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 price in the UK depends on whether you access it through the NHS or privately. If prescribed through NHS specialist weight management services, there is no direct medication cost beyond your standard prescription charge (£9.90 in England as of 2024). Private prescription costs typically range from £129 to £320 per month depending on your dose and the provider. Understanding your options helps you make an informed decision about weight loss treatment in the UK.
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.
NHS Mounjaro Access and Costs
NHS prescription charge: £9.90 per prescription in England (one KwikPen = 4 weeks supply = one prescription charge). Costs vary in Scotland, Wales, and Northern Ireland.
NHS eligibility: Access through NICE-approved tier 3 specialist weight management services. You must be referred by your GP, though waiting lists vary significantly by region — some areas have multi-month waits. Eligibility requires a BMI of 30 kg/m² or above, or 27–29.9 kg/m² with weight-related health conditions (type 2 diabetes, hypertension, cardiovascular disease, sleep apnoea). South Asian and Black African/Caribbean adults may be eligible at lower BMI thresholds (27.5 kg/m² and above). Use our free BMI calculator above to check if you meet typical NHS eligibility criteria.
NICE approval: The National Institute for Health and Care Excellence (NICE) has approved tirzepatide for use within NHS weight management services, making it available on prescription rather than requiring direct private purchase.
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 Mounjaro Prescription Costs
Private prescription price range: £129–£320 per month, depending on your dose. Starting doses (2.5 mg) are at the lower end; maximum doses (15 mg) are at the higher end. You'll need a clinical assessment from a UK-licensed prescriber, usually conducted online, followed by dispensing through a GPhC-registered pharmacy.
Private advantages: No NHS referral required, faster access (often within days rather than months), choice of dose and provider. Private disadvantages: Full cost borne by you, no NHS subsidy, ongoing expense if continuing long-term.
Try our free GLP-1 weight loss calculator to estimate potential results at different doses, helping you weigh costs against expected outcomes.
Total cost comparison: On NHS, you pay £9.90 per prescription (4 weeks). If you're on a higher dose or take Mounjaro for a year, NHS cost = approximately £515 annually. Private cost at average dose = approximately £1,500–£2,400 annually. Many people combine private access initially with NHS options once eligible, or use private provision whilst waiting for NHS specialist assessment.
- 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 free on the NHS?
Yes, if prescribed through a NICE-approved NHS tier 3 specialist weight management service. You'll pay only the standard prescription charge (£9.90 per KwikPen in England), not the medication cost itself. Access is through GP referral, but availability and waiting times vary by region.
How much does Mounjaro cost privately in the UK?
Private Mounjaro typically costs £129–£320 per month depending on your dose (2.5 mg to 15 mg). This covers the prescription, clinical assessment, and pharmacy dispensing. Total annual cost ranges from approximately £1,500–£2,400 depending on whether you're on a starting or maintenance dose.
What's the difference between NHS and private Mounjaro prescriptions?
NHS prescriptions cost £9.90 per supply and are accessed through specialist services (requiring GP referral and meeting eligibility criteria). Private prescriptions cost significantly more but offer faster access without waiting for NHS appointments. Both require prescriptions from UK-licensed prescribers and delivery by regulated pharmacies.
How do I get Mounjaro on the NHS in the UK?
Ask your GP for a referral to your local tier 3 specialist weight management service. You must meet NICE eligibility criteria: BMI 30 or above, or 27–29.9 with weight-related health conditions. Your regional NHS service will then assess you and manage your prescription if approved.
Can I switch between NHS and private Mounjaro prescriptions?
Yes, many people start privately whilst waiting for NHS assessment, then transition to NHS prescriptions once approved by specialist services. Always inform your GP and NHS provider about any private treatment, and ensure your prescriber coordinates care to avoid safety issues or duplicate doses.
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.