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
Are Mounjaro Prices Going Up in the UK?
Mounjaro (tirzepatide) pricing in the UK varies significantly depending on whether you access it through the NHS or privately. While prescription costs on the NHS are capped at the standard prescription fee (currently £9.90 in England), private Mounjaro costs range from around £150–£320 per month depending on dose and provider. Understanding both routes and what affects pricing is important for anyone considering this weight management option. Use our free GLP-1 weight loss calculator to explore potential outcomes with tirzepatide at different doses.
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 vs Private Mounjaro: Cost and Eligibility
NHS Route: Mounjaro is available through specialist tier 3 weight management services in the UK, following NICE approval for tirzepatide. On the NHS, you pay a single prescription charge (£9.90 in England) regardless of dose — making it significantly cheaper if you can access it. However, NHS availability is inconsistent across regions, and waiting lists can be lengthy. Eligibility requires a BMI of 30 or above, or 27–29.9 with weight-related health conditions such as type 2 diabetes, hypertension, or sleep apnoea.
Private Route: Private prescriptions cost £150–£320 per month, varying by dose level (2.5 mg through 15 mg) and provider pricing. Private access does not require NHS referral or specialist assessment — you can obtain a prescription through a GPhC-registered online prescriber following a clinical assessment. Some private providers offer bundled packages or subscription models that may reduce monthly costs.
- NHS: Single £9.90 prescription charge per pen (4-week supply)
- Private: £150–£320/month depending on dose and provider
- Mounjaro KwikPen contains 4 doses (4 weeks of treatment)
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.
Why Mounjaro Costs Matter: Understanding Pricing Factors
Mounjaro pricing reflects both the cost of tirzepatide manufacture and current UK market positioning. Private costs reflect the prescriber's fee, clinical assessment, pharmacy dispensing, and delivery. NHS prescription charges remain fixed regardless of medication cost, making NHS access dramatically cheaper — but also more dependent on regional availability and ICB (Integrated Care Board) formulary decisions.
Price increases can occur due to manufacturing costs, supply chain factors, or changes in provider pricing models. It's worth checking eligibility for NHS access first, as this removes the cost barrier entirely. Use our free BMI calculator to confirm your eligibility status, and speak to your GP about NHS specialist weight management service referrals. Private online prescribers can provide cost estimates before you commit to 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.
How much does Mounjaro cost on the NHS?
On the NHS, Mounjaro costs a single prescription charge of £9.90 in England (or your applicable regional charge). This covers a 4-week supply regardless of dose. Access is through specialist tier 3 weight management services, though waiting times and availability vary significantly by region.
Why is private Mounjaro more expensive than NHS?
Private Mounjaro costs reflect prescriber consultation fees, clinical assessment, pharmacy dispensing, storage, and delivery. NHS prescriptions are subsidised and capped at the standard charge, making NHS access far cheaper. However, private access is faster and does not require NHS referral.
Does Mounjaro pricing vary by dose?
On the NHS, no — all doses cost the same £9.90 prescription charge. Privately, costs typically increase with dose strength (from 2.5 mg to 15 mg), ranging £150–£320 per month. Confirm exact pricing with your chosen provider before starting treatment.
Is Mounjaro cheaper than Wegovy in the UK?
Pricing is similar both on NHS (single prescription charge) and privately (£150–£320/month range for both). Cost difference is minimal; eligibility and availability are more important factors. Mounjaro vs Wegovy choice should be based on clinical suitability, not price.
Can I get Mounjaro without paying if I'm eligible on the NHS?
Yes — NHS patients only pay a single prescription charge (£9.90 in England) per 4-week supply, regardless of the medication's actual cost. This is dramatically cheaper than private access. Ask your GP for referral to your local tier 3 weight management service to explore NHS eligibility.
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.