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
Private Weight Loss Clinic — What You Need to Know
A private weight loss clinic in the UK offers prescription weight management services outside the NHS, including access to GLP-1 medications like Wegovy and Mounjaro. These clinics provide faster access to weight loss injections than NHS specialist services, often with online consultations and home delivery of medication. If you're considering private weight management, it's helpful to understand how they work, what medications are available, costs involved, and how they fit into your overall weight loss plan. Our free BMI calculator and weight loss projection tools can help you assess your starting point and explore realistic outcomes.
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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.
How Private Weight Loss Clinics Work in the UK
Private weight loss clinics operate as independent healthcare providers registered with the General Pharmaceutical Council (GPhC). They typically offer online consultations with UK-licensed prescribers who assess your health, BMI, and eligibility for weight management medication. If approved, you receive a prescription and the medication is dispensed by a GPhC-registered pharmacy.
The process is straightforward: complete a health questionnaire, have a video or telephone consultation with a prescriber, and if suitable, your medication (such as Wegovy or Mounjaro) is delivered to your home. Private clinics focus on prescription weight loss medications alongside dietary advice and lifestyle support. Access is not dependent on NHS referral or waiting lists — you can typically start treatment within days rather than months. Most clinics require ongoing prescriber check-ins to monitor progress and adjust doses.
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.
Prescription Medications Available Privately
Private weight loss clinics in the UK can prescribe three main GLP-1 medications licensed for weight management: Wegovy (semaglutide), Mounjaro (tirzepatide), and Saxenda (liraglutide). Wegovy and Mounjaro are the most commonly prescribed — both are once-weekly injections that help reduce appetite and support feeling fuller after smaller meals. Clinical trials showed Wegovy achieves average weight loss of around 15% body weight, while Mounjaro achieves approximately 15–21% depending on dose. These medications are prescription-only and require clinical assessment before prescription. Individual results vary significantly based on lifestyle changes, diet adherence, and your personal response to the medication.
- 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 a private weight loss clinic cost?
Private clinic costs vary between £100–£300 per month depending on medication dose and provider. This typically covers the prescription, prescriber assessment, and medication delivery. Initial consultations range from £20–£80. Costs vary by clinic — some offer package deals or annual subscriptions. NHS treatment, by contrast, is free but involves lengthy waiting lists.
How do private clinics compare to NHS weight loss services?
Private clinics offer faster access (days vs months) without NHS referral, online convenience, and flexible dosing. NHS services are free and provided through specialist tier 3/4 weight management services, which include support from dietitians and psychologists. NHS access depends on local availability and ICB funding. Both require sustained lifestyle changes alongside medication for best results.
Are private weight loss clinic prescriptions safe?
Yes, if provided by a UK-licensed prescriber and GPhC-registered pharmacy. Ensure the clinic employs GMC-registered doctors and dispenses through verified pharmacies. Ask about their prescriber credentials, pharmacist support, and monitoring protocols. Legitimate clinics conduct health checks and monitor your progress regularly.
Do I need to meet specific criteria to use a private weight loss clinic?
Most private clinics follow the same UK eligibility as NHS services: BMI of 30 or above, or 27–29.9 with weight-related health conditions. However, private clinics may have slightly different assessment criteria. Your prescriber will review your health history, current medications, and contraindications before deciding if treatment is appropriate for you.
Can I switch from private to NHS weight loss treatment?
Yes, you can switch at any time. If you're on private medication and want to move to NHS care, contact your GP about referral to a specialist tier 3/4 weight management service. There may be a transition period between providers. Some NHS areas allow continuation of private medications if you're transferred, though this varies by region.
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.