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 a Normal Person Weight in the UK?
There's no single "normal" weight that applies to everyone—it depends on your height, age, sex, and body composition. However, the NHS defines a healthy weight range using BMI (body mass index), which applies to most UK adults. Understanding where your weight falls in the healthy weight guide can help you assess your personal health and whether your current weight supports your wellbeing. This guide explains UK health guidance on normal weight, average weights for UK adults, and how to check if your weight is within a healthy range for you.
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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 Average Weights and NHS Healthy Weight Ranges
According to the Office for National Statistics, the average UK adult man weighs approximately 85.7 kg (13st 7lbs) at a height of 175.3 cm (5ft 9in), while the average UK adult woman weighs approximately 71.6 kg (11st 3lbs) at 161.6 cm (5ft 3.5in). However, "average" is not the same as "healthy."
The NHS defines a healthy weight range using BMI categories:
- Healthy weight: BMI 18.5–24.9
- Overweight: BMI 25.0–29.9
- Obese: BMI 30.0 and above
Your healthy weight range depends on your height. For example, at 5ft 8in (1.73m), a healthy weight falls between approximately 55.4 kg (8st 10lbs) and 74.5 kg (11st 10lbs). Use our free BMI calculator above to find your personal healthy weight range instantly, and our weight converter to switch between kg, stone, and pounds.
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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.
Important UK Guidance on Healthy Weight
For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower BMI thresholds because these groups face higher risk of type 2 diabetes and heart disease at lower weights. Their healthy weight range is BMI 18.5–22.9.
Remember that BMI doesn't account for muscle mass—athletes may have a higher BMI but lower body fat. Your GP can give you personalised NHS health advice about what a healthy weight means for you specifically. If you're concerned about your weight or want guidance on weight management, contact your GP. They can assess your individual health, discuss any weight-related conditions, and recommend appropriate support.
- 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 is normal for a UK adult?
Normal weight varies by height and body composition. The NHS defines a healthy weight using BMI (18.5–24.9 for most adults). For example, at 5ft 8in, healthy weight is roughly 55–74 kg (8st 10lbs–11st 10lbs). Use our free BMI calculator to find your personal healthy weight range based on your exact height.
What is the average weight of UK adults?
The average UK man weighs approximately 85.7 kg (13st 7lbs) and the average UK woman weighs approximately 71.6 kg (11st 3lbs). However, average weight is not the same as healthy weight—many UK adults are above the NHS healthy weight range.
How do I know if my weight is healthy?
Calculate your BMI using your height and current weight—use our free BMI calculator above. If your BMI falls between 18.5 and 24.9, you're in the healthy range according to NHS guidance. Your GP can also assess whether your weight is healthy for you personally.
Does normal weight apply to everyone the same way?
No. Healthy weight varies significantly by height, age, sex, and body composition. The NHS also recommends lower BMI thresholds for South Asian, Chinese, Black African, and Black Caribbean adults. Your GP can give you personalised health advice about what's normal and healthy for you.
Can I be overweight on the BMI scale but still be healthy?
BMI doesn't measure body fat or account for muscle mass—athletes may have higher BMI but lower body fat. However, if your BMI is above 25, your GP can assess your individual health and discuss whether weight management might benefit you. Waist measurement and overall fitness also matter.
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.