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
Does Peppermint Tea Help With Weight Loss?
Peppermint tea has been traditionally used to support digestion and may offer minor digestive benefits, but there is limited scientific evidence that it directly causes weight loss. While staying hydrated and choosing low-calorie beverages is sensible for weight management in the UK, more substantial weight loss often requires additional support. If you're looking for clinically proven weight management options, prescription weight loss medication is available for eligible adults through NHS services or private prescribing.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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
If you're interested in evidence-based weight loss medication in the UK, several prescription weight loss injections are now available on the NHS and through private prescribing. These GLP-1 medications have been clinically shown to support weight loss when used alongside a reduced-calorie diet and increased physical activity.
- Mounjaro (tirzepatide) — a dual GIP and GLP-1 receptor agonist, licensed for eligible UK adults with a BMI of 30 or above, or 27–29.9 with weight-related health conditions. Clinical trials showed average weight loss of 15–21% of body weight.
- Wegovy (semaglutide) — a GLP-1 injection taken once weekly, with average weight loss around 15% of body weight in clinical trials.
- Saxenda (liraglutide) — a daily GLP-1 injection, also licensed for weight management in the UK.
All three medications are prescription-only and require a clinical assessment to determine eligibility. Results vary between individuals, and they work best alongside lifestyle changes.
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 and Next Steps
In the UK, you can access prescription weight loss medication through two routes. The NHS route involves referral to a tier 3 specialist weight management service through your GP, though waiting times and availability vary significantly by region. The private route offers faster access through online consultations with UK-licensed prescribers, with medications dispensed by GPhC-registered pharmacies.
If you're interested in exploring whether prescription weight loss treatment is right for you, start by speaking with your GP about your weight management goals. They can assess your BMI, discuss any weight-related health conditions, and explain the options available in your area. Try our free BMI calculator to check your current BMI category, and use our GLP-1 weight loss calculator to see potential weight loss projections with different prescription options.
- 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.
Is peppermint tea effective for weight loss?
Peppermint tea may support digestion and is a calorie-free hydrating beverage, but there is limited scientific evidence that it directly causes weight loss. For more substantial and sustained weight loss, prescription weight loss medication or lifestyle changes are typically more effective.
What is the difference between Mounjaro and Wegovy for weight loss?
Mounjaro is a dual GIP and GLP-1 agonist, while Wegovy is a GLP-1 agonist only. Clinical trials showed Mounjaro achieved slightly higher average weight loss (15–21% vs approximately 15%), but both are effective. Your GP or prescriber will advise which is more suitable for you.
How do I know if I'm eligible for prescription weight loss medication in the UK?
You may be eligible if your BMI is 30 or above, or 27–29.9 with a weight-related health condition such as type 2 diabetes, high blood pressure, or sleep apnoea. Speak to your GP for a personal assessment, or use our BMI calculator to check your current category.
Can I get weight loss injections on the NHS?
Yes, prescription weight loss medications like Mounjaro and Wegovy are available through NHS specialist tier 3 weight management services, though availability and waiting times vary by region. Private access through online prescribing is also available without an NHS referral.
What is the best way to track weight loss progress?
Track your progress consistently using the same scales, same time of day, and same clothing. Our free progress tracker on this site lets you log weight changes over time and visualise your journey. Remember that weight fluctuates daily due to water retention and food intake — focus on trends over weeks, not daily changes.
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.