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's the Average Weight for UK Adults?
The average weight for UK adults varies by sex, height, and age, but knowing where you stand helps with weight management planning. According to recent Office for National Statistics data, the average UK man weighs approximately 85.7 kg (13 stone 7 lbs) at a height of 175.3 cm, whilst the average UK woman weighs around 71.6 kg (11 stone 3 lbs) at 161.6 cm. However, "average" doesn't necessarily mean "healthy" — what matters is finding your personal healthy weight range based on your individual height and health profile, following 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.
Average UK Weight by Sex and Height
Average weights in the UK (based on ONS data):
- Average man: 85.7 kg (13st 7lbs) at 175.3 cm (5ft 9in)
- Average woman: 71.6 kg (11st 3lbs) at 161.6 cm (5ft 3.5in)
- Average man BMI: approximately 27.9 (overweight category)
- Average woman BMI: approximately 27.4 (overweight category)
These are population averages, not health targets. Your healthy weight depends on your individual height, frame size, muscle mass, and health conditions. Use our free BMI calculator above to find your personal BMI and determine whether your weight falls into the healthy, overweight, or obese category according to NHS thresholds. Remember that BMI is a screening tool — it doesn't account for muscle mass, so athletes may have a higher BMI despite good health.
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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 Range
Rather than comparing yourself to the average, focus on your personal healthy weight range. For any given height, a healthy BMI is 18.5 to 24.9 according to NHS guidance. If you're of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends a slightly lower range of 18.5 to 22.9 due to higher health risks at the same BMI. Use the weight converter on this page to switch between kg, stone, and pounds — then use our BMI calculator to check where you fall. Even a modest weight loss of 5–10% of your current weight can bring meaningful health benefits, including better blood sugar control, lower blood pressure, and reduced joint stress. Your GP can provide personalised guidance on a healthy weight target for you.
- 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 is the average weight for a UK adult?
The average UK man weighs around 85.7 kg (13st 7lbs) at 175.3 cm tall, and the average UK woman weighs approximately 71.6 kg (11st 3lbs) at 161.6 cm. However, average is not the same as healthy — your personal healthy weight depends on your height, age, and health profile.
Is the average UK weight healthy?
The average BMI for UK adults is around 27–27.5, which falls into the overweight category (25–29.9). This reflects a significant proportion of the UK population being above the NHS healthy weight range of BMI 18.5–24.9. Your target should be your personal healthy range, not the population average.
How do I find my healthy weight for my height?
Calculate your BMI using our free BMI calculator on this page. A healthy BMI is 18.5–24.9 for most adults, or 18.5–22.9 if you're of South Asian, Chinese, Black African, or Black Caribbean heritage. Your GP can also advise you on a healthy weight target for your individual circumstances.
How do I convert my weight to stone from kg?
Use our free weight converter above. Alternatively, divide your weight in kg by 6.35 to get stone. For example, 70 kg ÷ 6.35 = approximately 11 stone. You can also multiply kg by 2.2 to convert to pounds.
What should I do if I'm above the healthy weight range?
If your BMI is above 25, you may benefit from weight management support. Sustainable weight loss of 0.5–1 kg per week is recommended. Speak to your GP about safe, evidence-based approaches — whether dietary changes, activity, or structured weight management programmes. NHS weight management services are available through your local health system.
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.