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 10 mg Mounjaro Cost in the UK?
The cost of 10 mg Mounjaro in the UK depends on whether you access it through the NHS or privately. On the NHS, tirzepatide is available through specialist tier 3 weight management services at no cost to you (beyond normal NHS charges), though regional availability varies significantly. Privately, a single 10 mg KwikPen (4-week supply) typically costs between £170 and £260, depending on the provider. Individual costs, eligibility, and access routes differ considerably, so understanding your options is essential before starting treatment.
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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 to 10 mg Mounjaro — Eligibility and Costs
On the NHS, Mounjaro (tirzepatide) is available at no direct cost if prescribed through a specialist tier 3 or tier 4 weight management service. However, access is highly variable across UK regions, and many services have lengthy waiting lists. To be eligible for NHS consideration, you typically need a BMI of 30 or above, or 27–29.9 with weight-related health conditions such as type 2 diabetes, hypertension, or cardiovascular disease. South Asian, Chinese, Black African, and Black Caribbean adults may have lower BMI thresholds. You must first be referred by your GP to your local integrated care board (ICB) weight management service. NICE has approved tirzepatide for use within NHS specialist services, but prescription depends on local commissioning and availability. Waiting times can extend to several months or longer in some areas.
- NHS cost: free (within specialist services)
- Eligibility: BMI ≥30, or ≥27 with comorbidities
- Access: GP referral to tier 3 specialist service
- NICE-approved: yes, for licensed indications
- Regional variation: significant — check with your ICB
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 Costs and Access in the UK
Privately, 10 mg Mounjaro costs approximately £170–£260 per KwikPen (4-week supply) depending on the provider and any loyalty discounts. Private prescriptions are issued by UK-licensed prescribers following an online clinical assessment. You do not need an NHS referral or tier 3 appointment to access private Mounjaro — making it faster for eligible adults. Costs vary because different providers negotiate different wholesale prices and offer different service packages. Some private services also offer subscription models or discounts for purchasing multiple pens upfront. Always check the total cost before committing, including any consultation fees. Your GP's weight loss calculator can help you estimate potential outcomes before deciding whether private treatment is right for you.
- Private cost: £170–£260 per 10 mg pen
- Supply duration: 4 weeks (one injection per week)
- No NHS referral needed
- Requires online clinical assessment
- Faster access than NHS routes in most regions
- 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 free on the NHS?
Yes, Mounjaro (tirzepatide) is available free through NHS specialist tier 3 weight management services if you meet eligibility criteria (BMI ≥30, or ≥27 with weight-related health conditions). However, access varies significantly by region, waiting lists can be very long, and not all ICBs currently commission the service. Your GP can refer you to your local weight management service.
How much does a 10 mg Mounjaro pen cost privately in the UK?
A single 10 mg KwikPen (4-week supply) typically costs £170–£260 from private UK providers. Costs vary between providers, and some offer subscription or bulk-purchase discounts. Always check the full price including any consultation fees before ordering.
What's the difference between NHS and private Mounjaro access?
NHS access is free but requires a GP referral and assessment by a specialist tier 3 service, with potential waiting lists. Private access is faster (usually within days) and doesn't require an NHS referral, but you pay for each pen. Both require a clinical assessment to confirm suitability.
How does 10 mg Mounjaro cost compare to Wegovy?
At equivalent doses, Mounjaro and Wegovy typically cost similarly on the private market (both £170–£260 per 4-week supply). NHS availability and eligibility may differ. A prescriber can advise which is more suitable for your individual circumstances.
Are there cheaper ways to get Mounjaro in the UK?
NHS access is the most cost-effective option (free), but availability is limited and varies by region. Some private providers offer subscription discounts or bulk-buy pricing. Always obtain a prescription from a UK-licensed prescriber — buying without a prescription is unsafe and illegal.
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.