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
Weight Loss Training Program Free — With UK Medication Options
If you're looking for a free weight loss training program in the UK, you have several options—from NHS support services to lifestyle changes backed by clinical evidence. However, for eligible adults, prescription weight management medication like Mounjaro and Wegovy can significantly support weight loss when combined with structured training and dietary changes. This guide explains the medication options available through the NHS and privately, who qualifies, and how to get started on your weight loss journey.
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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-Licensed Prescription Weight Loss Medication
Three prescription medications are licensed in the UK for weight management: Mounjaro (tirzepatide), Wegovy (semaglutide), and Saxenda (liraglutide). Both Mounjaro and Wegovy are once-weekly injections, while Saxenda is a daily injection. Clinical trials have shown that these GLP-1 and GIP/GLP-1 medications can support significant weight loss—Mounjaro users lost an average of 15–21% of their body weight in trials, and Wegovy users lost approximately 15% on average—though individual results vary considerably.
To be eligible for these prescription medications, you typically need a BMI of 30 or above, or 27–29.9 with a weight-related health condition (such as type 2 diabetes, high blood pressure, or sleep apnoea). For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, lower BMI thresholds apply. These medications work alongside a reduced-calorie diet and increased physical activity—they're not replacements for lifestyle changes, but powerful tools to support your training program.
Use our free BMI calculator above to check if you fall within the eligible range, and try our GLP-1 weight loss calculator to estimate 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.
Accessing Weight Loss Medication: NHS vs Private
NHS access: Prescription weight loss medication is available through specialist tier 3 weight management services, which your GP can refer you to. However, NHS availability varies significantly by region, and waiting times can be lengthy in some areas. Your GP can discuss whether you're eligible and help you access local services.
Private access: You can also obtain these medications through GPhC-registered online prescribers following a clinical assessment—no NHS referral needed. Costs typically range from £129–£320 per month depending on dose. Either route requires a prescription and clinical assessment to ensure the medication is safe and appropriate for you. Start by speaking with your GP or contacting a private prescriber to understand your options and confirm eligibility.
Track your weight management progress using our free progress tracker once you begin your training program and any 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.
What's the difference between a free weight loss training program and prescription medication?
A free weight loss training program focuses on lifestyle changes—exercise, diet, and behaviour modification—which form the foundation of sustainable weight loss. Prescription medications like Mounjaro and Wegovy enhance these efforts by reducing appetite and supporting feeling fuller, but they work alongside training and dietary changes, not instead of them. Both approaches together are most effective.
How do I know if I'm eligible for prescription weight loss medication in the UK?
You're typically eligible if you have a BMI of 30 or above, or 27–29.9 with a weight-related health condition like type 2 diabetes or high blood pressure. For adults of certain ethnicities (South Asian, Chinese, Black African, or Black Caribbean), lower thresholds apply. Use our free BMI calculator above to check your starting point, then speak with your GP.
Can I get weight loss medication free on the NHS?
Yes, prescription weight loss medications are available through NHS specialist weight management services, though access varies by region and waiting lists can be lengthy. Your GP can refer you if you're eligible. Alternatively, private prescribers offer these medications, typically costing £129–£320 monthly depending on dose and medication type.
Do I need to combine medication with a training program?
Yes. Prescription weight loss medications are most effective when used alongside a reduced-calorie diet and regular physical activity. The medication supports appetite regulation, but your training program and dietary choices remain essential for sustainable weight loss and long-term health.
What's the average weight loss with UK-licensed weight loss medication?
Clinical trials showed that Mounjaro users lost an average of 15–21% of their body weight, while Wegovy users lost approximately 15%. However, individual results vary significantly based on dose, adherence, diet, and exercise. Our GLP-1 weight loss calculator can help you estimate potential outcomes.
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.