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 Man 5'9"?
The ideal weight for a man 5'9" (175cm) is between 55.4kg and 74.5kg (8st 10lbs to 11st 10lbs), based on the NHS healthy BMI range of 18.5–24.9. This is the weight range where most men of this height have the lowest health risk. However, ideal body weight varies based on muscle mass, frame size, and individual health factors, so your GP can advise whether you're in a healthy range for your circumstances.
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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 at BMI 18.5–24.9
For a man who is 5'9" (175cm tall), the healthy weight range according to NHS guidelines is 55.4kg to 74.5kg, which converts to 8st 10lbs to 11st 10lbs in UK measurements. This range corresponds to a BMI of 18.5–24.9, the NHS threshold for a healthy weight.
A BMI below 18.5 suggests underweight status, while 25.0–29.9 indicates overweight, and 30.0 and above indicates obesity. At 5'9", the average UK weight for men is approximately 85.7kg (13st 7lbs), which falls into the overweight BMI category. The healthy weight range accounts for natural variation in bone density, muscle composition, and frame size—not everyone at 5'9" needs to reach the lower end of this range to be healthy.
Use our free BMI calculator above to check your personal BMI instantly and see how your current weight compares to the healthy range for your height.
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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.
Using the BMI Calculator for Your Height
The most accurate way to determine whether your weight is ideal for your height is to calculate your personal BMI. Our free healthy weight calculator on this page does this instantly—simply enter your height and weight, and you'll see exactly where you fall on the NHS BMI scale. This removes guesswork and gives you a clear picture of your health status based on medical guidelines.
If your BMI falls outside the healthy range, even small changes can make a difference. A reduction of just 5–10% of your body weight can improve blood pressure, blood sugar control, and overall health. If you're concerned about your weight for height, discuss personalised advice with your GP, who can consider your individual health context, family history, and any weight-related health conditions.
- 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 ideal weight for a 5'9" man in stone?
The healthy weight range for a man 5'9" is 8st 10lbs to 11st 10lbs (55.4kg to 74.5kg). This is based on the NHS BMI range of 18.5–24.9. Ideal weight varies with muscle mass and frame size, so this is a guideline range rather than a fixed target.
What BMI should a man 5'9" aim for?
A BMI of 18.5–24.9 is considered healthy by the NHS. At 5'9", this translates to 55.4–74.5kg. Your exact target within this range depends on your muscle mass, bone density, and individual health factors—discuss with your GP if you're unsure.
Is 85kg overweight for a man 5'9"?
Yes. At 5'9" and 85kg, your BMI is approximately 25.6, which falls into the overweight category (BMI 25–29.9). The NHS healthy range ends at 74.5kg for this height, so a reduction of around 10kg would bring you into the healthy BMI band.
How do I calculate my ideal weight for my height?
Use the free BMI calculator on this page—enter your height and weight to see your BMI instantly. The healthy weight range formula is: lower bound = 18.5 × height(m)², upper bound = 24.9 × height(m)². Alternatively, speak to your GP for personalised guidance.
Does ideal weight change with age or muscle mass?
BMI does not distinguish between muscle and fat, so a muscular man may have a higher BMI without excess body fat. Age can affect muscle mass and metabolism. Your GP or a healthcare professional can assess whether you're at a healthy weight for your individual circumstances beyond BMI alone.
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.