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- How GLP-1 medications work
- Mounjaro vs Wegovy compared
- Injection instructions
- Side effects & solutions
- What to eat on treatment
- FAQs answered
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Wegovy Dose Equivalent To Mounjaro — UK Cost & Access
If you're considering weight loss medication in the UK, you may wonder how Wegovy and Mounjaro compare — particularly their doses and costs. Both are GLP-1 medications licensed for weight management, but they work differently and have different dosing schedules. Understanding the approximate dose equivalence between Wegovy and Mounjaro, along with UK pricing and access routes, can help you make an informed decision with your prescriber. This guide covers the cost and access pathway for both medications in the UK.
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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.
Wegovy and Mounjaro Pricing in the UK
Wegovy costs in the UK range from approximately £129 to £320 per month depending on your dose and which private provider dispenses it. Semaglutide, the active ingredient in Wegovy, comes in five doses: 0.25 mg, 0.5 mg, 1 mg, 1.7 mg, and 2.4 mg (the maximum). Most patients reach maintenance at 2.4 mg after a 16-week titration schedule.
Mounjaro (tirzepatide) typically costs between £149 and £340 per month privately, depending on the dose. The Mounjaro KwikPen comes in six doses: 2.5 mg, 5 mg, 7.5 mg, 10 mg, 12.5 mg, and 15 mg. Each pen contains four weekly injections, so costs may vary by provider and dose level.
Both medications are available through private prescription after an online clinical assessment — no NHS referral is required. However, neither medication is routinely available on the NHS for primary weight management in most regions, though specialist tier 3 weight management services may prescribe them in specific cases.
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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.
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NHS vs Private Access in the UK
NHS route: Access to both Wegovy and Mounjaro via the NHS is limited and regional. Your GP can refer you to a specialist tier 3 or tier 4 weight management service, but waiting lists can be lengthy (sometimes 6–18 months) and availability varies significantly across different ICBs. When prescribed via the NHS, both medications are free, but demand far exceeds capacity in most areas.
Private route: Online consultations with UK-licensed prescribers take 15–30 minutes and assess your eligibility based on BMI, health conditions, and medication interactions. If approved, your prescription is sent to a GPhC-registered pharmacy and dispensed to your home. This route requires payment but offers immediate access without waiting lists. Use our GLP-1 weight loss calculator to explore projected outcomes at different doses before consultation.
Approximate dose equivalence: While there's no official conversion, clinical guidance suggests Mounjaro 5 mg is roughly equivalent to Wegovy 0.5 mg, Mounjaro 10 mg to Wegovy 1.7 mg, and Mounjaro 15 mg to Wegovy 2.4 mg. However, these are approximate — individual response varies significantly. Switching between medications must always be managed by your prescriber, never independently. Your tirzepatide dose should never be changed without clinical guidance, and the same applies to semaglutide dosing schedules.
- 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 Wegovy cost privately in the UK?
Wegovy costs approximately £129–£320 per month privately, depending on your dose and provider. Starting doses (0.25–0.5 mg) are usually cheaper than maintenance doses (2.4 mg). Prices vary between private pharmacies, so it's worth comparing before committing. NHS availability is very limited outside specialist services.
Can I get Mounjaro on the NHS in the UK?
Mounjaro is available through NHS specialist tier 3 weight management services in some regions, but access is restricted and waiting lists are often very long. Your GP can refer you, but there's no assures of access. Private prescription through online assessment is the quickest route for most people seeking immediate access.
What's the equivalent Mounjaro dose to Wegovy 2.4 mg?
Approximately Mounjaro 15 mg is considered equivalent to Wegovy's maximum dose of 2.4 mg, though this is approximate and individual results vary. However, any medication switch must be managed by your prescriber — you should never switch doses independently between these medications.
How long does an online consultation take for Wegovy or Mounjaro?
A typical online consultation with a UK prescriber takes 15–30 minutes. You'll answer questions about your medical history, current medications, BMI, and weight-related health conditions. If approved, your prescription is issued and sent to a pharmacy for dispensal within 1–2 working days.
Why does Mounjaro cost more than Wegovy in some months?
Costs can vary based on your dose, the number of pens required, and your pharmacy. Mounjaro's dual GIP/GLP-1 mechanism may also influence pricing. Always ask your pharmacy for the total monthly cost at your prescribed dose before starting — prices should be transparent and consistent.
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.