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
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Mounjaro Price Comparison — NHS vs Private in the UK
If you're considering Mounjaro (tirzepatide) for weight management in the UK, understanding the cost difference between NHS and private prescribing is essential. The price you pay — or whether you pay at all — depends entirely on your route of access. This guide breaks down NHS funding, private costs, and what affects the final price you'll face.
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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.
How Much Does Mounjaro Cost on the NHS?
On the NHS, Mounjaro is provided free at the point of care if you meet eligibility criteria and are referred through a tier 3 specialist weight management service. Your only cost would be a standard prescription charge (£9.90 per item in England as of 2024, or free if you're exempt). However, NHS access is highly variable — not all regions fund Mounjaro, and waiting lists can be extremely long. Some integrated care boards (ICBs) have restricted access, prioritising patients with type 2 diabetes or significant obesity-related health conditions. Demand far exceeds current supply through NHS services, meaning many people wait months or even years for specialist assessment. Regional postcode lottery is a real issue; your eligibility and speed of access depend heavily on where you live. Always check with your local NHS weight management service for current availability in your area.
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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 Costs and Factors Affecting Price
Private Mounjaro prescribing costs between approximately £129 and £320 per month depending on your dose and provider. Dose titration affects price — starting doses (2.5–5 mg) cost less than maintenance doses (10–15 mg). A full month of treatment typically means a single KwikPen (containing 4 weeks of injections). Private providers charge for both the clinical assessment and the medication. Some offer subscription models with discounts, others charge per month. Use our GLP-1 weight loss calculator to estimate potential weight loss at different doses, helping you weigh cost against expected outcomes. Private access avoids NHS waiting lists but requires upfront payment and is not available through standard GP prescriptions.
- 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 free on the NHS in the UK?
Mounjaro is free on the NHS if you meet eligibility criteria and are accepted by a tier 3 specialist weight management service — you'd only pay a standard prescription charge (£9.90 in England, or free if exempt). However, NHS access is extremely limited and varies by region. Many areas have restricted funding, long waiting lists, or are not currently prescribing Mounjaro at all.
What is the average private cost of Mounjaro in the UK?
Private Mounjaro typically costs £129–£320 per month, depending on your dose and provider. Starting doses (2.5–5 mg) are cheaper; maintenance doses (10–15 mg) are more expensive. This is a full month's supply (one KwikPen containing 4 injections). Prices may include the clinical assessment fee.
Why does Mounjaro cost more at higher doses?
Each KwikPen contains four doses of the same concentration. Higher-dose pens (10 mg, 12.5 mg, 15 mg) cost more to manufacture and supply than lower-dose pens (2.5 mg, 5 mg). You progress through doses gradually over 16+ weeks, so your monthly cost increases as you titrate upwards.
How can I access Mounjaro through the NHS?
Ask your GP for a referral to your local tier 3 specialist weight management service. You'll need to meet eligibility criteria: BMI ≥30, or BMI 27–29.9 with weight-related health conditions. However, availability is severely limited in most regions, and you may not be accepted or may face a very long waiting list.
Is private Mounjaro cheaper than Wegovy?
Costs are similar — both typically range £129–£320 per month privately. The exact price depends on your dose, provider, and whether you're on a subscription or pay-per-month model. Compare costs across providers before committing, as prices vary significantly.
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.