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 Weight for the Human Body?
Normal weight varies significantly between individuals based on height, age, muscle mass, and frame size. According to NHS guidelines, a healthy weight range is defined by a BMI (Body Mass Index) between 18.5 and 24.9, though this can be calculated more precisely for your specific height. The average UK adult man weighs approximately 85.7 kg (13 stone 7 lbs) and the average UK adult woman weighs approximately 71.6 kg (11 stone 3 lbs), though these figures represent current averages rather than ideal weights. Use our free BMI calculator above to find your personal healthy weight range based on your height.
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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.
Healthy Weight Range for Different Heights
Your ideal body weight depends primarily on your height. The NHS healthy weight range is defined using BMI thresholds: a BMI of 18.5 to 24.9 is considered healthy for most UK adults. Here are examples of healthy weight ranges for common UK heights:
- 5ft 3in (160cm) — approximately 45–64 kg (7 stone 1 lb to 10 stone)
- 5ft 6in (168cm) — approximately 51–72 kg (8 stone to 11 stone 5 lbs)
- 5ft 9in (175cm) — approximately 56–79 kg (8 stone 12 lbs to 12 stone 6 lbs)
- 5ft 11in (180cm) — approximately 60–85 kg (9 stone 6 lbs to 13 stone 6 lbs)
- 6ft 0in (183cm) — approximately 63–89 kg (10 stone to 14 stone)
These weight for height UK ranges assume average frame size and adult age. The weight converter tool on this page helps you convert between kg, stone, and pounds instantly for any weight value you're considering.
Clinically BackedWeight Loss
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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.
Factors That Affect Your Ideal Weight
Ideal weight is not one-size-fits-all. Several factors influence what a normal weight means for you personally:
- Muscle mass: Muscle is denser than fat. Athletes and people with high muscle mass may have a higher BMI within the healthy range without excess body fat
- Frame size: Bone structure varies — people with larger frames naturally weigh more at the same height
- Age: Metabolism changes with age; healthy weight ranges remain the same, but maintaining muscle becomes more important
- Ethnicity: NHS guidance recommends lower BMI thresholds for South Asian, Chinese, Black African, and Black Caribbean populations due to higher health risk at equivalent BMI levels
- Medical conditions: Certain medications and health conditions affect weight independently of calorie intake
An NHS healthy weight calculator or your GP can provide personalised guidance for your individual situation.
- 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 counts as normal weight for adults in the UK?
According to NHS guidelines, a normal healthy weight corresponds to a BMI between 18.5 and 24.9. This applies to most UK adults. However, for people of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends slightly lower thresholds (BMI 18.5 to 22.9) because these groups face higher health risks at equivalent BMI levels. Your GP can advise on what healthy weight means for you personally.
How do I calculate my ideal weight range for my height?
Use the BMI calculator on this page to enter your height and current weight — it will show you your personal healthy weight range instantly. Alternatively, multiply your height in metres squared by 18.5 (lower bound) and 24.9 (upper bound) to calculate the healthy range in kg. For example, if you're 1.75m tall, your healthy range is approximately 56–76 kg (8 stone 12 lbs to 12 stone). Our healthy weight calculator provides instant, personalised results.
Why is muscle mass important when discussing normal weight?
Muscle tissue is denser than fat tissue, so people with high muscle mass may weigh more while having lower body fat percentages. BMI alone doesn't distinguish between muscle and fat. This is why athletes sometimes have a "high" BMI despite being fit. Body composition (muscle vs fat percentage) matters more than weight alone. Your GP can discuss this with you if you have concerns about your weight despite feeling fit.
Does age affect what is considered a normal weight?
The healthy BMI range (18.5–24.9) remains the same across adulthood, but metabolic changes with age mean maintaining muscle mass becomes increasingly important. Older adults may have lower muscle mass but similar weight — this is normal ageing. Regular physical activity helps preserve muscle as you age. If you're concerned about weight changes related to age, discuss this with your GP.
What is the average weight in the UK and how does it compare to healthy weight?
The average UK adult man weighs approximately 85.7 kg (13 stone 7 lbs) at an average height of 175.3 cm, giving an average BMI of around 27.9 (overweight category). The average UK adult woman weighs approximately 71.6 kg (11 stone 3 lbs) at 161.6 cm, with an average BMI of 27.4. These averages have increased over recent decades. However, average weight is different from healthy weight — the NHS healthy weight target remains a BMI of 18.5–24.9.
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.