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's the Average Weight for a 5'9" Female?
The average weight for a 5'9" (175 cm) woman in the UK is approximately 71.6 kg (11 stone 3 lbs). However, average doesn't mean ideal — what matters more is whether your weight falls within a healthy weight range based on your BMI. For a woman of this height, a healthy weight using the NHS BMI framework sits between approximately 55–74 kg (8st 8lb–11st 8lb), depending on your frame size and individual health. The BMI calculator on this page helps you find your personal healthy weight range instantly.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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" — Based on NHS BMI Guidelines
According to NHS guidelines, a healthy BMI sits between 18.5 and 24.9. For a 5'9" (175 cm) woman, this translates to a healthy weight range of approximately 55–74 kg, or 8 stone 8 lbs to 11 stone 8 lbs in UK measurements.
- Lower bound (BMI 18.5): 55 kg / 8st 8lbs — lean, athletic build
- Upper bound (BMI 24.9): 74 kg / 11st 8lbs — healthy upper range
- Overweight range (BMI 25–29.9): 75–88 kg / 11st 9lbs–13st 12lbs
- Obese range (BMI 30+): 89 kg / 14st 0lbs and above
For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends a slightly lower healthy BMI threshold (18.5–22.9), reflecting higher cardiovascular risk at higher BMI levels. Your GP can provide personalised guidance based on your individual health profile.
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.
How to Find Your Ideal Body Weight Using BMI
Your ideal body weight depends on several factors: age, muscle mass, bone density, and overall health — not just height. Use our free BMI calculator above to enter your current weight and height; it will instantly show you where you fall on the NHS BMI scale. If you're aiming for the healthy weight range, aim for a BMI between 18.5 and 24.9. You can also use our free weight converter to switch between kg, stone, and pounds as you track your progress. Remember, sustainable weight loss is typically 0.5–1 kg per week alongside dietary changes and increased physical activity.
- 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.
Is 70 kg heavy for a 5'9" woman?
At 70 kg (11 stone 0 lbs), a 5'9" woman has a BMI of approximately 25.9, which falls into the overweight range (BMI 25–29.9) according to NHS guidelines. A healthy weight for this height is below 74 kg. Small reductions in weight can improve health outcomes — consult your GP for personalised advice.
What's the difference between average and ideal weight?
Average weight is what most people at that height weigh statistically; ideal weight is what health professionals recommend based on BMI, health status, and fitness level. Average doesn't equal healthy — aim for the NHS healthy BMI range (18.5–24.9) rather than matching population average.
How do I convert the healthy weight range to stone and pounds?
55 kg = 8 stone 8 lbs (lower bound), and 74 kg = 11 stone 8 lbs (upper bound). Use our free weight converter on this page to switch between kg and UK measurements instantly for any weight value.
Does my ethnicity affect what's considered a healthy weight?
Yes. For South Asian, Chinese, Black African, and Black Caribbean adults, the NHS recommends a lower healthy BMI threshold (18.5–22.9) rather than 18.5–24.9, because these groups face higher health risks at higher BMI levels. Discuss this with your GP if applicable.
What if I'm struggling to reach a healthy weight?
Start with small, sustainable changes: reduce portions, increase physical activity, and consult your GP. Your doctor can assess you for support including tier 2 NHS weight management programmes or, if appropriate, referral to specialist services. Weight loss of 5–10% of body weight brings real health benefits.
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.