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 5'9"
For a man who is 5'9" (175 cm), the ideal body weight according to NHS guidelines falls between approximately 58 kg (9st 2lbs) and 77 kg (12st 2lbs). This range represents a healthy BMI of 18.5 to 24.9. However, ideal weight varies significantly based on muscle mass, frame size, age, and overall health. The average UK man of this height weighs around 84 kg (13st 3lbs), which sits in the overweight category. Use our free BMI calculator above to check your personal health range and see where your current weight fits.
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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.
Ideal And Healthy Weight Ranges For 5'9"
NHS healthy weight range (BMI 18.5–24.9): 58–77 kg (9st 2lbs to 12st 2lbs)
These figures are based on NHS BMI guidelines and apply to most adult men. Within this range, you can use our healthy weight calculator to find where you sit.
- Lower end (BMI 18.5): 58 kg (9st 2lbs) — athletic or lean build
- Mid-range (BMI 21): 66 kg (10st 5lbs) — typical healthy weight
- Upper end (BMI 24.9): 77 kg (12st 2lbs) — healthy but approaching overweight threshold
For comparison, the average UK weight for height shows that most men of 5'9" currently weigh more than the healthy range. These figures are calculated using the standard healthy weight formula: BMI = weight (kg) ÷ height (m)². Our weight converter can help you switch between kg, stone, and pounds instantly if you need to check other weights for this 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.
Factors That Affect Your Ideal Weight
Ideal weight is not one-size-fits-all. Muscle mass has the biggest impact — muscular men can weigh more than the BMI range suggests while remaining very healthy, because muscle is denser than fat. Frame size also matters: a man with a large frame may naturally sit at the higher end of the healthy range, whilst someone with a smaller frame may be healthier at the lower end. Age affects body composition too — older men tend to lose muscle mass naturally. Ethnicity can influence health thresholds; the NHS recommends slightly lower BMI targets for men of South Asian, Chinese, Black African, or Black Caribbean heritage due to increased metabolic risk. Rather than chasing a single "ideal" number, focus on staying within the healthy BMI range and maintaining fitness.
- 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 "healthy weight"?
Ideal weight is a target based on your height, age, and frame size — it's an estimate. Healthy weight refers to any weight within the NHS BMI range (18.5–24.9) that supports good health outcomes. For a 5'9" man, any weight between 58–77 kg is considered healthy, but your personal ideal within that range depends on your muscle mass and build.
Is 70 kg a good weight for a 5'9" man?
Yes, 70 kg (11st 0lbs) is well within the healthy weight range for a man 5'9" tall. This gives a BMI of approximately 21.5, which sits comfortably in the middle of the healthy range. However, whether it's ideal for you depends on your muscle mass, frame size, and overall health goals.
How do I know if I'm at my ideal weight?
Use our free BMI calculator above to check your BMI first. A BMI between 18.5 and 24.9 is healthy. Beyond BMI, consider your waist circumference (under 94 cm is ideal for men), how you feel physically, your energy levels, and any health conditions. Your GP can provide personalised advice about your ideal weight based on your individual health profile.
Why does the average UK man weigh more than the healthy range?
The average UK man aged 16–65 weighs approximately 84 kg (13st 3lbs), which is above the healthy range for most heights. This reflects rising rates of overweight and obesity in the UK population. Around 63% of UK adults are overweight or obese. Many factors contribute, including sedentary lifestyles, dietary patterns, and genetic predisposition.
Does ideal weight change as you get older?
Yes, slightly. As men age, they naturally lose muscle mass and may need to adjust their ideal weight target downwards to maintain the same body composition. A 60-year-old and a 30-year-old of the same height might have slightly different ideal weights. Regular strength training and physical activity help maintain muscle mass and support a healthy weight as you age. Talk to your GP about age-specific 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.