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 a Healthy Weight at 5ft 9?
If you're 5ft 9 (175 centimetres), your healthy weight according to NHS guidelines depends on your overall health, muscle mass, and individual circumstances. At this height, a BMI of 18.5 to 24.9 is considered healthy, which means your weight should ideally fall between approximately 55.4 kg (8st 10lbs) and 74.5 kg (11st 10lbs). However, BMI is just one indicator of health — your GP can provide personalised guidance based on your complete health picture, including waist measurement and any weight-related health conditions you may have.
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 and BMI for Your Height
At 5ft 9 (1.73 metres), the NHS healthy weight range is approximately 55–75 kg (8st 8lbs to 11st 11lbs). This is calculated using the BMI formula: weight (kg) ÷ height (m)², with a healthy BMI range of 18.5 to 24.9.
Your exact healthy weight depends on several factors:
- Muscle mass: Muscle weighs more than fat, so athletes or very active individuals may have a higher healthy weight at the same height
- Bone structure: Frame size affects ideal weight — some people naturally have larger frames
- Age and metabolism: Metabolic rate changes with age, affecting healthy weight ranges
- Ethnicity: For people of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends slightly lower BMI thresholds due to higher health risks at lower weights
Use our free BMI calculator above to find your personal BMI and see where you fall within the healthy range. The weight converter on this page also helps you switch between metric and imperial measurements easily.
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.
UK Health Context and Next Steps
At 5ft 9, your weight is just one part of your overall health picture. The NHS also recommends checking your waist circumference — for men, under 94 cm (37 inches) is ideal; for women, under 80 cm (31.5 inches). If you're concerned about your weight or have weight-related health conditions such as type 2 diabetes, high blood pressure, or sleep apnoea, your GP can assess your individual situation and discuss options including lifestyle changes, structured weight management programmes, or — if appropriate — prescription weight loss support. Speak to your GP for personalised health advice tailored to your 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 is 5ft 9 in centimetres?
5ft 9 equals 175 centimetres (or 1.75 metres). This is slightly taller than the average UK adult male height of 175.3 cm. Use the height converter on this page to switch between feet and inches and metric measurements instantly.
What BMI should I aim for at 5ft 9?
According to NHS guidelines, a healthy BMI at 5ft 9 is between 18.5 and 24.9. This corresponds to a weight range of approximately 55–75 kg. If you're of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends aiming for a BMI of 18.5 to 22.9 for better health outcomes.
Is 80 kg overweight at 5ft 9?
At 5ft 9 (1.73m), 80 kg gives a BMI of approximately 26.7, which falls in the overweight category according to NHS guidelines. However, BMI doesn't account for muscle mass. Your GP can assess your overall health, including waist circumference and any weight-related conditions.
What's the average weight for someone 5ft 9?
The average UK adult male is approximately 175 cm tall and weighs around 85.7 kg (13st 7lbs), giving an average BMI of about 27.9. However, average does not mean healthy — NHS guidance recommends aiming for a BMI within the 18.5–24.9 range for better long-term health outcomes.
Should I see my GP about my weight at 5ft 9?
Yes, if you're concerned about your weight, have weight-related health conditions, or want personalised guidance, speak to your GP. They can assess your individual health, discuss safe weight loss options, and refer you to NHS weight management services if appropriate. Never attempt very gradual weight management without medical supervision.
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.