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 5'9" Female — UK Health Data
For a woman who is 5'9" (175cm) tall, the healthy weight range according to NHS guidelines is approximately 55–74 kg, or 8 stone 8 lbs to 11 stone 9 lbs. This range is based on a healthy BMI of 18.5 to 24.9. However, ideal body weight varies between individuals depending on factors like muscle mass, frame size, and ethnicity. Use our free BMI calculator above to find your personal healthy weight range and understand what that means for your health.
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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 at 5'9" — Data by BMI Category
At 5'9" (175cm), here's how your weight aligns with NHS BMI categories:
- Underweight: Below 8 stone 2 lbs (52 kg)
- Healthy weight: 8 stone 8 lbs to 11 stone 9 lbs (55–74 kg)
- Overweight: 11 stone 10 lbs to 13 stone 2 lbs (75–84 kg)
- Obese: Above 13 stone 3 lbs (85 kg)
The healthy weight range reflects a BMI of 18.5–24.9, which the NHS recognises as reducing risk of weight-related health conditions. However, BMI has limitations—it doesn't account for muscle mass, so athletes may have a higher BMI while remaining healthy. For a more complete picture, consider your waist circumference: the NHS recommends keeping it below 80cm (31.5 inches) for women to reduce cardiovascular risk.
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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 Affecting Your Ideal Weight at This Height
Ideal weight isn't one-size-fits-all. Muscle mass is the biggest variable—muscle weighs more than fat, so two women at 5'9" with identical BMI may look different. Frame size matters too: smaller-framed women typically sit toward the lower end of the healthy range, while larger-framed women may be healthy at the upper end. Age affects metabolism and muscle distribution. Ethnicity also influences health risk at different weights—the NHS recommends lower BMI thresholds for South Asian, Chinese, Black African, and Black Caribbean women due to higher cardiovascular risk at the same BMI. Your GP or a registered dietitian can assess whether you're at a healthy weight for your individual circumstances.
- 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's the average weight for a 5'9" female in the UK?
According to ONS data, the average UK adult woman weighs approximately 71.6 kg (11 stone 3 lbs), though this varies widely. Average doesn't mean ideal—many women at the UK average weight have overweight or obese BMI classifications. Your personal healthy weight depends on your height, frame size, and muscle mass, not the population average.
Is 70 kg a healthy weight for someone 5'9"?
At 5'9" (175cm), a weight of 70 kg gives a BMI of approximately 22.9, which falls in the healthy weight range according to NHS guidelines. However, individual health depends on many factors. Use our free BMI calculator to find your exact BMI and compare it to NHS healthy weight thresholds for your height.
How do I find my ideal weight if I'm 5'9"?
Calculate your healthy weight range using the formula: BMI 18.5–24.9 × height in metres squared. For 5'9" (1.75m), this gives roughly 55–74 kg. However, the best approach is to use our free healthy weight calculator above or speak with your GP, who can consider your individual health, muscle mass, and medical history.
Should I aim for the lower or upper end of the healthy weight range?
There's no "correct" end of the range—where you fall depends on your frame size, muscle mass, and genetics. A smaller-framed woman might be healthiest at 58 kg, while a larger-framed woman might be healthiest at 72 kg, both within the same healthy BMI range. Your GP can help you identify a realistic, sustainable weight for your body.
Does ethnicity affect ideal weight for 5'9" women?
Yes. The NHS recommends lower BMI thresholds for women of South Asian, Chinese, Black African, and Black Caribbean heritage—a healthy BMI starts at 18.5 but upper limit is 22.9 rather than 24.9. This is because these groups face higher risk of type 2 diabetes and heart disease at the same BMI as other populations. Speak with your GP about appropriate thresholds for your ethnicity.
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.