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
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Average Weight for Females in the UK
The average weight for UK adult females is approximately 71.6 kg (11 stone 3 lbs), according to the latest Office for National Statistics data. However, average weight varies significantly by age, height, and body composition. Rather than focusing on a single "ideal" number, the NHS recommends using a healthy weight range based on your individual height and build. Use our free BMI calculator to discover your personalised healthy weight range, expressed in both kg and stone so you can easily track your progress.
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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 Female Weight by Age and Height in the UK
Average UK female weight (all adults): 71.6 kg (11 stone 3 lbs)
Weight varies considerably across age groups and heights. Here's a realistic snapshot:
- Ages 16–24: Average around 68 kg (10 stone 11 lbs)
- Ages 25–34: Average around 71 kg (11 stone 2 lbs)
- Ages 35–44: Average around 74 kg (11 stone 8 lbs)
- Ages 45–54: Average around 76 kg (12 stone)
- Ages 55–64: Average around 77 kg (12 stone 1 lb)
- Ages 65+: Average around 74 kg (11 stone 8 lbs)
Average height for UK females is 161.6 cm (5 feet 3.5 inches). At this height, the healthy weight range according to NHS guidelines is approximately 50–67 kg (7 stone 12 lbs to 10 stone 8 lbs).
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.
Finding Your Healthy Weight Range
Rather than chasing an "ideal" number, the NHS recommends a healthy weight range based on your height and BMI. A healthy BMI falls between 18.5 and 24.9 for most adults, though lower thresholds apply for people of South Asian, Chinese, Black African, or Black Caribbean heritage.
Your ideal body weight depends on multiple factors beyond age and height. Use our free BMI calculator above to instantly discover your personalised healthy weight range in both kg and stone. You can also use our weight converter to compare measurements across units, and our progress tracker to monitor your journey if you're working towards a health goal.
Factors That Affect Ideal Female WeightMuscle mass: Muscle is denser than fat, so two people at the same weight can look very different. An athletic woman may have a higher weight on the scales but lower body fat percentage.
Frame size: Small, medium, and large frames affect ideal weight. A woman with a large frame may have a naturally higher healthy weight than someone with a small frame at the same height.
Age: Metabolism slows with age, and muscle mass decreases naturally. Weight gain in middle age is common even without dietary changes.
Ethnicity: The NHS recognises that people from South Asian, Chinese, and Black African or Caribbean backgrounds have higher health risks at lower BMI levels. Lower healthy weight ranges may apply.
Medical conditions and medications: Conditions like thyroid disorders, PCOS, and certain medications can affect weight regulation independently of calorie intake.
- 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 5 foot 5 inch female in the UK?
For a female of 5 feet 5 inches (165 cm), the average weight is approximately 70 kg (11 stone). However, the healthy weight range at this height is roughly 50–67 kg (7 stone 12 lbs to 10 stone 8 lbs), based on NHS BMI guidelines. Individual healthy weight depends on factors like muscle mass and frame size.
What is considered a healthy weight for females in the UK?
The NHS defines a healthy weight as a BMI between 18.5 and 24.9. This translates to different weight ranges depending on height. For example, at 5 feet 6 inches, a healthy weight is approximately 50–67 kg (7 stone 12 lbs to 10 stone 8 lbs). Use your height-specific range as your guide rather than a single "ideal" number.
Is there a difference between average weight and healthy weight?
Yes. Average weight is what most people in a population actually weigh. Healthy weight is what medical evidence suggests supports good health, based on BMI and individual factors. As obesity rates have increased, average weight is now higher than healthy weight for many age groups. Your goal should be a healthy weight range, not the average.
Does muscle mass affect what the scales say?
Absolutely. Muscle is denser than fat, so building muscle can increase your weight on the scales even if you're losing fat and your clothes fit better. This is why BMI has limitations and why body composition matters. A strength-training woman may weigh more than expected but be very healthy.
How does age affect healthy weight for females?
Natural weight gain occurs with age due to declining metabolism and muscle loss. However, healthy weight ranges adjust for age through BMI, not fixed numbers. An older woman may have a higher healthy weight at the same height as a younger woman, but the BMI target (18.5–24.9) remains the same. Your GP can advise on healthy targets for your age and circumstances.
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.