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
Average Weights for Women in the UK
The average weight for UK women is approximately 71.6 kg (11 stone 3 lbs), though this varies significantly by age, height, and individual factors like muscle mass and genetics. Understanding average weights can be helpful context, but what matters most for your health is whether your personal weight falls within a healthy BMI range for your height. Our BMI calculator can help you assess your individual health status quickly and accurately.
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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.
Average UK Woman Weight by Age Group
Weight varies considerably across different age groups due to natural changes in metabolism, muscle mass, and lifestyle factors. Women aged 16–24 have an average weight of approximately 65 kg (10 stone 3 lbs), while women aged 25–34 average around 72 kg (11 stone 4 lbs). By age 35–44, the average rises to approximately 75 kg (11 stone 11 lbs), and women aged 45–54 average around 77 kg (12 stone 1 lb). These figures are based on UK Office for National Statistics (ONS) data and reflect population averages, not targets. Individual healthy weights depend entirely on your height, bone structure, and muscle composition. Use our free weight converter to check what your weight means in stone, kilograms, or pounds for easy reference with NHS health guidelines.
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.
Healthy Weight Ranges and BMI Context
Knowing the average weight is interesting context, but your healthy weight range depends on your height. According to NHS guidance, a healthy BMI falls between 18.5 and 24.9. For a woman of average UK height (approximately 161.6 cm or 5 feet 3.5 inches), the healthy weight range is roughly 48–65 kg (7 stone 7 lbs to 10 stone 3 lbs). For women of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower thresholds: a healthy BMI is 18.5–22.9. Calculate your personal healthy weight range using our free BMI calculator, which shows exactly where you sit relative to NHS health guidance for your specific height.
- 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 woman in the UK?
According to Office for National Statistics data, the average UK woman weighs approximately 71.6 kg (11 stone 3 lbs). However, this is a population average and varies significantly by age, height, and individual factors. Your personal healthy weight depends on your height and health status, not on this average figure.
Is the average weight for women healthy?
The UK average weight for women corresponds to a BMI of approximately 27.4, which falls in the "overweight" category according to NHS guidelines. This reflects broader population trends but doesn't indicate whether any individual's weight is healthy for them. Use our BMI calculator to assess your personal health status based on your height.
How does weight change as women get older?
Weight typically increases gradually with age due to changes in metabolism, muscle loss, and lifestyle factors. Women aged 16–24 average around 65 kg, rising to approximately 77 kg by age 45–54. However, this is normal population variation — healthy weight for any individual depends on their specific height and health circumstances.
What is a healthy weight for my height?
A healthy weight depends on your height. Use our free BMI calculator to find your personal healthy weight range. For most adults, a BMI between 18.5–24.9 indicates a healthy weight according to NHS guidelines. If you have specific health concerns, your GP can provide personalised guidance.
How do I know if my weight is healthy?
The best way to assess whether your weight is healthy is to calculate your BMI using your height and current weight. Our free BMI calculator shows this instantly and provides NHS context. A healthy BMI is 18.5–24.9 for most adults, or 18.5–22.9 for people of South Asian or Black heritage. Your GP can also discuss your personal health goals.
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.