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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What Is a Healthy Weight for 5ft 9in?
At 5ft 9in (173cm), you're close to the average height for UK adult men. Your healthy weight range according to NHS guidelines is between 55.4 kg and 74.5 kg (8 stone 10 lbs to 11 stone 10 lbs). This gives you a BMI between 18.5 and 24.9, which is considered a healthy weight. However, healthy weight varies depending on muscle mass, body composition, and overall fitness. Use our free BMI calculator above to check your personal BMI and get tailored health guidance for your specific measurements.
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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.
BMI Categories at 5ft 9in Height
For someone who is 5ft 9in tall, here's how different weights translate to BMI categories according to NHS guidance:
- Underweight (BMI below 18.5): Below 55.4 kg (8st 10lbs)
- Healthy weight (BMI 18.5–24.9): 55.4 kg to 74.5 kg (8st 10lbs to 11st 10lbs)
- Overweight (BMI 25.0–29.9): 74.5 kg to 89.8 kg (11st 10lbs to 14st 2lbs)
- Obese Class I (BMI 30.0–34.9): 89.8 kg to 104.7 kg (14st 2lbs to 16st 6lbs)
- Obese Class II (BMI 35.0–39.9): 104.7 kg to 119.6 kg (16st 6lbs to 18st 11lbs)
- Severely obese (BMI 40+): 119.6 kg or above (18st 11lbs or above)
BMI is a useful screening tool, but remember it doesn't account for muscle mass or where fat is stored. Our free weight converter and BMI calculator above can help you check your exact position within these ranges.
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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.
Context for Your Height at 5ft 9in
At 5ft 9in, you're slightly taller than the UK average for adult men (175.3cm). This means your healthy weight range sits in the mid-range for UK adults. If you're concerned about your weight or have weight-related health conditions like type 2 diabetes, high blood pressure, or sleep apnoea, your GP can help assess whether weight management support is appropriate. For some people, prescription options like GLP-1 weight loss medications (Mounjaro or Wegovy) may be considered as part of a comprehensive approach alongside diet and physical activity. Your GP can also refer you to NHS specialist weight management services if needed. Remember, healthy weight is individual and depends on many factors including age, sex, muscle mass, and medical history.
- 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 5ft 9in in centimetres?
5ft 9in equals 173 centimetres. This is a straightforward conversion: 5 feet equals 152.4cm, plus 9 inches (22.9cm) equals 173cm total. You can use our weight converter above to switch between different height and weight measurements.
What weight range is healthy for someone 5ft 9in tall?
According to NHS guidance, a healthy BMI for your height is 18.5 to 24.9, which corresponds to approximately 55.4 kg to 74.5 kg (8 stone 10 lbs to 11 stone 10 lbs). Our free BMI calculator above can help you determine where your current weight falls within these ranges.
Is 5ft 9in a good height?
5ft 9in is very close to the average height for UK adult men (175.3cm), so it's entirely within the typical range. Height itself doesn't determine health — what matters more is having a healthy weight for your height, regular physical activity, and managing any health conditions. Your GP can provide personalised guidance on health for your height and build.
What would my BMI be at 5ft 9in if I weigh 90kg?
At 5ft 9in and 90kg, your BMI would be approximately 33.2, which falls into the Obese Class I category. This is above the healthy weight range of 55.4–74.5 kg. If you're concerned about your weight and health, your GP can discuss options including lifestyle changes and, where appropriate, weight management support or referral to specialist services.
Can GLP-1 weight loss injections help at my height?
GLP-1 medications like Wegovy or Mounjaro may be considered for adults with a BMI of 30 or above, or 27+ with weight-related health conditions. These are prescription-only and require clinical assessment from a GP or prescriber. Try our free GLP-1 weight loss calculator above to explore potential outcomes — individual results vary significantly and depend on dose, diet, and lifestyle changes.
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.