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 Tracker: UK Cost and Access Guide
Tracking your Mounjaro journey in the UK starts with understanding how to access tirzepatide and what it costs. Whether you're exploring NHS specialist services or private prescription options, costs and availability vary significantly. This guide explains both routes, helps you understand eligibility criteria, and shows what to expect during the online clinical assessment process that precedes any prescription. We've included our free GLP-1 weight loss calculator to help you estimate potential outcomes alongside costs.
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 and Access in the UK
Private prescription costs for Mounjaro in the UK typically range from £130 to £320 per month depending on your dose and the provider. Starting doses (2.5 mg) are generally less expensive, while maintenance and higher doses (15 mg) cost more. Each KwikPen contains four weeks of doses, so monthly costs usually mean one pen per prescription. Important: Private prescriptions require an online clinical assessment with a UK-licensed prescriber before being dispensed by a GPhC-registered pharmacy — no prescription means no medication. Costs do not include the consultation fee (typically £20–£50), which some providers bundle into the final price. Prices vary between providers, so comparing costs across GPhC-registered online services is worthwhile. Payment is usually per dose level, not per individual injection.
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: What's the Difference?
NHS access involves referral to your local tier 3 specialist weight management service through your GP — this is free at point of use but has significant waiting lists in many regions, sometimes 6–18 months. Private access is faster: you complete an online consultation with a licensed prescriber, receive a prescription if suitable, and begin treatment within days. The NHS route requires ongoing specialist supervision; private routes typically involve regular check-ins with your prescriber. Most people access Mounjaro privately in the UK due to NHS waiting times. When comparing costs, factor in consultation fees, postage, and any follow-up appointments. Our GLP-1 weight loss calculator can help you project potential outcomes so you can evaluate whether costs align with your goals.
- 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 costs range from approximately £130–£320 per month depending on dose. Starting doses (2.5 mg) are usually cheaper; maximum doses (15 mg) are more expensive. Each KwikPen lasts four weeks. Prices vary between GPhC-registered pharmacies, so it's worth comparing. Consultation fees (£20–£50) are additional.
Can I get Mounjaro on the NHS in the UK?
Yes, Mounjaro is approved for use within NHS specialist tier 3 weight management services. However, access requires referral from your GP and availability varies by region. Waiting lists can be very long (6–18 months in many areas), which is why many people access it privately instead.
What happens during an online Mounjaro consultation?
A UK-licensed prescriber will review your medical history, current medications, and BMI using a questionnaire. They'll assess whether Mounjaro is suitable for you based on eligibility criteria (BMI 30+ or 27+ with health conditions). If approved, you'll receive a prescription; if not, they'll explain why and suggest alternatives.
Do I need to pay for each Mounjaro injection separately?
No. You pay for the full KwikPen (four weeks of injections). Costs are usually quoted per dose level (2.5 mg, 5 mg, etc.), not per individual injection. When you increase doses, you'll typically need a new prescription and pay the new dose price.
How do I know if I'm eligible for Mounjaro in the UK?
Generally, you're eligible if you have a BMI of 30 or above, or 27–29.9 with at least one weight-related health condition (diabetes, high blood pressure, sleep apnoea, cardiovascular disease). South Asian, Chinese, Black African, and Black Caribbean adults may have lower eligibility thresholds. Your prescriber will confirm eligibility during consultation.
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.