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 Prices in the UK — What You Need to Know
Mounjaro (tirzepatide) pricing in the UK varies significantly depending on whether you access it through the NHS or privately. NHS access is free at the point of use for eligible patients through specialist tier 3 weight management services, though availability and waiting times vary by region. Private prescriptions typically cost between £150 and £320 per month depending on your dose and the provider. Understanding the current pricing landscape, eligibility criteria, and access routes can help you make an informed decision about weight management options available to you 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 Access and Costs for Mounjaro in the UK
NHS access to Mounjaro is free for eligible patients, but it is only available through specialist tier 3 weight management services, not standard GP prescription. Access is patchy across the UK, with some ICBs (Integrated Care Boards) offering it while others have long waiting lists or no current availability.
Eligibility criteria for NHS Mounjaro:
- BMI of 30 kg/m² or above (obesity), or
- BMI of 27–29.9 kg/m² (overweight) with at least one weight-related health condition such as type 2 diabetes, prediabetes, high blood pressure, or sleep apnoea
- For South Asian, Chinese, Black African, or Black Caribbean adults, lower thresholds may apply (from BMI 27.5)
To access NHS tirzepatide, you must be referred to your local tier 3 specialist weight management service by your GP. This typically involves a formal assessment and may require completion of tier 2 interventions first. NICE has approved tirzepatide for NHS use, but regional availability remains limited, and waiting times can be substantial in many areas.
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 Pricing and How to Access It
Private tirzepatide costs in the UK range from approximately £150 to £320 per month, depending on your dose and the online pharmacy provider. Lower starting doses (2.5–5 mg) are typically cheaper, while higher maintenance doses (10–15 mg) cost more.
Private access is through GPhC-registered online pharmacies following a clinical assessment with a UK-licensed prescriber. You do not need an NHS referral — prescriptions are issued if you meet clinical eligibility criteria. Private tirzepatide is available quickly (often within days), making it an option for people who cannot access NHS services or prefer faster initiation. You can use our free GLP-1 weight loss calculator to project potential results at different doses, and our BMI calculator to check whether you meet standard eligibility criteria.
- 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 my area?
NHS tirzepatide is available through some specialist tier 3 services, but availability varies significantly by region. Contact your GP to ask if your local Integrated Care Board (ICB) offers it, or search for your regional weight management service. Many areas have waiting lists of several months.
How much does Mounjaro cost privately in the UK?
Private Mounjaro costs between £150 and £320 per month, depending on your starting dose and maintenance dose. Lower doses (2.5–5 mg) cost around £150–£180, while higher doses (10–15 mg) cost £250–£320. Prices vary by provider.
What is the difference between NHS and private Mounjaro?
The medication is identical. The difference is access speed and cost. NHS is free but requires referral and may involve waiting lists. Private access is faster but costs £150–£320 monthly and requires an online clinical assessment with a UK-licensed prescriber.
What are the eligibility criteria for Mounjaro on the NHS?
You must have a BMI of 30 or above, or 27–29.9 with a weight-related health condition like type 2 diabetes or high blood pressure. South Asian, Chinese, Black African, or Black Caribbean adults may be eligible from BMI 27.5. Your GP assesses eligibility during the referral process.
How quickly can I access Mounjaro privately?
Private access is typically faster than NHS. After an online clinical assessment with a prescriber, prescriptions are usually issued within 24–48 hours if approved, and the medication is dispatched within days. NHS access can involve waiting lists of months in many regions.
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.