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
What Is the Average UK Weight?
The average UK adult weight has increased significantly over recent decades. According to the latest Office for National Statistics (ONS) data, the average UK adult man weighs approximately 85.7 kg (13 stone 7 lbs), whilst the average UK adult woman weighs approximately 71.6 kg (11 stone 3 lbs). However, average weight is not the same as healthy weight. The NHS provides specific UK health guidance based on BMI and individual health factors, not population averages. Understanding where your weight sits in relation to NHS healthy weight ranges is more important for your health than matching the population average.
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 Weight Statistics & NHS Health Guidance
Current UK health information shows that approximately 63% of UK adults are classified as overweight or obese according to NHS BMI categories. The average UK adult man is approximately 175.3 cm tall (5ft 9in) with an average BMI of around 27.9, whilst the average UK adult woman is approximately 161.6 cm tall (5ft 3.5in) with an average BMI of around 27.4. This means the population average falls into the overweight category according to NHS guidance, which defines healthy BMI as 18.5 to 24.9. For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower BMI thresholds starting at 18.5 to 22.9 for healthy weight, reflecting higher health risks at lower BMI levels in these populations. Use our free BMI calculator above to check your personal BMI and see where you fall within NHS health categories. Remember that average weight tells us about population trends, but your individual health depends on your personal BMI, waist circumference, and overall fitness rather than matching a statistical average.
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.
Finding Your Healthy Weight & Next Steps
Your healthy weight UK range depends on your height and individual health factors, not the population average. The NHS recommends aiming for a BMI between 18.5 and 24.9 for most adults. To find your specific healthy weight range, use our weight converter to see your weight in both metric and imperial units, then check it against NHS BMI guidance. If you're concerned about your weight or whether it's affecting your health, speak to your GP. They can provide personalised nhs health advice based on your medical history, offer support with weight management, and refer you to appropriate services if needed. You can also use our free progress tracker to monitor changes over time and set sustainable health goals aligned with NHS guidance.
- 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 the average UK weight a healthy weight?
No. The population average (85.7 kg for men, 71.6 kg for women) falls into the overweight BMI category. A healthy weight depends on your individual height and health factors, not the population average. The NHS recommends a BMI of 18.5 to 24.9 for most adults.
How do I find my healthy weight range?
Calculate your BMI using our free BMI calculator above, or work with your GP. For your height, the NHS healthy weight range is typically between a BMI of 18.5 and 24.9. Use our weight converter to see your target range in stone, pounds, and kilograms.
What if I'm heavier than the average UK weight?
Many factors influence individual weight including genetics, medical conditions, medications, and lifestyle. Being heavier than the average doesn't automatically mean health issues, but it's worth discussing with your GP. They can assess your personal health and suggest support if needed.
Do different ethnicities have different healthy weight ranges?
Yes. The NHS recommends lower BMI thresholds for adults of South Asian, Chinese, Black African, and Black Caribbean heritage because these groups face higher health risks at lower BMI levels. Discuss your personal healthy weight range with your GP.
How can I work towards a healthy weight?
The NHS recommends sustainable lifestyle changes including a balanced reduced-calorie diet and increased physical activity. Your GP can support you, and tier 3 specialist weight management services are available through the NHS in many areas. Track your progress with our free progress tracker.
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.