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 Diet Plans & Cost — How to Access in the UK
If you're looking for a Mounjaro diet plan PDF or want to understand how to access tirzepatide in the UK, this guide covers both NHS and private routes. Mounjaro (tirzepatide) is a prescription-only weight management injection available through specialist services and private prescribers in the UK. Understanding eligibility, costs, and the prescription process will help you make an informed decision about whether this treatment is right for you.
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.
UK Private Prescription Costs & Access Routes
Accessing Mounjaro in the UK depends on your route: NHS specialist services or private online prescribing. Through the NHS, Mounjaro is available via tier 3 and 4 specialist weight management services following referral from your GP, though regional availability and waiting times vary significantly. Private prescriptions through GPhC-registered online pharmacies typically cost between £129 and £320 per month depending on your dose. The starting dose (2.5 mg) is usually at the lower end, while higher doses (10–15 mg) cost more. Your prescriber will assess eligibility based on BMI and weight-related health conditions. Use our free GLP-1 weight loss calculator to understand potential outcomes at different doses, and our BMI calculator to check your current BMI category against NHS eligibility thresholds.
- NHS access: free but longer waiting times, regional variation
- Private access: faster, costs from £129–£320/month, no referral needed
- Doses escalate over 4-week intervals from 2.5 mg to 15 mg maximum
- Online consultations require disclosure of medical history and current medications
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 & What to Expect
The NHS route involves referral to a specialist weight management service, clinical assessment, and free prescriptions once approved — but waiting lists in many regions exceed six months. The private route is faster: you complete an online health questionnaire, have a consultation with a UK-licensed prescriber, and receive a prescription within 24–48 hours if approved. Private prescriptions are dispensed by GPhC-registered pharmacies. Both routes require a clinical assessment; your prescriber will check your BMI, weight-related conditions (such as type 2 diabetes, high blood pressure, or cardiovascular disease), and medication interactions. Neither route provides a "diet plan PDF" — weight loss with Mounjaro requires your own dietary approach alongside the medication. Track your progress using our free progress tracker and use the weight converter to monitor results in your preferred units (kg, stone, or pounds).
- 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 does Mounjaro cost on the NHS?
Mounjaro is free on the NHS once prescribed through a specialist weight management service. However, access requires referral from your GP and assessment by a tier 3/4 specialist team. Regional availability and waiting times vary significantly — some areas have very long waiting lists.
How much does private Mounjaro cost in the UK?
Private Mounjaro prescriptions typically cost £129–£320 per month depending on your dose. The 2.5 mg starting dose is usually at the lower end of this range. Costs increase with higher doses (5 mg, 10 mg, 15 mg). Some private providers offer package deals for multiple months.
Do I need a diet plan to use Mounjaro?
Mounjaro works most effectively alongside a reduced-calorie diet and increased physical activity. Clinical trials showed results when combined with lifestyle changes. You don't receive a formal "diet plan PDF" — your approach depends on your preferences and your prescriber's guidance. A dietitian can provide personalised advice.
How quickly can I get a private Mounjaro prescription?
Private online prescriptions are typically processed within 24–48 hours if you're approved. After your consultation, if your prescriber assesses you as eligible, your prescription is sent to a GPhC-registered pharmacy for dispensing. NHS prescriptions require a longer assessment and specialist referral process.
What's the difference between Mounjaro and Wegovy cost in the UK?
Private costs are similar (£129–£320/month for both), though exact prices vary by provider and dose. Mounjaro has a higher maximum dose (15 mg weekly) versus Wegovy (2.4 mg weekly). Clinical trial data suggests Mounjaro may produce slightly higher average weight loss, though individual results vary significantly.
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.