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 Personal Trainer Near Me — UK Options & Medication Support
Looking for a personal trainer to support your weight loss journey? In the UK, trainers can be valuable, but prescription weight management medication may also be an option if you're eligible. This guide explains UK-licensed weight loss medications, how to check if you qualify, and how to combine professional support with evidence-based treatment. Whether you're working with a trainer or exploring medication options, understanding what's available can help you choose the right approach for your health goals.
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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 Medications
If you have a BMI of 30 or above—or a BMI of 27 to 29.9 with weight-related health conditions—you may be eligible for prescription weight management medication in the UK. Three main options are currently licensed for weight management:
- Mounjaro (tirzepatide) — a once-weekly injection that works on two appetite-regulating pathways. In clinical trials, participants lost an average of 15–21% of their body weight over 72 weeks alongside diet and exercise changes.
- Wegovy (semaglutide) — a once-weekly GLP-1 injection. Clinical trials showed average weight loss of around 15% body weight at the maximum dose over 68 weeks.
- Saxenda (liraglutide) — a daily injection option, approved for weight management in eligible adults.
All three are prescription-only and require a clinical assessment before being prescribed. Individual results vary significantly. These medications work best when combined with dietary changes and increased physical activity—they are not replacements for lifestyle change, but can support it.
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 vs Private Access & How to Get Started
NHS access: You can ask your GP to refer you to a specialist tier 3 weight management service. NHS availability varies by region, and waiting lists can be lengthy. Your GP will assess whether prescription treatment is appropriate for you.
Private access: Prescription weight loss medication is available through GPhC-registered online services following a clinical assessment. This route does not require an NHS referral.
Use our free BMI calculator on this page to check your starting point, and our GLP-1 weight loss calculator to explore potential outcomes with medication. Start by speaking with your GP about weight management options in your area—they can advise on NHS services, eligibility criteria, and whether prescription treatment is suitable alongside your training.
- 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.
Can I use a personal trainer and weight loss medication together?
Yes. Prescription weight loss medication works best alongside dietary changes and increased physical activity. A personal trainer can help you build exercise habits and strength, while medication may support appetite control and reduce food cravings. Always inform both your trainer and prescriber about all treatments you're using.
What BMI do I need to be eligible for weight loss medication in the UK?
You're typically eligible if you have a BMI of 30 or above, or a BMI of 27 to 29.9 with at least one weight-related health condition such as type 2 diabetes, high blood pressure, or sleep apnoea. Lower thresholds may apply if you're of South Asian, Chinese, Black African, or Black Caribbean heritage. Your GP or prescriber will assess your individual situation.
How much weight can I expect to lose with prescription medication?
Clinical trials show average weight loss of 15–21% of body weight over several months, depending on the medication and dose. However, individual results vary significantly. Weight loss also depends on your diet, exercise, and how consistently you use the medication. Never expect assured outcomes—your prescriber will discuss realistic expectations for you personally.
Is weight loss medication available on the NHS?
Yes, NICE has approved tirzepatide (Mounjaro) and other weight loss medications for use within NHS specialist weight management services. Access is through tier 3 specialist services, typically via GP referral. Availability and waiting times vary significantly by region. Ask your GP about services in your area.
How do I find out if I'm eligible for weight loss treatment?
The first step is to speak with your GP. They can assess your BMI, health history, and any weight-related conditions. Use our free BMI calculator to check your starting point, then book a GP appointment to discuss weight management options available to you. Your GP can refer you to specialist services or discuss private options if appropriate.
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.