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 New Customer Offers in the UK
If you're considering Mounjaro (tirzepatide) for weight management, understanding how to access it and what it costs is essential. New customer offers and pricing vary significantly between NHS and private prescription routes in the UK. This guide explains your options, typical costs, eligibility requirements, and how the online prescription process works so you can make an informed decision about whether Mounjaro is right for you.
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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 in the UK?
Mounjaro pricing in the UK varies depending on whether you access it through the NHS or privately. Through the NHS, if you're eligible and referred to a specialist weight management service, there is no direct cost — however, NHS access is limited and waiting times can be lengthy in many areas.
For private prescription access, costs typically range from £129 to £320 per month, depending on your dose and the prescribing provider. The starting dose (2.5 mg) is usually at the lower end of this range, while higher doses (15 mg) cost more. Some private providers offer new customer discounts or introductory pricing, though availability varies. Each KwikPen contains four weekly injections, so monthly costs reflect a full month's supply. When comparing Mounjaro vs Wegovy pricing, tirzepatide is often slightly more expensive due to its dual GIP and GLP-1 mechanism, though individual costs depend on your chosen provider and dose titration schedule.
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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.
Accessing Mounjaro: NHS vs Private Routes
NHS access requires referral to a tier 3 specialist weight management service through your GP. You must meet NICE eligibility criteria (BMI ≥30, or BMI 27–29.9 with weight-related health conditions) and demonstrate commitment to lifestyle changes. Waiting lists vary significantly by region.
Private access is faster: you complete an online consultation with a UK-licensed prescriber, who assesses your eligibility and medical history. If approved, a prescription is issued and dispensed by a GPhC-registered pharmacy. No NHS referral is required. Use our free GLP-1 weight loss calculator to explore projected outcomes, and our BMI calculator to check your current BMI status before starting the consultation process.
Q1: What is included in Mounjaro new customer offers? A1: New customer offers vary by provider but typically include introductory pricing on starter doses (2.5 mg or 5 mg), discounts on your first month, or bundled consultations. Some providers offer reduced rates for the first few weeks, then standard pricing thereafter. Always check the terms — some offers require commitment to a minimum treatment duration. Compare offers carefully, as the lowest upfront cost may not represent the best value over 12 months. Q2: How do I know if I'm eligible for Mounjaro in the UK? A2: You're eligible if you have a BMI of 30 or above, or a BMI of 27–29.9 with at least one weight-related health condition (type 2 diabetes, high blood pressure, high cholesterol, sleep apnoea, or cardiovascular disease). Adults of South Asian, Chinese, Black African, or Black Caribbean heritage may have lower thresholds (BMI 27.5+). A prescriber will confirm eligibility during your online assessment. Q3: Can I switch from Wegovy to Mounjaro on a new customer offer? A3: Yes — if you're already on Wegovy, you can switch to Mounjaro through a private provider. Your prescriber will assess whether switching is appropriate and may offer transition support. Some providers offer competitive pricing to new customers switching from other GLP-1 medications. The dose conversion is approximate (Wegovy 2.4 mg ≈ Mounjaro 10 mg), and your prescriber will guide any dose adjustments. Q4: What happens after my new customer offer period ends? A4: After your introductory offer, you'll move to standard pricing, which reflects your current dose. As you titrate upwards (increasing your dose weekly or every few weeks), costs will increase incrementally. Many providers offer loyalty pricing or package discounts if you commit to longer treatment. Budget for ongoing monthly costs and factor this into your decision. Q5: Do I need a GP referral to access private Mounjaro? A5: No — private prescription access does not require NHS referral. You book an online consultation directly with a licensed prescriber, who conducts a full health assessment. However, if you prefer NHS access, you'll need your GP to refer you to a specialist weight management service, which involves a longer waiting period and stricter eligibility criteria.- 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 is BMI and how is it calculated?
BMI (Body Mass Index) is calculated by dividing your weight in kilograms by your height in metres squared. It's the standard screening tool used by the NHS to assess whether adults are a healthy weight.
Is BMI accurate for everyone?
BMI is a useful screening tool but doesn't account for muscle mass, bone density, or body fat distribution. Athletes may have a high BMI without excess fat. The NHS recommends using BMI alongside waist circumference for a more complete picture.
What are GLP-1 medications like Mounjaro and Wegovy?
GLP-1 receptor agonists are prescription medications that mimic gut hormones to reduce appetite and help with weight loss. Mounjaro (tirzepatide) and Wegovy (semaglutide) are the two most widely used for weight management in the UK.
Am I eligible for GLP-1 weight loss medication in the UK?
Generally, you need a BMI of 30+ (obese) or 27+ with a weight-related health condition. You must be 18 or over. Use our BMI calculator to check.
What is the difference between Mounjaro and Wegovy?
Mounjaro (tirzepatide) is a dual GIP/GLP-1 agonist with up to 22.5% weight loss. Wegovy (semaglutide) is GLP-1-only with up to 15-17% weight loss. Both are weekly injections.
Is this website free to use?
Yes, 100% free. No sign-up required. All tools work instantly in your browser and no personal data is stored on our servers.
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.