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
What's the Best Price for Mounjaro in the UK?
The cost of Mounjaro (tirzepatide) in the UK varies significantly depending on whether you access it through the NHS or privately. On the NHS, Mounjaro is available free at the point of use through specialist tier 3 weight management services—but access depends on eligibility and regional availability. Privately, prices typically range from £150 to £300+ per month depending on dose and provider. Understanding both routes and what affects pricing will help you make an informed decision about accessing this prescription-only weight management injection.
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.
NHS Access to Mounjaro and Pricing
On the NHS, Mounjaro is free at the point of prescription when accessed through a specialist tier 3 or tier 4 weight management service. However, NHS availability is limited and varies significantly by region. You must be referred by your GP and meet NICE eligibility criteria: a BMI of 30 or above, or 27–29.9 with weight-related health conditions (type 2 diabetes, hypertension, sleep apnoea, or cardiovascular disease). For South Asian, Chinese, Black African, or Black Caribbean adults, lower BMI thresholds may apply. The challenge is access, not cost—waiting lists for NHS specialist services can be months or even years in many areas. Some regions have very limited tier 3 services, making NHS access impractical. If you qualify and can access NHS services quickly, this is the most cost-effective option. Use our free BMI calculator to check where you stand against NHS thresholds.
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.
Private Mounjaro Pricing in the UK
Privately, Mounjaro costs vary based on dose and provider. Expect to pay approximately £150–£200 per month for starter doses (2.5–5 mg) and £250–£320 per month for higher maintenance doses (10–15 mg). Private access involves an online consultation with a UK-licensed prescriber, who will assess your eligibility before issuing a prescription. A GPhC-registered pharmacy then dispenses your Mounjaro KwikPen. Private pricing includes the consultation fee, prescription, and medication. The advantage: no waiting list, quick access within days. The drawback: ongoing monthly costs. Some private providers offer dose escalation packages or loyalty discounts. Compare options carefully, as pricing and service quality vary between providers.
- 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 free on the NHS?
Yes, Mounjaro is free through NHS specialist tier 3 weight management services. However, access is limited and varies by region. You must meet NICE eligibility criteria (BMI ≥30, or ≥27 with comorbidities) and be referred by your GP. Waiting lists can be very long, sometimes over a year.
How much does Mounjaro cost privately in the UK?
Private Mounjaro typically costs £150–£200 per month at starter doses (2.5–5 mg) and £250–£320 per month at higher doses (10–15 mg). This includes the online consultation, prescription, and medication from a GPhC-registered pharmacy.
What affects the price of Mounjaro?
Dose is the main factor—higher doses cost more. Provider also matters; different private services charge different rates. Some offer package deals or discounts. The strength of the pound and import costs can also influence pricing.
Can I use my NHS prescription in a private pharmacy?
Yes, NHS prescriptions can be dispensed by private GPhC-registered pharmacies. However, most people access Mounjaro either entirely through NHS services or entirely privately—mixing routes is less common.
How does Mounjaro pricing compare to Wegovy?
Both are similar in price when accessed privately (roughly £150–£320 per month depending on dose). Both are free on the NHS through specialist services. Mounjaro is a dual GIP/GLP-1 agonist while Wegovy (semaglutide) is GLP-1 only; cost should not be the deciding factor—clinical suitability matters more. Try our GLP-1 weight loss calculator to explore potential outcomes with either medication.
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.