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
Can I Get Mounjaro Online in the UK?
Yes, you can access Mounjaro online in the UK through both NHS specialist services and private prescription routes. Mounjaro (tirzepatide) is a prescription-only weight management injection available to UK adults who meet eligibility criteria. The route you take — NHS or private — affects cost, waiting times, and how quickly you can start treatment. Our GLP-1 weight loss calculator can help you understand potential outcomes at different doses if you're considering this medication.
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 Online Access and Costs in the UK
Private prescription route: Mounjaro is available through GPhC-registered online pharmacies following an online clinical assessment with a UK-licensed prescriber. You do not need an NHS referral or GP approval. The prescriber reviews your health information, BMI, and weight-related conditions to assess suitability. If approved, a prescription is issued and dispensed by post.
Cost ranges: Private Mounjaro costs approximately £129–£320 per month depending on dose (starting at 2.5 mg, increasing to maximum 15 mg). This includes the clinical assessment and prescription. Use our GLP-1 weight loss calculator to explore different doses, as higher doses typically cost more but may provide greater weight loss support.
- No waiting list — treatment can start within days
- Flexible scheduling — adjust doses with your prescriber
- Private costs are not covered by NHS
- Requires valid UK address and valid ID
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 — Timeline and Eligibility
NHS route: Mounjaro is approved by NICE for NHS use within specialist tier 3 weight management services. Access is through a GP referral to your local specialist weight management team. NHS eligibility criteria are the same as private (BMI ≥30 or BMI 27–29.9 with weight-related conditions), but availability varies significantly by region. Waiting lists for NHS specialist services can range from several months to over a year in many areas. Once approved, treatment is free on the NHS.
Private route advantages: No waiting list, faster access, flexible appointment scheduling. NHS advantages: Free treatment, ongoing specialist support, regular monitoring. Your choice depends on urgency, budget, and regional NHS capacity.
- 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.
Is Mounjaro available on prescription online in the UK?
Yes, Mounjaro is available through private online prescribing. You complete an online consultation with a UK-licensed prescriber, who assesses your eligibility. If approved, your prescription is issued and the medication is posted to your UK address. No pharmacy name is recommended — search for "Mounjaro online UK prescription" to find GPhC-registered services.
How much does Mounjaro cost privately in the UK?
Private Mounjaro costs range from approximately £129–£320 per month depending on your dose. The starting dose (2.5 mg) is cheaper; higher maintenance doses (10–15 mg) cost more. This includes your clinical assessment and prescription. Costs vary slightly between providers, so compare options.
What makes me eligible for Mounjaro online?
You must have a BMI of 30 or above, or BMI of 27–29.9 with at least one weight-related health condition (type 2 diabetes, high blood pressure, high cholesterol, sleep apnoea, or heart disease history). Ethnicity-specific thresholds apply for South Asian, Chinese, Black African, and Black Caribbean adults (lower BMI eligibility). A prescriber assesses your individual suitability during your online consultation.
How fast can I get Mounjaro if I apply online privately?
Private online Mounjaro typically arrives within 3–7 working days after your prescription is approved. Your consultation appointment can often be scheduled within 24–48 hours. This is much faster than NHS access, where waiting lists often exceed 6–12 months depending on your region and local specialist service capacity.
Can I get Mounjaro through the NHS without waiting?
NHS Mounjaro access is free but involves waiting for a referral to your local tier 3 specialist weight management service. Waiting times vary by region (ICB) but commonly exceed 6–12 months. If you need treatment urgently, private online prescribing offers faster access. Ask your GP about NHS waiting times in your area or explore private options.
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.