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 Tracker App: UK Cost and Access Options
If you're considering Mounjaro (tirzepatide) for weight management in the UK, understanding the cost and access routes is essential. This guide explains how to get Mounjaro through both NHS and private prescriptions, what you can expect to pay, and how to track your progress safely throughout your treatment journey.
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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.
Private Mounjaro Costs and Access in the UK
Mounjaro is available through private prescription in the UK via licensed online prescribing services. Private costs typically range from £129 to £320 per month, depending on your starting dose and the service provider. The KwikPen device contains four weekly doses, so one pen covers approximately four weeks of treatment.
Costs vary because Mounjaro requires dose titration — you start at 2.5 mg and gradually increase over several weeks to reach your maintenance dose (typically 5 mg to 15 mg). Lower starting doses cost less than higher maintenance doses. When accessing Mounjaro privately, you'll need an online consultation with a UK-licensed prescriber who will assess your eligibility based on your BMI, health conditions, and medical history. The prescriber will determine the appropriate starting dose for you, which affects your initial cost. Use our free GLP-1 weight loss calculator to estimate potential weight loss at different doses, which can help inform your discussions with your prescriber about the right dose for your goals.
Private prescriptions are typically dispensed by GPhC-registered online pharmacies within 2–5 working days. This route offers faster access than NHS services, with no referral needed — you can start the online assessment process immediately.
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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 Mounjaro Access
NHS access: Mounjaro is available through NHS specialist tier 3 weight management services following NICE approval, but access is highly variable by region. You'll need a GP referral to a specialist weight management service in your area. Waiting times can range from several weeks to over a year in some regions. If approved by the NHS, treatment is free on prescription.
Private access: Available without NHS referral through online clinical consultations. Faster approval (typically 24–48 hours), but you pay privately. Both routes require a valid clinical assessment to confirm you meet eligibility criteria (BMI 30+, or BMI 27+ with weight-related health conditions like type 2 diabetes or hypertension). Your prescriber will also recommend lifestyle changes — diet and exercise — alongside medication for best results. Track your progress with our free progress tracker to monitor weight changes, dose adjustments, and health improvements over time.
- 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 private prescription in the UK?
Private Mounjaro costs between £129 and £320 per month, depending on your dose. Lower starting doses (2.5 mg) cost less than higher maintenance doses (15 mg). One KwikPen contains four weekly injections, so one pen lasts approximately four weeks.
Can I get Mounjaro free on the NHS?
Yes, Mounjaro is available free through NHS specialist weight management services, but access varies significantly by region. You'll need a GP referral and may face waiting lists of several months to over a year. Private prescription is faster but costs £129–£320 monthly.
What's the difference between Mounjaro and Wegovy?
Both are prescription-only weight loss injections available in the UK. Mounjaro (tirzepatide) is a dual GIP and GLP-1 agonist with a maximum dose of 15 mg weekly. Wegovy (semaglutide) is a GLP-1 agonist with a maximum dose of 2.4 mg weekly. Clinical trials showed Mounjaro may produce slightly higher average weight loss, though individual results vary.
Do I need a GP referral for private Mounjaro?
No. Private Mounjaro access bypasses NHS referral — you can book an online consultation directly with a licensed UK prescriber. They'll assess your eligibility (BMI, health conditions, medications) and issue a prescription if appropriate. The whole process typically takes 24–48 hours.
What is dose titration and how does it affect Mounjaro cost?
Dose titration means gradually increasing your dose over 16–20 weeks, starting at 2.5 mg and potentially reaching 15 mg. Your prescriber determines the schedule. Titration spreads costs across several months and helps your body adjust, reducing side effects. Your KwikPen dose determines monthly cost.
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.