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
Mounjaro Price List — What You'll Pay in the UK
Mounjaro (tirzepatide) pricing in the UK depends entirely on whether you access it through the NHS or a private prescription. The NHS does not publish fixed prices for medications — costs are managed through NHS contracts. Private pricing varies by provider, typically ranging from £129 to £320 per month depending on your dose. Understanding your eligibility route and what affects pricing helps you plan ahead for this prescription-only weight management treatment.
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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 Eligibility Criteria
NHS access to Mounjaro is available through tier 3 specialist weight management services, not through standard GP prescription. You'll need referral from your GP to a specialist multidisciplinary weight management team, which may involve a waiting list depending on your local integrated care board (ICB).
Eligibility for NHS Mounjaro:
- BMI of 30 kg/m² or above, or BMI of 27–29.9 kg/m² with weight-related health conditions
- Lower thresholds apply for South Asian, Chinese, Black African, and Black Caribbean adults (BMI 27.5+)
- Age 18 and over
- Not pregnant or breastfeeding
- No contraindications (e.g., personal or family history of thyroid cancer)
If eligible, the NHS funds Mounjaro as part of specialist tier 3 services — you would not pay a prescription charge beyond your standard NHS prescription fee (currently £9.90 in England). NICE has approved tirzepatide for use within these services, but regional availability varies significantly. Check with your local weight management service about current provision and waiting times.
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.
Private Prescription Costs and Pricing Factors
Private Mounjaro pricing typically ranges from £129 to £320 per month, depending on your dose and the provider. Each KwikPen contains 4 weeks' supply (4 injections) of a single dose.
Factors affecting price:
- Dose strength: Starting doses (2.5 mg) are usually cheaper than maintenance doses (15 mg)
- Provider: GPhC-registered online pharmacies set their own pricing
- Assessment fee: Some providers charge a separate online consultation fee (typically £15–£50)
- Bulk ordering: Some providers offer discounts for 3 or 6-month supplies
Private prescriptions require an online clinical assessment with a UK-licensed prescriber. Compare prices across providers — the same dose can vary significantly. Use our GLP-1 weight loss calculator to estimate your projected dose escalation and total treatment costs before committing.
- 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 on the NHS?
The NHS does not publish fixed medication prices. Through tier 3 specialist services, Mounjaro is funded by the NHS — you pay only the standard prescription charge (£9.90 in England). However, NHS availability varies by region and waiting times can be lengthy. Contact your local ICB weight management service for current access information.
What's the price difference between Mounjaro and Wegovy?
Private pricing is similar — both typically range from £129 to £320 per month depending on dose. Mounjaro (tirzepatide) has a dual GIP/GLP-1 mechanism and reaches a higher maximum dose (15 mg) compared to Wegovy's 2.4 mg. Compare Mounjaro vs Wegovy pricing with your chosen provider, as both availability and cost vary.
Does the cost include the injection pen and needles?
Yes. The price includes the KwikPen device (which contains 4 weeks of injections at your prescribed dose) and pre-attached needles. You do not pay separately for needles or injection equipment. Each new dose strength requires a new prescription and pen.
Can I get Mounjaro cheaper by paying upfront for multiple months?
Some private providers offer discounts for 3 or 6-month supplies purchased upfront. Ask your pharmacy whether bulk ordering discounts are available. NHS prescriptions are dispensed monthly as standard through specialist services, so upfront payment discounts don't apply.
Is Mounjaro available privately without an NHS referral?
Yes. Private prescription Mounjaro is available through GPhC-registered online pharmacies following an online clinical assessment — you do not need an NHS referral or to wait for specialist services. Private access is faster but costs more than NHS provision. Use our BMI calculator to confirm your eligibility before starting a private consultation.
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.