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 Is Monjaro in the UK?
Monjaro (tirzepatide) is a prescription-only weight loss injection, but the cost varies significantly depending on whether you access it through the NHS or privately. If you're considering this GLP-1 receptor agonist treatment, it's important to understand both the medication cost and how the dosing structure works. This guide explains UK pricing, what you'll pay, and how to access Monjaro through different routes.
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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.
Monjaro Costs in the UK
Private costs: Monjaro typically costs between £129 and £320 per month through private UK online prescribing services, depending on your dose. Each KwikPen device contains four weekly injections, so you'll need one pen per month for ongoing treatment.
Dose structure: Monjaro starts at 2.5 mg and increases gradually — you stay on each dose for a minimum of 4 weeks before escalating. The maximum dose is 15 mg once weekly. Higher doses cost more because they contain more tirzepatide.
NHS access: On the NHS, Monjaro may be available free through specialist tier 3 weight management services, but access is extremely limited and varies by region. Many NHS areas have long waiting lists or do not currently offer tirzepatide. You'll need a GP referral to specialist services first.
- Private: £129–£320/month depending on dose
- NHS: Free if approved through specialist services (availability varies)
- Each dose escalation may increase cost on private plans
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 the Cost of Monjaro?
Several factors influence how much you'll pay for Monjaro. Your starting dose (2.5 mg) is the entry point, but once you escalate to 5 mg, 10 mg, or higher doses, the monthly cost increases. The provider you choose also matters — different private online prescribing services charge different rates for the same dose. Some offer discounts for longer-term commitments or subscription plans.
Storage costs are minimal (refrigerator space), but you'll need to factor in the prescription consultation fee (typically £15–£50 per assessment). Calculate your projected weight loss using our free GLP-1 weight loss calculator to understand potential outcomes and whether the investment aligns with your goals.
- 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 Monjaro cost per injection?
Monjaro is supplied in KwikPen devices containing 4 weekly injections. The cost per injection varies by dose and provider, but ranges from approximately £32–£80 per week when divided across a month's supply. This breaks down to £129–£320 monthly depending on your dose.
Is Monjaro cheaper than Wegovy?
Both Mounjaro (tirzepatide) and Wegovy (semaglutide) are similar in price through private UK providers, typically £129–£320 per month. However, Monjaro doses escalate differently than Wegovy, so direct cost comparison depends on your specific dose. Your prescriber can advise on cost-effectiveness for your situation.
Can I get Monjaro free on the NHS?
Monjaro may be available free through NHS specialist tier 3 weight management services if you meet eligibility criteria and are approved. However, access varies significantly by region and waiting lists can be very long. You'll need a GP referral to specialist services to explore NHS options.
What's included in the Monjaro price?
The private price typically includes the medication itself and the consultation with a UK-licensed prescriber. Storage is your responsibility (refrigerator at 2–8°C). Additional costs may include initial health screening or follow-up consultations, depending on the provider's service model.
How do I work out if Monjaro is affordable for me?
Consider your budget over at least 3–6 months (one full treatment cycle). Factor in monthly cost, potential escalations as your dose increases, and any consultation fees. Use our BMI calculator to check your eligibility, then speak with a prescriber about realistic costs and potential weight loss outcomes for your situation.
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.