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
How Much Does Mounjaro Cost in the UK?
Mounjaro (tirzepatide) is available in the UK through both NHS specialist services and private prescription routes, with costs varying significantly depending on your access pathway. If you're eligible, understanding the pricing structure and how to access this prescription weight loss injection can help you make an informed decision. Our GLP-1 weight loss calculator can help you estimate potential outcomes at different doses, whilst our BMI calculator shows whether you might meet eligibility criteria based on NHS guidelines.
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.
Private Mounjaro Costs in the UK
Private prescription pricing for Mounjaro typically ranges from £129 to £320 per month, depending on the dose you're prescribed and the provider you use. Costs increase with dose escalation:
- Lower doses (2.5–5 mg): approximately £129–£170 per month
- Mid-range doses (7.5–10 mg): approximately £170–£230 per month
- Higher doses (12.5–15 mg): approximately £240–£320 per month
Private access typically involves an online consultation with a UK-licensed prescriber, who will assess your eligibility based on your BMI, health history, and weight-related conditions. If approved, your prescription is dispensed by a GPhC-registered pharmacy. Many providers offer dose titration support and follow-up consultations. Costs do not include initial consultations, which may range from £20–£50 depending on the provider. Some services bundle consultations into ongoing care packages.
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.
NHS vs Private Access Routes
NHS access to Mounjaro is through tier 3 specialist weight management services, typically available free once prescribed, but availability varies significantly by region and waiting lists can be lengthy—sometimes 12 months or more. Your GP can refer you to your local specialist service, though not all areas have rapid access.
Private access is faster—prescriptions can be issued within 24–48 hours of online consultation—but requires out-of-pocket payment. Private options don't require NHS referral. Compare both routes: if you're eligible for NHS, waiting times may be acceptable; if you need faster access and can afford private costs, online prescribing offers immediate availability. Use our BMI calculator to check eligibility criteria, then discuss options with your GP or contact private providers directly for pricing.
- 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.
What's included in the Mounjaro monthly cost?
Private prescription costs typically cover the tirzepatide injection itself, dispensing, and basic support. Initial consultations, follow-up appointments, and dose adjustments may be charged separately or bundled depending on the provider. Always confirm what's included before purchasing.
Can I get Mounjaro on the NHS in the UK?
Yes, Mounjaro is NICE-approved for NHS use. Access is through tier 3 specialist weight management services. Your GP can refer you, but availability and waiting times vary by region. Some areas have waiting lists exceeding 12 months.
Are there cheaper alternatives to Mounjaro?
Wegovy (semaglutide) is another GLP-1 injection with similar private pricing (£129–£299/month). Saxenda (liraglutide) is a daily injection option. Compare effectiveness, dosing, and side effects with your prescriber to find the best option for you.
Do I need a GP referral for private Mounjaro?
No. Private prescriptions don't require NHS referral. You can contact a GPhC-registered online prescribing service directly, have an online consultation, and receive a prescription if clinically appropriate.
Is Mounjaro more expensive than Wegovy in the UK?
Pricing is similar—both range £129–£320/month depending on dose. Mounjaro's dual GIP/GLP-1 mechanism may produce different results than Wegovy's single GLP-1 action, but cost is comparable. Ask your prescriber about relative effectiveness for your situation.
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.