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's the Ideal Weight for a 5'9" Male in Kg?
For an adult male of 5'9" (175 cm), the NHS-recommended healthy weight range is approximately 59–79 kg (9 stone 4 lbs to 12 stone 6 lbs). However, ideal weight depends on individual factors including muscle mass, frame size, and overall health. According to UK data, the average weight for a man of this height is around 82–85 kg, which sits in the overweight category by BMI. Your GP can provide personalised guidance based on your health profile.
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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 NHS Guidelines
For a male aged 5'9" (175 cm), the healthy weight range according to NHS guidelines is 59–79 kg (9 stone 4 lbs to 12 stone 6 lbs). This range is based on a healthy BMI of 18.5 to 24.9, which is the standard for most UK adults.
The upper and lower bounds of this ideal weight range are calculated as follows:
- Lower healthy weight: 18.5 × (1.75)² = 56.6 kg (8 stone 12.8 lbs)
- Upper healthy weight: 24.9 × (1.75)² = 76.1 kg (11 stone 12.8 lbs)
You can use our free BMI calculator to find your personal BMI instantly and see where your current weight sits relative to the healthy range. If you're significantly above or below this range, your GP can advise on next steps and whether weight management support would be beneficial for your health.
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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.
Factors That Affect Your Ideal Weight
Ideal weight is not one-size-fits-all. Several factors influence what a healthy weight means for you personally:
- Muscle mass: Muscular individuals may weigh more but have lower body fat — BMI alone doesn't distinguish between muscle and fat
- Frame size: Larger-framed men may sit naturally higher within the healthy range
- Age: Muscle naturally decreases with age; weight distribution changes over time
- Ethnicity: Men of South Asian, Chinese, or Black African heritage may have higher health risks at the same BMI, so lower thresholds apply
- Overall fitness: Cardiovascular fitness and strength matter as much as the number on the scales
Use our free healthy weight calculator alongside the BMI calculator above to understand your personal healthy weight range in context.
- 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 difference between ideal weight and average weight?
Ideal weight (or healthy weight range) is the range where health risks from excess weight are minimised, based on BMI guidelines. Average weight is simply what most people of that height actually weigh — which in the UK is often higher than the healthy range. For a 5'9" male, the healthy range is 59–79 kg, but the average is around 82–85 kg.
How do I know if I'm at a healthy weight for my height?
The best starting point is calculating your BMI using your weight in kg and height in metres. A BMI of 18.5–24.9 is considered healthy by NHS standards. Our free BMI calculator on this page will show you instantly where you fall. For personalised advice tailored to your health profile, speak to your GP.
Is 80 kg a healthy weight for a 5'9" male?
At 80 kg, a 5'9" male has a BMI of approximately 26.2, which falls into the overweight category (25–29.9). This is just above the healthy range of 59–79 kg. While not obese, this weight does increase health risks. Your GP can discuss whether weight management would be beneficial for you.
What if I'm very muscular — does BMI still apply?
BMI is useful but has limitations. If you have significant muscle mass, your BMI may appear higher even though your body fat is healthy. Waist circumference and how you feel physically matter too. For a more detailed assessment, discuss your body composition with your GP or a fitness professional.
Can I use a healthy weight calculator to find my ideal weight?
Yes — several formulas exist (Devine, Robinson, Hamwi), but they're approximations. The NHS BMI range is the most reliable starting point. Our free healthy weight calculator and BMI calculator on this page will help you identify your personal healthy range based on current NHS guidelines.
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.