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 Human Weight in the UK?
The average weight of UK adults varies by age, sex, and other factors, but current data shows the typical adult man weighs around 85.7 kg (13 stone 7 lbs) and the typical adult woman weighs around 71.6 kg (11 stone 3 lbs). However, "average" does not mean "healthy" — weight management and health depend on your individual height, age, and medical history. Understanding how your weight relates to NHS health guidance is more useful than comparing yourself to population averages alone.
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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 Adult Weight Statistics and NHS Context
According to the latest Office for National Statistics (ONS) data, the average UK adult man weighs 85.7 kg (13 stone 7 lbs) and is approximately 175.3 cm (5 feet 9 inches) tall. The average UK adult woman weighs 71.6 kg (11 stone 3 lbs) and is approximately 161.6 cm (5 feet 3.5 inches) tall. This gives an average BMI of around 27.9 for men and 27.4 for women — both in the overweight category according to NHS guidelines.
These statistics represent the middle point of the UK adult population, not a health target. Around 63% of UK adults are overweight or obese (BMI 25 or above), and 28% are obese (BMI 30 or above). Weight varies significantly based on age, sex, genetics, medical conditions, and lifestyle factors. The NHS emphasises that a healthy weight for each person depends on their individual height, not on population averages. Use our free BMI calculator to find your personal healthy weight range — this is far more relevant to your health than comparing yourself to national averages.
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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 — NHS Guidance
The NHS defines a healthy weight as a BMI between 18.5 and 24.9 — regardless of what the population average is. For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower thresholds (BMI 18.5 to 22.9) due to higher health risk at lower weights in these populations. Rather than focusing on whether your weight matches the average, assess your health using our weight converter to check your weight in different units, then calculate your personal BMI. If you're concerned about your weight or health, your GP can provide personalised guidance and support tailored to your individual circumstances, medical history, and health goals.
- 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 average UK adult weight falls into the overweight category by NHS standards. Average does not equal healthy. Your personal healthy weight depends on your individual height, age, and medical factors, not population averages. Use the BMI calculator on this page to find your specific healthy weight range.
What is the average weight for UK men and women?
The average UK adult man weighs around 85.7 kg (13 stone 7 lbs) and stands 175.3 cm tall. The average woman weighs around 71.6 kg (11 stone 3 lbs) and stands 161.6 cm tall. However, healthy weight varies significantly between individuals based on height, muscle mass, and other factors.
How has average UK weight changed over time?
UK average adult weight has increased significantly over the past 30 years. This reflects global trends toward higher average body weights. However, this rise does not change individual health recommendations — NHS guidelines for healthy BMI remain the same regardless of population trends.
How do I know if my weight is healthy?
Calculate your BMI using your height and weight. The NHS healthy range is BMI 18.5 to 24.9 (or 18.5 to 22.9 for South Asian, Chinese, Black African, or Black Caribbean adults). Your GP can also assess your individual health and provide personalised advice about weight management.
Should I try to weigh the same as the average person?
No — aiming for the population average is not a health goal, since the average UK adult weight is actually in the overweight category. Instead, focus on achieving your personal healthy BMI range based on your height, and consult your GP if you have concerns about your weight or health.
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.