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
How Much Does Mounjaro Cost for Weight Loss in the UK?
Mounjaro (tirzepatide) costs vary significantly depending on whether you access it through the NHS or privately in the UK. NHS access is free but typically limited to specialist weight management services with long waiting lists, while private prescriptions cost between £150–£300 per month depending on your dose. Before considering cost, you'll need to meet eligibility criteria: a BMI of 30 or above, or BMI of 27–29.9 with a weight-related health condition. Individual costs depend on your starting dose and how quickly you escalate. Use our BMI calculator to check your eligibility first, then speak with your GP or a licensed prescriber about available options.
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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 Pricing — NHS vs Private Access in the UK
NHS access: Mounjaro is free through the NHS but only available via tier 3 specialist weight management services. You cannot get it from your standard GP practice — you need a referral to your local specialist service. Availability and waiting times vary dramatically by region (integrated care board). Some areas have waiting lists of 6–12 months or longer. When you do access it through the NHS, there are no additional costs beyond your normal prescriptions.
Private access: Mounjaro is available through GPhC-registered online prescribing services following an online clinical assessment. Private costs typically range from £150–£300 per month depending on your dose and the provider. This usually breaks down as: consultation fee (£30–£50) plus medication cost (£120–£250 depending on dose). You may save money by paying for multiple months upfront with some providers. Private access does not require an NHS referral and is usually faster than NHS access.
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.
What Affects Your Individual Mounjaro Cost?
Your actual monthly cost depends on several factors. Dose escalation: You start at 2.5 mg (lowest cost) and typically increase every 4 weeks up to a maximum of 15 mg — higher doses cost more. Private provider: Prices vary between online pharmacies; shopping around can save £30–£50 per month. Prescription format: Some providers charge per pen (4-week supply) rather than per dose, affecting total cost. Treatment duration: You may need Mounjaro long-term for sustained weight loss, so monthly cost compounds. Use our GLP-1 weight loss calculator to estimate potential outcomes at different doses — this helps you understand whether the cost aligns with realistic expectations. Always confirm the exact cost structure with your chosen provider before starting 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.
Is Mounjaro free on the NHS for weight loss?
Mounjaro is free on the NHS but only through specialist tier 3 weight management services, not from your GP. Access requires referral and varies by region. Waiting lists can be very long (6–12+ months in many areas). Private access costs £150–£300 monthly and is typically faster.
How much does each Mounjaro dose cost privately in the UK?
Private Mounjaro costs vary by dose and provider. Starting dose (2.5 mg) typically costs £120–£150 per month. Maximum dose (15 mg) costs £250–£300 per month. Consultation fees add £30–£50. Always confirm pricing with your chosen provider before treatment.
Will my weight loss cost depend on how long I take Mounjaro?
Yes. Mounjaro is often used long-term for sustained weight loss — it's not a short-term course. Monthly costs accumulate, so cost per year is typically £1,800–£3,600 privately. NHS access has no additional medication cost but involves waiting times.
What happens to the cost if I need to increase my Mounjaro dose?
Each dose increase raises the monthly cost. You start at 2.5 mg and escalate every 4 weeks. Higher doses cost more — the increase is typically £20–£40 per month per dose increase. Your prescriber will manage escalation based on your response and tolerance.
How do I know if I'm eligible for Mounjaro before paying for it?
You need a BMI of 30+ or BMI 27–29.9 with a weight-related health condition (diabetes, high blood pressure, cardiovascular disease, sleep apnoea). Use our free BMI calculator to check your BMI first, then discuss eligibility with your GP or a licensed prescriber before starting.
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.