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
What's the Cheapest Mounjaro Price in the UK?
Mounjaro (tirzepatide) pricing in the UK varies significantly depending on whether you access it through the NHS or privately. Private prescription costs typically range from £129–£320 per month depending on your dose, while NHS access is available through specialist weight management services but with regional variation and potential waiting lists. Understanding your options helps you find the most affordable and accessible 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.
Private Mounjaro Pricing & Cost Factors
Private prescription costs for Mounjaro typically range from £129 to £320 per month, depending on which dose you're prescribed and the online clinic you use. Costs are higher at lower starter doses (2.5 mg and 5 mg) and lower per-dose at higher maintenance doses (10 mg, 12.5 mg, and 15 mg). Each Mounjaro KwikPen contains four pre-filled pens representing four weeks' supply.
- Starting doses (2.5 mg–5 mg): typically £150–£180 per month
- Mid-range doses (7.5 mg–10 mg): typically £180–£240 per month
- Higher doses (12.5 mg–15 mg): typically £240–£320 per month
Private costs depend on the online clinic, your chosen prescriber, and your dose titration schedule. Most private providers require an initial online consultation (usually £20–£50) before issuing a prescription. Some clinics offer bundle pricing or subscription discounts when you commit to longer treatment periods.
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 Routes: How to Access Mounjaro
NHS access to Mounjaro is available through specialist weight management services but requires referral from your GP and is subject to regional availability through your local Integrated Care Board (ICB). NICE approved tirzepatide for NHS use, but waiting lists in many areas are lengthy—sometimes months or years.
Private access is faster: complete an online consultation with a UK-licensed prescriber, receive a prescription if clinically appropriate, and collect from a GPhC-registered pharmacy—usually within 24–48 hours. Private route eligibility follows similar criteria (BMI ≥30, or ≥27 with weight-related health conditions) but doesn't require NHS referral or waiting lists. Your GP can advise which route suits your situation best.
- 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 the UK?
Yes, tirzepatide (Mounjaro) is approved by NICE for NHS weight management services. Access is through specialist tier 3/4 weight management services via GP referral. Availability and waiting times vary significantly by region (ICB). Some areas have established pathways; others have long waiting lists.
What's the average cost of Mounjaro privately per month?
Private Mounjaro costs typically range from £129–£320 per month depending on dose. Starting doses (2.5–5 mg) are cheaper than higher maintenance doses (12.5–15 mg). Each prescription includes a four-week supply (one KwikPen with four doses).
How does Mounjaro dosing affect the total monthly cost?
You begin at 2.5 mg and typically increase every four weeks until reaching your effective maintenance dose (often 10–15 mg). Lower starting doses cost less monthly, but maintenance doses are more expensive. Total cost depends on how long you remain at each dose before titrating up.
Can I get Mounjaro without NHS referral?
Yes, through private online clinics. You complete an online consultation with a UK-licensed prescriber, who assesses your eligibility. If approved, you receive a prescription dispensed by a GPhC-registered pharmacy. This route is faster than NHS (24–48 hours) but costs more.
What does an online Mounjaro consultation cost?
Initial consultations with private prescribers typically cost £20–£50. Some clinics include this in your first prescription cost; others charge separately. Ongoing prescriptions usually don't require new consultations unless you're changing doses or need annual review.
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.