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
Manharo — UK Health Information and Guidance
Manharo is not currently a recognised medication or health term in the UK healthcare system. If you're searching for information about weight management options, prescription injections, or BMI guidance available to UK adults, MyWeightCheck provides free tools and evidence-based information to help you understand your health better. Whether you're interested in understanding your weight in different measurements, calculating your BMI, or learning about NHS-approved weight management approaches, our site offers practical resources tailored to UK health standards and NHS guidance.
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.
Understanding Weight Management Options in the UK
The NHS provides several evidence-based approaches to weight management for UK adults. If you're exploring options for healthy weight loss or want to understand your current health status, the NHS recommends starting with your GP for a personalised assessment. UK-licensed weight management medications available on prescription include tirzepatide (Mounjaro) and semaglutide (Wegovy), both GLP-1 receptor agonist injections that may help support weight loss alongside dietary changes and increased physical activity. Access through the NHS typically involves referral to specialist tier 3 weight management services, though private prescribing options are also available. The NHS emphasises that sustainable weight loss of 0.5–1 kg per week is the safest approach, combined with lifestyle changes rather than medication alone.
- NHS eligibility for prescription weight loss treatment: BMI 30 or above, or BMI 27–29.9 with weight-related health conditions
- Specialist assessment required before any prescription medication
- Lifestyle support and dietary guidance essential alongside pharmacological options
- Regional variation in NHS availability—your GP can discuss local services
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.
Free Tools and Resources for UK Health Assessment
MyWeightCheck offers free, NHS-aligned tools to help you understand your health better. Use our free BMI calculator to check where your weight falls according to NHS guidelines, or try our weight converter to switch between kg, stone, and pounds—the standard measurements used in UK healthcare and everyday life. If you're interested in exploring prescription weight management options, our GLP-1 weight loss calculator can help you understand potential outcomes based on clinical trial data. These tools complement NHS guidance and are designed to support informed conversations with your GP, not replace medical advice. Your GP remains the best source for personalised health assessment and treatment recommendations tailored to your individual circumstances.
- 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 weight management options are available to UK adults?
The NHS offers several approaches: lifestyle programmes (tier 1), primary care interventions (tier 2), specialist weight management services (tier 3), and bariatric surgery (tier 4). Prescription medications like Mounjaro and Wegovy are available through NHS specialist services or private prescribing. Your GP can discuss which option suits your circumstances.
How can I check if I'm at a healthy weight according to NHS standards?
Use our free BMI calculator on this page to check your personal BMI. According to NHS guidelines, a healthy BMI is 18.5–24.9 for most adults (lower thresholds apply for some ethnic groups). Your GP can also provide personalised weight guidance.
What is the NHS recommended rate of weight loss?
The NHS recommends losing no more than 0.5–1 kg (1–2 lbs) per week for sustainable, safe results. Faster loss is possible with medical support but increases muscle loss risk. Lifestyle changes alongside any treatment are essential.
How do I access weight management medication on the NHS?
Ask your GP for a referral to your local specialist tier 3 weight management service. They'll assess whether prescription medication is appropriate. NHS availability varies by region and can involve waiting lists. Private online prescribing is also available.
What's the difference between Mounjaro and Wegovy?
Both are prescription injections for weight management. Mounjaro (tirzepatide) is a dual GIP+GLP-1 agonist; Wegovy (semaglutide) is a GLP-1 agonist. Clinical trials showed Mounjaro may support slightly greater average weight loss, but individual results vary significantly. Your prescriber will assess which suits you.
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.