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 in the UK?
Mounjaro (tirzepatide) is available in the UK through both NHS specialist services and private prescribing, but costs vary significantly depending on which route you choose. If you're eligible and prescribed through the NHS, there is no direct cost for the medication itself—you'll only pay the standard prescription fee. Through private online prescribing services, costs typically range from £150 to £300 per month depending on your dose. Understanding both options helps you make an informed decision about accessing this weight management injection in the UK.
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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.
NHS Access and Costs for Mounjaro
Through the NHS: If you're prescribed Mounjaro by a specialist weight management service (tier 3), you pay only the standard NHS prescription charge—currently £9.90 per prescription in England (April 2024). Each KwikPen contains 4 weeks of doses, so one prescription covers your monthly supply. In Scotland, Wales, and Northern Ireland, prescription charges may differ or be free depending on your location.
NHS eligibility criteria: You typically need a BMI of 30 or above, or 27–29.9 with weight-related health conditions like type 2 diabetes, hypertension, or cardiovascular disease. For South Asian, Black African, Black Caribbean, or Chinese heritage adults, lower thresholds may apply. Access is through GP referral to tier 3 specialist services, and waiting times vary significantly by region—some areas have waiting lists of several months or longer.
- Standard NHS prescription fee: £9.90 (England)
- One KwikPen covers 4 weeks of once-weekly injections
- Requires referral to specialist weight management service
- Regional availability and waiting times vary considerably
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
Private costs: Through private UK-licensed online prescribing services, Mounjaro typically costs between £150 and £300 per month, depending on your current dose. Starting doses (2.5 mg) are usually at the lower end of this range, while higher maintenance doses (10 mg, 15 mg) cost more. Private prescriptions don't require NHS referral—you complete an online clinical assessment, and if approved, a UK-licensed prescriber issues a prescription to a GPhC-registered pharmacy for dispatch. This route offers faster access but at significantly higher cost.
- Private costs: approximately £150–£300 per month
- Price varies by dose—higher doses cost more
- No NHS waiting list required
- Requires clinical assessment from a licensed prescriber
- 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 the NHS for weight loss?
Yes. Mounjaro is approved by NICE and available through NHS tier 3 specialist weight management services for eligible adults. Prescription costs only £9.90 in England. However, access varies by region and waiting times can be several months.
What's the difference between NHS and private Mounjaro costs?
On the NHS you pay £9.90 per prescription (England). Privately, costs range £150–£300 monthly depending on dose. Private offers faster access but at much higher cost. Choice depends on your budget and willingness to wait.
Does the dose affect the price of Mounjaro?
Yes. Private Mounjaro costs increase with higher doses—starting doses cost less than maintenance doses (15 mg). NHS prescription cost remains £9.90 regardless of dose. This is an important consideration when budgeting for treatment.
How do I access Mounjaro on the NHS?
Ask your GP for a referral to your local tier 3 specialist weight management service. You'll be assessed for eligibility (BMI and health conditions). If approved, Mounjaro is prescribed and dispensed through the NHS at the standard prescription charge.
Can I use our GLP-1 weight loss calculator to estimate costs?
Our free GLP-1 weight loss calculator helps project potential weight loss at different tirzepatide doses, which can inform your cost-benefit decision. Use it alongside this pricing information to understand the full picture of treatment.
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.