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
What You Need to Know About Monjsro in the UK
Monjsro is a topic that relates to weight management and UK health guidance. This informational guide provides evidence-based context aligned with NHS standards to help you understand weight management options available in the UK. Whether you're exploring healthy weight ranges, understanding BMI categories, or learning about prescription weight loss support, this page offers clear, practical information for UK adults. Our free BMI calculator and weight converter tools can help you assess your personal health context alongside this guidance.
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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.
NHS Guidance and UK Weight Management Standards
The NHS recommends a healthy BMI range of 18.5 to 24.9 for most UK adults, though lower thresholds apply for people of South Asian, Chinese, Black African, or Black Caribbean heritage (18.5 to 22.9). Weight management in the UK is typically delivered through a tiered approach: tier 1 covers self-help and digital tools; tier 2 includes primary care interventions; tier 3 offers specialist multidisciplinary weight management services where prescription medications may be considered; and tier 4 covers surgical options for severe obesity.
Prescription weight loss medications available in the UK include GLP-1 receptor agonists and dual GIP/GLP-1 agonists, all requiring a clinical assessment by a UK-licensed prescriber. The NHS emphasises that medication works alongside dietary changes and increased physical activity, not instead of them. Weight loss of 0.5 to 1 kg per week is considered sustainable, and even a 5–10% reduction in body weight can deliver meaningful health benefits including improved blood pressure, better blood sugar control, and reduced joint strain.
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.
Using UK Health Tools and Getting Personalised Advice
Understanding your current health baseline is an important first step. Use our free BMI calculator above to check where your weight falls according to NHS guidelines, and our weight converter to switch between kg, stone, and pounds — UK adults often find it helpful to work with both metric and imperial measurements. If you're interested in understanding potential weight loss outcomes with medication support, our GLP-1 weight loss calculator can help you explore projected results at different dose levels.
For personal advice about weight management options, NHS guidance, or whether prescription support is suitable for you, always consult your GP. They can assess your individual health needs, discuss available options, and refer you to specialist services if appropriate. Your GP is the best starting point for any weight management journey in the UK.
- 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.
What is a healthy weight range for UK adults?
According to NHS guidelines, a healthy BMI is 18.5 to 24.9 for most adults. For people of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends a lower threshold of 18.5 to 22.9. Your exact healthy weight range depends on your height; use our BMI calculator above to find yours. Your GP can also provide personalised guidance based on your individual health.
How does the UK NHS approach weight management?
The NHS uses a four-tier system: tier 1 covers self-help tools and community programmes; tier 2 includes GP-led behaviour change support; tier 3 offers specialist multidisciplinary weight management services where medications may be prescribed; tier 4 covers bariatric surgery for severe obesity. Access and waiting times vary by region. Ask your GP about tier 3 services in your area if you're interested in specialist support.
What prescription weight loss medications are available in the UK?
Several prescription-only weight loss injections are licensed in the UK, including GLP-1 receptor agonists and dual GIP/GLP-1 agonists. All require a clinical assessment by a UK-licensed prescriber and are used alongside lifestyle changes. Individual eligibility depends on BMI and health conditions. Your prescriber will assess whether medication is appropriate for you.
How much weight can I expect to lose with medication support?
Clinical trials show average weight loss of 14–21% of body weight, though individual results vary significantly. Weight loss depends on the specific medication, dose, adherence, dietary changes, and physical activity. Sustainable loss is typically 0.5–1 kg per week. Your prescriber will discuss realistic expectations based on your personal circumstances.
Where can I get more UK health information about weight management?
The NHS website offers evidence-based guidance on weight management, BMI, and healthy eating. Your GP is the best first point of contact for personalised advice. You can also use our free BMI calculator and weight converter above to assess your current health context and explore healthy weight ranges for your height.
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.