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 Weight Loss Tracker: Free Tools & UK Access
If you're considering Mounjaro (tirzepatide) for weight management in the UK, understanding how to access it and what it costs is essential. MyWeightCheck provides free tools including a GLP-1 weight loss calculator and progress tracker to help you monitor potential results and track your weight loss journey. This guide explains how to get a Mounjaro prescription in the UK through both NHS and private routes, typical costs, and what the online assessment process involves. Whether you're exploring NHS specialist services or private prescription options, we'll help you understand your choices and expectations.
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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.
Mounjaro Costs in the UK: Private Prescription Context
Private prescription costs for Mounjaro in the UK typically range from £129 to £320 per month, depending on your dose and the provider. Starting doses (2.5 mg) are generally at the lower end, while maintenance doses (10–15 mg) cost more.
- 2.5 mg dose — around £129–£180/month
- 5–7.5 mg dose — around £160–£220/month
- 10–15 mg dose — around £220–£320/month
Each KwikPen contains four weekly injections (one month supply). Costs vary between GPhC-registered online pharmacy providers, so comparing options is worthwhile. Private prescriptions bypass NHS waiting lists — assessment and prescription can be completed within days or weeks. However, private costs are not covered by the NHS and are your personal responsibility. Using our free GLP-1 weight loss calculator can help you estimate potential results at different doses to inform your decision.
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: How to Get Mounjaro in the UK
NHS route: Available through specialist tier 3/4 weight management services by referral from your GP. NICE has approved tirzepatide for NHS use, but access varies significantly by region. Waiting lists can be several months to over a year in many areas. Once prescribed, NHS-funded Mounjaro is free — you only pay standard prescription charges (£9.90 per item in England, or free if eligible).
Private route: Complete an online consultation with a UK-licensed prescriber through a GPhC-registered pharmacy provider. No GP referral needed. Prescriber assesses your BMI, health history, and suitability. If approved, a prescription is issued and your first dose ships within days. Track your progress with our free weight loss progress tracker throughout your treatment.
- 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 the online Mounjaro assessment involve?
A GPhC-registered online prescriber will ask about your weight, height, BMI, medical history, current medications, and any contraindications. They'll check whether you meet eligibility criteria (typically BMI 30+ or 27+ with weight-related health conditions). The assessment takes 10–15 minutes. If approved, a prescription is issued; if not suitable, the provider will advise alternatives or recommend GP consultation.
How long does it take to get Mounjaro on the NHS?
NHS access depends on your local Integrated Care Board and specialist weight management service availability. Referral from your GP triggers an assessment, but waiting lists vary from 3–6 months in well-resourced areas to 12+ months in others. Some regions have limited availability. Contact your local weight management service for current waiting times.
Can I use my progress tracker with Mounjaro treatment?
Yes — our free progress tracker is ideal for logging weekly weight measurements, noting side effects, and tracking your journey on Mounjaro. Consistent tracking helps you and your prescriber monitor response to treatment and adjust doses if needed. Many users find visual progress tracking motivating alongside the GLP-1 weight loss calculator projections.
Is Mounjaro cheaper on the NHS or private?
NHS Mounjaro is cheaper — you pay only the standard prescription charge (£9.90 per item in England, or free if exempt). Private costs range from £129–£320/month depending on dose. If you qualify for NHS treatment and can access specialist services, the NHS route is significantly more affordable — but waiting times may be longer.
What's the difference between Mounjaro and Wegovy for UK access?
Both are prescription-only GLP-1-based weight loss injections licensed in the UK. Mounjaro is a dual GIP/GLP-1 agonist; Wegovy is GLP-1 only. Both available privately through online prescriptions. NHS availability varies by region for both. Mounjaro typically costs slightly more privately due to higher maximum doses. Your prescriber will assess which is more suitable for your individual health needs.
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.