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 Is The Monthly Cost Of Mounjaro In The UK?
The cost of Mounjaro in the UK varies significantly depending on whether you access it through the NHS or privately. On the NHS, Mounjaro is provided at no cost to eligible patients through specialist tier 3 weight management services. Privately, monthly costs typically range from £150 to £320 per month depending on your dose and the prescribing provider. Understanding your options and eligibility can help you access this prescription-only weight management injection affordably. Use our free GLP-1 weight loss calculator to explore potential outcomes and estimated costs 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 To Mounjaro — Eligibility And Pricing
On the NHS, Mounjaro (tirzepatide) is provided free to eligible adults through specialist weight management services (tier 3). NICE has approved tirzepatide for use within NHS specialist services following clinical assessment. To qualify, you must have a BMI of 30 or above, or a BMI of 27–29.9 with weight-related health conditions such as type 2 diabetes, high blood pressure, or sleep apnoea. For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, lower BMI thresholds may apply. NHS access typically requires a referral from your GP to a local specialist weight management service. However, waiting lists vary significantly across UK regions (ICBs) — some areas have waiting times of several months or longer. Once approved, all costs are covered by the NHS.
- NHS Mounjaro is free to eligible patients via specialist services
- Eligibility: BMI 30+ or 27–29.9 with comorbidities
- Lower thresholds apply for certain ethnic backgrounds
- Requires GP referral to tier 3 services
- Regional availability and waiting lists vary
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 Routes In The UK
Private Mounjaro costs range from approximately £150 to £320 per month, depending on your starting dose and the prescribing provider. A single Mounjaro KwikPen contains four weekly doses, so monthly costs reflect the full month's supply at your current dose level. Higher doses (10–15 mg) typically cost more than starting doses (2.5–5 mg). Private access requires an online consultation with a UK-licensed prescriber, followed by a prescription dispensed by a GPhC-registered pharmacy. You do not need an NHS referral for private access — treatment can begin within days if you are clinically suitable. Check multiple providers, as pricing and clinical assessment fees may vary. Calculate your potential weight loss journey using our free weight loss calculator, which can help you compare NHS timelines against private options.
- 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.
Does the NHS provide Mounjaro for free?
Yes. Mounjaro is free on the NHS for eligible adults through specialist tier 3 weight management services. Eligibility requires a BMI of 30 or above, or 27–29.9 with weight-related conditions. Access is via GP referral, though waiting times vary significantly by region.
What is the average monthly cost of Mounjaro privately in the UK?
Private Mounjaro typically costs £150–£320 per month depending on dose. Starting doses (2.5–5 mg) are usually cheaper; higher maintenance doses (10–15 mg) cost more. Each KwikPen contains four weekly injections.
How long does it take to get Mounjaro on the NHS?
NHS access requires a GP referral to a specialist weight management service. Waiting times vary widely by region — some areas have waits of weeks, others several months. Private prescribing is typically faster, taking days once approved.
Is Mounjaro more expensive than Wegovy in the UK?
Private costs are comparable — both range from £150–£320 monthly. Exact pricing depends on dose and provider. On the NHS, both are free if you meet eligibility criteria and can access specialist services.
What affects the monthly cost of a Mounjaro prescription?
Cost varies by dose level (starting 2.5 mg through maximum 15 mg), prescribing provider, and whether accessed privately or via NHS. Each dose increase may increase monthly cost. Use our BMI calculator to check your eligibility and estimated dose pathway.
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.