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
Diet Plan On Mounjaro — UK Cost & Access Guide
If you're considering Mounjaro (tirzepatide) for weight management in the UK, understanding how to access it and the costs involved is crucial. This guide covers the NHS and private routes to getting Mounjaro, what to expect during clinical assessment, and why diet remains essential alongside this prescription medication. Whether you're exploring private prescription options or waiting for NHS specialist services, we'll explain the realistic costs and access pathways available to UK adults.
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 Cost & Access in the UK
Private Mounjaro prescriptions in the UK are available through registered online prescribing services following an online clinical assessment. Costs vary by dose and provider, typically ranging from £150–£320 per month depending on which Mounjaro kwikpen dose you're prescribed (starting at 2.5 mg to maximum 15 mg weekly). The dose titration schedule means you'll spend 4 weeks on each dose level before escalating, so your initial course may cost less than the maximum dose equivalent. Diet quality matters significantly during this time — Mounjaro works by reducing appetite, but what you eat still determines your nutrient intake and sustainable weight loss outcomes. Many private providers bundle prescriptions with dietary guidance or nutrition support. You'll need a UK-based GP registration and must provide a clinical history before a licensed prescriber assesses your eligibility based on your BMI and weight-related health conditions.
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 to Mounjaro
NHS route: Mounjaro is available through tier 3 specialist weight management services, but access is limited and varies significantly by region. Waiting lists can extend months to years in many areas. When prescribed through the NHS, there is no cost to you, but you must be referred by your GP and meet local ICB (Integrated Care Board) eligibility criteria. Private route: Faster access without NHS referral, but you pay out-of-pocket. Online consultation takes 15–30 minutes, and if approved, your prescription is sent to a GPhC-registered pharmacy. The online prescriber will discuss diet expectations alongside Mounjaro — weight loss success depends on combining medication with a reduced-calorie diet (typically 500 kcal daily deficit) and increased physical activity. Consider using our GLP-1 weight loss calculator to project potential outcomes at different doses.
- 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 privately in the UK per month?
Private Mounjaro typically costs £150–£320 monthly depending on your prescribed dose (2.5 mg to 15 mg weekly). Starting doses are cheaper; costs increase as you titrate to higher maintenance doses. Prices vary slightly between providers. Always confirm the full cost including delivery before starting treatment.
Can I get Mounjaro free on the NHS in the UK?
Yes, Mounjaro is available through NHS tier 3 specialist weight management services at no cost to patients. However, access is limited and varies by region, with significant waiting lists in many areas. Your GP can refer you to your local specialist service if you meet the BMI and health criteria.
What should my diet look like while taking Mounjaro?
Mounjaro works best alongside a reduced-calorie diet (typically 500 kcal daily deficit) and increased physical activity. Most people naturally eat less due to reduced appetite, but focus on nutrient-dense foods — lean protein, vegetables, whole grains. Avoid high-calorie foods as portion control becomes easier with Mounjaro. A healthcare provider can give personalised dietary advice.
How long does an online Mounjaro assessment take?
An online clinical assessment typically takes 15–30 minutes. You'll discuss your medical history, current medications, weight, height, and health conditions. The prescriber assesses your BMI and eligibility against UK criteria. If approved, your prescription is issued to a pharmacy usually within 24–48 hours.
Is Mounjaro vs Wegovy cheaper on prescription in the UK?
Both Mounjaro and Wegovy are similarly priced through private prescribing (£150–£320 monthly), though exact costs depend on dose and provider. Mounjaro's dual GIP/GLP-1 mechanism may achieve weight loss at lower doses than Wegovy's single GLP-1 action, potentially lowering your long-term costs. Your prescriber can advise which suits 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.