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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Ideas For Rewards For Weight Loss in the UK
Celebrating milestones during your weight management journey can help keep you motivated. Whether you're making lifestyle changes alone or with the support of prescription weight loss medication available in the UK, having meaningful rewards (beyond food) can reinforce your progress. This guide explores practical reward ideas and introduces you to prescription options like Mounjaro and Wegovy that many UK adults are now using to support sustainable weight loss alongside behaviour change.
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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.
UK Prescription Weight Loss Options
For eligible UK adults, prescription weight management medication can support your weight loss journey alongside lifestyle changes. The main options are:
- Mounjaro (tirzepatide) — a once-weekly GLP-1 injection that may help reduce appetite and support weight management. In clinical trials, participants lost an average of 15–21% of their body weight.
- Wegovy (semaglutide) — a once-weekly GLP-1 injection that may help you feel fuller after smaller meals. Clinical data showed average weight loss of around 15% of body weight.
- Saxenda (liraglutide) — a once-daily injection option, though less commonly used than Mounjaro or Wegovy.
You may be eligible if your BMI is 30 or above, or 27 or above with weight-related health conditions like type 2 diabetes or high blood pressure. Our GLP-1 weight loss calculator can help you explore potential outcomes at different 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.
Getting Started: NHS vs Private Access in the UK
In the UK, you can access prescription weight loss medication through two main routes. The NHS prescribes these medications through specialist tier 3 weight management services, though availability varies by region and waiting lists can be lengthy. Private access is available through GPhC-registered online pharmacies following a clinical assessment with a UK-licensed prescriber.
Whether you choose NHS or private, speak to your GP first. They can assess your eligibility, discuss your health goals, and help you understand whether prescription medication is right for you. Use our free BMI calculator to check your starting point, and track your progress using our weight loss progress tracker throughout your journey.
- 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 are good non-food rewards for weight loss?
Great non-food rewards include new fitness clothes or trainers, a massage or spa treatment, a day trip or experience, new hobbies or equipment (yoga mat, journal), upgrading your bedroom, concert or cinema tickets, or investing in items that support your health goals. The key is choosing rewards that feel meaningful to you and reinforce positive habits rather than undoing progress.
Can I use prescription weight loss medication in the UK without seeing a GP?
Prescription medications like Mounjaro and Wegovy require a clinical assessment by a UK-licensed prescriber. You don't need a GP referral for private prescribing, but it's advisable to inform your GP before starting any medication. If accessing through the NHS, a GP referral to specialist services is necessary.
How often should I set weight loss milestones and rewards?
Setting milestones every 5–10% of your target weight loss works well for many people. This could mean a reward every 3–6 months depending on your goals and progress rate. Celebrate non-scale victories too — improved energy, better sleep, or reduced joint pain — not just the number on the scales.
What is the average weight loss with Mounjaro or Wegovy in the UK?
In clinical trials, Mounjaro resulted in average weight loss of 15–21% of body weight, while Wegovy showed average weight loss around 15%. Individual results vary significantly and depend on your starting weight, dose, diet, and physical activity. Your prescriber can discuss realistic expectations for you.
How do I know if I'm eligible for prescription weight loss medication on the NHS?
NHS eligibility typically requires a BMI of 30 or above, or 27 or above with weight-related health conditions (diabetes, high blood pressure, sleep apnoea, etc.). Access is through specialist tier 3 weight management services, which requires a GP referral. Use our BMI calculator to check your current BMI, then ask your GP about referral options in your area.
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.