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 Man 5ft 9in — UK Reference Data
For a man who is 5ft 9in (173cm) tall, the ideal weight range according to NHS guidelines is between approximately 55kg and 74kg (8st 8lbs to 11st 9lbs). This healthy weight range is based on a BMI of 18.5 to 24.9, the standard threshold used across the UK. However, ideal weight varies depending on muscle mass, frame size, and individual health factors. The average UK man of this height weighs around 82kg (12st 12lbs), which falls into the overweight category. Use our free BMI calculator above to check your personal BMI and understand where your current weight sits in relation to NHS healthy weight guidance.
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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 and BMI for 5ft 9in Men
According to NHS standards, a healthy weight range for a man 5ft 9in tall is 55–74kg (8st 8lbs to 11st 9lbs). This corresponds to a BMI of 18.5–24.9. Below is the breakdown by weight category:
- Underweight: Below 55kg (8st 8lbs) — BMI below 18.5
- Healthy weight: 55–74kg (8st 8lbs to 11st 9lbs) — BMI 18.5–24.9
- Overweight: 74–88kg (11st 9lbs to 13st 12lbs) — BMI 25–29.9
- Obese (Class I): 88–102kg (13st 12lbs to 16st 1lb) — BMI 30–34.9
These categories are based on standard NHS guidance. You can convert your weight between kg, stone, and pounds using the weight converter on this page. Individual ideal weight also depends on whether you carry significant muscle mass, as muscle is denser than fat and may result in a higher weight at the same body composition.
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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 That Influence Your Ideal Weight
Ideal weight is not one-size-fits-all. Several factors affect what weight is genuinely ideal for you personally:
- Muscle mass: Athletes and people who strength train may weigh more at a healthy body composition because muscle weighs more than fat
- Frame size: Men with larger bone structure naturally weigh more than those with smaller frames, even at the same height
- Age: Muscle naturally decreases with age, so older men may carry slightly less weight while maintaining health
- Ethnicity: The NHS recommends lower BMI thresholds for South Asian, Chinese, Black African, and Black Caribbean men due to higher health risks at lower weights
- Overall health: Some medical conditions affect optimal weight; always discuss with your GP if unsure
Use our healthy weight calculator to explore your ideal range based on your specific 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 the exact ideal weight for a 5ft 9in man?
The healthy weight range is 55–74kg (8st 8lbs to 11st 9lbs) according to NHS guidelines. Within this range, your ideal weight depends on muscle mass, frame size, and personal health factors. The midpoint of this range is approximately 65kg (10st 3lbs).
Is the average UK man weight the same as ideal weight?
No. The average UK man of 5ft 9in weighs around 82kg (12st 12lbs), which is in the overweight category. Ideal weight, based on BMI guidelines, is lower at 55–74kg. Average and ideal are different — ideal is based on health thresholds.
How does BMI relate to ideal weight?
BMI is calculated from weight and height. A healthy BMI for adults is 18.5–24.9. For your height, this produces the 55–74kg range. However, BMI has limitations — it does not account for muscle mass, so athletes may have a higher BMI while being very healthy.
Does my ideal weight change if I'm very muscular?
Yes. If you regularly strength train or have significant muscle mass, your ideal weight may be at the higher end of the range or above it, because muscle is denser than fat. A GP or fitness professional can help assess whether your weight is healthy for your body composition.
What if my ethnicity affects my health risk?
If you are South Asian, Chinese, Black African, or Black Caribbean, the NHS recommends lower BMI thresholds (18.5–22.9 for healthy weight). For 5ft 9in, this would mean a healthy range of approximately 55–65kg. Discuss with your GP if your ethnic background affects your personal health targets.
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.