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 UK Prices — What You Need to Know
Mounjaro (tirzepatide) pricing in the UK depends on how you access it. If prescribed through NHS specialist weight management services, you pay nothing at the point of use — though NHS availability varies significantly by region. For private prescription access, costs typically range from £129 to £320 per month depending on your dose and the provider. Understanding your eligibility and options can help you find the right route for your situation.
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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 for Mounjaro
NICE approved Mounjaro for use within NHS tier 3 specialist weight management services in 2024. If eligible and referred to your local service, treatment is free on the NHS — you pay nothing for the prescription or injection.
NHS eligibility requires:
- BMI of 30 or above, or BMI of 27–29.9 with weight-related health conditions (type 2 diabetes, prediabetes, high blood pressure, sleep apnoea, or cardiovascular disease)
- For South Asian, Chinese, Black African, or Black Caribbean adults, lower thresholds may apply (BMI 27.5+)
- Referral to a tier 3 specialist service from your GP
However, NHS availability is patchy across the UK. Some regions have waiting lists of months or years; others have limited capacity. Ask your GP about your local service availability and expected timescales before requesting a referral.
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 Prescribing and Costs
Private prescription access for tirzepatide doesn't require NHS referral. A UK-licensed prescriber conducts an online clinical assessment and, if appropriate, issues a prescription to a GPhC-registered pharmacy.
Private pricing (approximate): £129–£180 per month for starting doses (2.5–5 mg), and £200–£320 per month for higher maintenance doses (10–15 mg). Some providers offer payment plans or dose-stacking (paying for multiple pens upfront). Costs vary by provider, so comparing quotes is worthwhile. Unlike the NHS route, private access is typically faster — often within days of assessment rather than months.
Both NHS and private routes require a clinical assessment to confirm you're medically suitable. Your prescriber will review your weight, BMI, health conditions, medications, and any contraindications. Use our free BMI calculator above to check your starting point, and our GLP-1 weight loss calculator to estimate potential outcomes at different Mounjaro doses. This gives you a clear picture before speaking to a GP or pursuing private 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.
Does the NHS prescribe Mounjaro in all regions?
No. NICE approved Mounjaro for NHS use, but availability depends on your local integrated care board (ICB) and tier 3 specialist services capacity. Some regions have waiting lists of many months or years; others have limited funding. Contact your GP to ask about your local service.
What's the difference between NHS and private Mounjaro prescribing?
NHS: free at point of use if referred to specialist services, but long waiting lists in many areas. Private: faster access (days vs months), no NHS referral needed, but you pay £129–£320/month depending on dose. Both require clinical assessment to confirm suitability.
Are private Mounjaro prices fixed across all providers?
No. Prices vary by provider, dose, and any bundle offers. Most private providers charge roughly £129–£180/month for starting doses and £200–£320/month for maintenance doses. It's worth checking 2–3 providers and asking about any payment plans before committing.
Can I switch from private Mounjaro to NHS prescribing later?
Potentially, but it depends on NHS waiting lists and your local ICB policy. Some people start privately to avoid long NHS delays, then may request a GP referral later. Discuss this with your GP or private prescriber — they can advise on your specific situation.
What does "dose titration" mean and how does it affect Mounjaro costs?
Dose titration means gradually increasing your dose every 4 weeks (2.5 mg → 5 mg → 7.5 mg, etc., up to 15 mg). You'll need a new KwikPen for each dose level, so costs increase as you titrate. Most people take 4–20 weeks to reach their maintenance dose, during which monthly costs gradually rise.
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.