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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Ideal Weight for a 5ft 9in Female — UK Guide
At 5ft 9in (175cm), the ideal weight for an adult female falls within a specific healthy range based on NHS BMI guidelines. Your ideal body weight depends on your individual frame size, muscle mass, and overall health — but BMI provides a useful framework. For this height, a healthy weight range is approximately 54–73 kg (8st 6lbs–11st 7lbs). Use our free BMI calculator above to check where you sit personally, and remember that health is about much more than a single number.
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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 at 5ft 9in — BMI Explained
According to NHS guidelines, a healthy BMI is between 18.5 and 24.9 for adults. For a female at 5ft 9in (175cm), this translates to a weight range of approximately 54–73 kg, or 8 stone 6 lbs to 11 stone 7 lbs in UK measurements.
- Lower end (BMI 18.5): 54 kg (8st 6lbs) — still a healthy weight
- Mid-range (BMI 21.5): 66 kg (10st 5lbs) — well within healthy range
- Upper end (BMI 24.9): 73 kg (11st 7lbs) — upper healthy threshold
This range is based on population averages and doesn't account for individual differences like muscle mass, bone density, or ethnicity. Women with more muscle may sit higher in this range and still be perfectly healthy. Your GP can provide personalised guidance based on your individual health profile and goals.
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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.
How to Find Your Personal Ideal Weight
Your ideal weight isn't just a number — it's the weight at which you feel healthy, energetic, and free from weight-related health problems. Use our free BMI calculator above to find your personal BMI instantly. Enter your height (5ft 9in) and current weight, and the calculator will show you exactly where you sit on the NHS BMI scale.
For a more complete picture of your health weight for height UK standards, consider these factors: your family history of weight-related conditions, any current health concerns (like blood pressure or blood sugar), and whether you have other weight-related health indicators. If you're concerned about whether your current weight is healthy, book an appointment with your GP — they can assess your individual risk factors and provide tailored advice.
- 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 ideal weight for a 5ft 9in woman in stone?
For a 5ft 9in female, the healthy weight range is approximately 8 stone 6 lbs to 11 stone 7 lbs (54–73 kg) based on NHS BMI guidelines. This assumes a BMI between 18.5 and 24.9. However, ideal weight varies by individual frame size, muscle mass, and health profile — your GP can advise what's right for you specifically.
Is 70kg a healthy weight for someone 5ft 9in?
Yes, 70 kg (11 stone) is within the healthy weight range for a 5ft 9in female. This gives a BMI of approximately 24.2, which sits comfortably in the healthy BMI range of 18.5–24.9 according to NHS guidelines. Use our BMI calculator above to verify your exact BMI based on your current weight.
What does "ideal body weight" actually mean?
Ideal body weight is the weight range at which you're at lowest risk of weight-related health problems and feel physically well. It's based on factors like height, age, sex, and sometimes ethnicity. For most UK adults, the NHS BMI range (18.5–24.9) is used as a guide, though individual health, muscle mass, and personal goals also matter.
Can I use a healthy weight calculator to find my ideal weight?
Yes — our free BMI calculator on this page instantly shows your BMI and healthy weight range for your height. Simply enter your height and weight, and it calculates where you fall on the NHS scale. This gives you a clear, personalised picture of your healthy weight range.
Does ideal weight differ for women vs men at the same height?
The BMI formula is the same regardless of sex, so the healthy weight range (BMI 18.5–24.9) is identical. However, women typically have slightly higher body fat percentages naturally, and may carry weight differently. Your GP or a health professional can discuss what ideal weight means for your individual 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.