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
Best Online Weight Loss Coach — What Works in the UK
Finding the right online weight loss coach depends on your goals, budget, and whether you need medical support. The best coaches combine evidence-based advice with personalised support, helping you make sustainable lifestyle changes. In the UK, you can access weight management support through NHS services, private coaching, or a combination of both. Some people also benefit from prescription weight loss medication alongside coaching. Understanding your options helps you choose the right approach for your situation.
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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.
What to Look for in an Online Weight Loss Coach
A good online weight loss coach should have recognised qualifications in nutrition, fitness, or health coaching, and understand evidence-based weight loss principles. The best coaches will:
- Assess your individual circumstances rather than offering one-size-fits-all plans
- Focus on sustainable lifestyle changes, not quick fixes or extreme diets
- Provide accountability and regular check-ins to keep you motivated
- Explain the science behind their recommendations
- Respect your food preferences and cultural background
- Help you set realistic goals aligned with NHS weight loss guidance (typically 0.5–1 kg per week)
- Work alongside your GP if you have underlying health conditions
Many coaches use apps or video calls for convenience. The NHS also offers structured weight management programmes through local services, which are free at the point of use. For prescription weight loss medication like Wegovy or Mounjaro, you'll need a prescription from a licensed healthcare professional following a clinical assessment — this is separate from coaching but can be part of a comprehensive weight management approach.
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 Weight Loss Support vs Private Coaching
The NHS offers free weight management support through tier 1 (self-help tools and digital programmes) and tier 2 (primary care-led interventions). These include structured programmes and sometimes referral to specialist services. Private online coaches vary in cost and approach — expect to pay £50–£200+ per month depending on the level of support.
The best approach often combines both: free NHS weight management UK resources with additional private support if needed. Use our free BMI calculator to understand your current status and set baseline goals. Track your progress with our weight loss progress tracker to monitor results over time. Your GP can advise whether NHS tier 3 specialist services (which may include prescription weight loss medication) are appropriate for you. A good coach will encourage you to work with your healthcare team rather than replace them.
Prescription Weight Loss Support and CoachingPrescription weight loss medication like Wegovy (semaglutide) or Mounjaro (tirzepatide) can support weight loss when combined with lifestyle changes. These are GLP-1 medications that may help reduce appetite and support feeling fuller after smaller meals. Eligibility depends on your BMI and health circumstances — your GP or a licensed prescriber will assess whether medication is suitable.
The most effective approach combines prescription support with lifestyle coaching. Clinical evidence shows that medication works best alongside reduced-calorie diet and increased physical activity. Try our GLP-1 weight loss calculator to estimate potential results at different doses, and use our weight converter to track weight loss in both kg and stone. Whether you choose NHS weight loss services, private coaching, medication, or a combination, consistency and realistic expectations are key to sustainable weight management.
- 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 makes an online weight loss coach qualified in the UK?
Look for coaches with credentials from recognised bodies like the REPS (Register of Exercise Professionals), CIMSPA, or qualifications in nutrition (RD or ANutr). They should understand NHS weight loss guidance, be able to signpost to medical professionals, and have continuing professional development. Check their website for qualifications and ask about their experience before signing up.
Can an online coach replace my GP for weight management?
No. A good coach works alongside your GP, not instead of them. If you have underlying health conditions, take medication, or are considering prescription weight loss support, your GP must be involved in your care plan. Coaches provide motivation and lifestyle guidance; your GP provides medical oversight.
Is private online coaching better than NHS weight management UK support?
Both have value. NHS support is free and evidence-based but may have waiting lists. Private coaching offers more personalised attention but costs money. The best approach depends on your preferences, budget, and access. Many people benefit from combining NHS resources with targeted private support for specific goals.
Should I use a weight loss coach if I'm taking Wegovy or Mounjaro?
Yes, coaching can enhance results. Prescription weight loss medication works best alongside lifestyle changes — diet, physical activity, and behaviour change. A coach can help you make these changes sustainable, manage side effects, and stay motivated. Always discuss medication with your prescriber and coach together.
How do I know if an online weight loss coach is trustworthy?
Check for qualifications, read genuine reviews, ask about their approach and philosophy, and verify they encourage you to involve your GP. Be wary of coaches promising clinically studied weight loss, extreme diets, or suggesting they can prescribe medication. A trustworthy coach focuses on sustainable change and works within professional standards.
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.