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
Can I Get Mounjaro Privately in the UK?
Yes, you can access Mounjaro privately in the UK without an NHS referral. Private prescription routes are available through GPhC-registered online pharmacies following an online clinical assessment with a UK-licensed prescriber. This offers an alternative to NHS specialist weight management services, which often have significant waiting lists. Understanding your options — NHS versus private — helps you make an informed choice about which route suits your circumstances and timeline.
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.
Private Mounjaro Access and Cost in the UK
Private prescription Mounjaro is available in the UK through regulated online healthcare providers. Costs typically range from £129 to £320 per month depending on the dose you're prescribed. Starting doses (2.5 mg) are usually at the lower end; higher maintenance doses (10–15 mg) cost more. Each KwikPen contains 4 weeks of weekly injections. You do not need an NHS referral or GP involvement — you can access private prescribing directly. The process involves an online consultation with a UK-licensed prescriber who will assess your eligibility based on your BMI, weight-related health conditions, medical history, and current medications. If approved, your prescription is dispensed by a GPhC-registered pharmacy. Check your BMI using our free BMI calculator above to understand where you stand relative to eligibility thresholds (BMI 30+, or 27+ with weight-related conditions). Private costs are not covered by the NHS and are your responsibility.
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.
NHS vs Private Access to Mounjaro
NHS route: Mounjaro may be available through your GP via referral to a specialist tier 3 weight management service. NICE has approved tirzepatide for NHS use, but availability varies significantly by region and waiting times can be months to years. You pay nothing if approved, but access depends on your local integrated care board (ICB). Private route: No waiting list, faster access, but you pay the full cost. Both routes require clinical assessment and eligibility criteria (typically BMI 30+, or 27+ with conditions like type 2 diabetes, hypertension, or cardiovascular disease). Your GP can advise on NHS options; a private prescriber assesses you independently. For timeline-conscious patients, private access offers immediate access after approval.
- 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 private Mounjaro cost per month in the UK?
Private Mounjaro costs typically range from £129 to £320 per month depending on dose. Starting dose (2.5 mg) is usually £129–£180; higher doses (10–15 mg) cost £250–£320. Prices vary slightly between providers. Each KwikPen covers 4 weeks of once-weekly injections. Costs are not covered by the NHS if prescribed privately.
Do I need my GP's permission to get Mounjaro privately?
No, you do not need GP permission or involvement. Private prescriptions are issued by UK-licensed prescribers after an independent online consultation. Your GP doesn't need to refer you or approve the prescription. However, informing your GP is sensible so they have a complete picture of your healthcare and can monitor you appropriately.
What happens during a private Mounjaro consultation?
You complete an online health questionnaire detailing your weight, height, medical history, medications, and current health conditions. A UK-licensed prescriber reviews this and may ask follow-up questions via video or chat. They assess your eligibility (BMI and weight-related conditions), discuss side effects and expectations, and if suitable, issue a prescription. The process typically takes 24–48 hours from application to prescription approval.
How does private Mounjaro cost compare to NHS access?
NHS access is free if approved, but waiting lists are often long (months to years in many regions). Private access costs £129–£320/month but has no waiting list. If speed is critical, private is faster. If cost is the main concern and you can wait, NHS is free. Both require eligibility assessment.
Can I switch from private Mounjaro to NHS if I get referred later?
Potentially, yes. If you're prescribed privately and then referred to an NHS weight management service, your GP and specialist can review your care. However, there's no automatic transfer — NHS specialists will conduct their own assessment. Continuing on private prescription gives you continuity of care while waiting for potential NHS options to become available.
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.