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
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Sleep Hypnosis for Weight Loss — What Works in the UK
Sleep hypnosis for weight loss is sometimes promoted as a complementary approach to weight management, but evidence for its effectiveness is limited. If you're looking to lose weight in the UK, there are evidence-based medical options available. For adults who meet eligibility criteria, prescription weight loss medications like Mounjaro and Wegovy are now available through the NHS and private prescribing. Our GLP-1 weight loss calculator can help you explore potential outcomes with these clinically proven treatments, whilst our BMI calculator shows where you currently stand on NHS weight management guidelines.
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.
Evidence-Based Weight Loss Options in the UK
While sleep hypnosis may be explored as part of a holistic wellness approach, the most effective weight management uk treatments are those supported by clinical evidence. The NHS recommends a combination of dietary changes, increased physical activity, and behavioural support. For eligible adults, prescription weight loss medications offer significant additional support:
- Mounjaro (tirzepatide) — a dual GIP and GLP-1 receptor agonist. Clinical trials showed an average weight loss of 15–21% body weight at 72 weeks, depending on dose
- Wegovy (semaglutide) — a GLP-1 receptor agonist. Average weight loss of approximately 15% body weight in clinical trials
- Saxenda (liraglutide) — a daily GLP-1 injection, licensed for weight management
All three are prescription-only medicines requiring clinical assessment. Individual results vary, and these medications work best alongside lifestyle changes. Use our free GLP-1 weight loss calculator to explore projected outcomes at different doses based on your current weight.
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 and Private Access to Weight Loss Treatment
In the UK, there are two routes to prescription weight loss medication. NHS access is through specialist tier 3 and tier 4 weight management services — you'll need a referral from your GP, and availability varies significantly by region. Waiting lists can be lengthy in some areas. Private access is available through GPhC-registered online pharmacies following a clinical assessment with a UK-licensed prescriber, without needing an NHS referral.
To find out if you're eligible, check your BMI using our free BMI calculator — if it's 30 or above, or 27–29 with weight-related health conditions like type 2 diabetes or high blood pressure, you may qualify. Speak to your GP about nhs weight loss options, or explore private prescribing if you'd prefer faster access.
- 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.
Is sleep hypnosis effective for weight loss?
Sleep hypnosis has limited scientific evidence for weight loss. Some studies suggest it may support relaxation and stress reduction, which indirectly helps with weight management, but it is not considered a primary weight loss treatment. For UK adults, evidence-based options like prescription medications, dietary changes, and exercise are more effective.
What prescription weight loss medications are available in the UK?
Three medications are licensed for weight management in the UK: Mounjaro (tirzepatide), Wegovy (semaglutide), and Saxenda (liraglutide). All are prescription-only and require clinical assessment. Mounjaro and Wegovy are once-weekly injections; Saxenda is a daily injection. Clinical trials showed weight loss of 14–21% body weight depending on the medication and dose.
Who is eligible for prescription weight loss medication in the UK?
Adults with a BMI of 30 or above, or 27–29 with weight-related health conditions (type 2 diabetes, high blood pressure, sleep apnoea, or cardiovascular disease), may be eligible. Lower thresholds apply for adults of South Asian, Chinese, Black African, or Black Caribbean heritage. A GP or licensed prescriber will assess eligibility individually.
What's the difference between NHS and private weight loss medication access?
NHS access is through specialist weight management services (usually requires a GP referral and has regional availability and waiting lists). Private access is through GPhC-registered online pharmacies with a UK-licensed prescriber, available without NHS referral but at a cost. Both routes require clinical assessment.
How much weight can I expect to lose with prescription medications?
Clinical trials show an average weight loss of 14–21% body weight over 12–18 months, depending on the medication and dose. However, individual results vary significantly. Weight loss is typically greater when medication is combined with a reduced-calorie diet and increased physical activity. Use our GLP-1 weight loss calculator for an estimate based on your current weight. ```
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.