month
- 7.5–10 mg maintenance doses: approximately £200–£260/month
- 12.5–15 mg maximum doses: approximately £280–£320/month
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 vs Private — What's Right for You?
Choose NHS if: You qualify for tier 3 specialist services and can access them, you prefer NHS-supervised treatment, and waiting times are acceptable in your area. Use our free GLP-1 weight loss calculator to explore potential outcomes while you wait.
Choose private if: You need faster access, your NHS waiting list is very long, or you prefer the convenience of online assessment. Private prescriptions require a valid UK prescription from a licensed prescriber and dispensing by a GPhC-registered pharmacy — ensure any provider you use is properly registered.
Important: Mounjaro is prescription-only and requires a clinical assessment. Neither NHS nor private access assures prescription — you must meet eligibility criteria (BMI 30+, or 27+ with weight-related health conditions) and have no medical contraindications.
- 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 available on the NHS in the UK?
Yes, NICE has approved tirzepatide (Mounjaro) for NHS use in specialist weight management services. However, availability varies by region and waiting lists can be very long. You'll need a GP referral to a tier 3 or tier 4 specialist service. Ask your GP about local availability and waiting times in your area.
How much does Mounjaro cost privately in the UK?
Private Mounjaro costs typically range from £129 to £320 per month depending on your dose. Lower starting doses (2.5–5 mg) cost around £129–£180/month, while maximum doses (12.5–15 mg) cost £280–£320/month. Prices may vary between different private providers and pharmacies.
What's included in the private Mounjaro price?
Private pricing typically includes the online clinical assessment, the prescription if approved, the Mounjaro KwikPen medication itself, and delivery to your address. Some providers may offer additional support or follow-up consultations. Check the breakdown with your chosen provider before purchasing.
How does Mounjaro pricing compare to Wegovy?
Both Mounjaro and Wegovy typically cost between £129 and £320 per month privately, though exact pricing varies by provider and dose. Mounjaro may have slightly different costs at equivalent doses. Ask providers for specific pricing at your intended dose before committing.
Why does Mounjaro cost more at higher doses?
The cost difference reflects the medication dosage — higher doses contain more active ingredient (tirzepatide). Starting doses like 2.5 mg cost less than maintenance doses like 10 mg or maximum doses like 15 mg. Your prescriber will recommend a dose based on your health and response to treatment.
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.