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
At 5'9" How Much Should I Weigh — NHS Healthy Weight Guide
At 5'9" (175cm), the healthy weight range for an adult according to NHS guidelines is approximately 55 to 74 kilograms, or 8 stone 8 pounds to 11 stone 8 pounds. However, your ideal weight depends on your individual frame size, muscle mass, and overall health — not just height. The best way to find out whether your weight is healthy for you is to calculate your BMI and discuss the results with your GP. Our free BMI calculator above can instantly show you where you fall on the NHS healthy weight scale and help you understand what it means for your personal health.
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.
Using the BMI Calculator to Find Your Healthy Weight Range
The BMI (Body Mass Index) calculator is the most reliable tool for determining whether your weight is healthy for your height. It uses a simple formula: your weight in kilograms divided by your height in metres squared. For someone 5'9" tall, you can use our free BMI calculator on this page to instantly see where your current weight sits on the NHS scale.
A healthy BMI is 18.5 to 24.9. At 5'9", this corresponds to approximately 55–74kg. If your BMI falls within this range, your weight is considered healthy by NHS standards. The calculator also shows you:
- Your personal BMI number
- Which category you fall into (healthy, overweight, or obese)
- Your approximate healthy weight range for your height
- How much weight you'd need to lose or gain to reach the healthy range (if applicable)
Remember that BMI doesn't account for muscle mass — athletes may have a higher BMI but be perfectly healthy. Your GP can provide personalised advice about what your BMI means for you specifically.
Clinically BackedWeight Loss
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.
What to Do if Your Weight is Above the Healthy Range
If the BMI calculator shows your weight is above the healthy range, the good news is that even modest weight loss can improve your health. The NHS recommends losing weight gradually at a rate of 0.5 to 1kg per week — this is sustainable and helps preserve muscle. Start with small, practical changes: reduce portion sizes, swap sugary drinks for water, increase physical activity gradually, and eat more vegetables.
If you're struggling to lose weight alone, your GP can help. They may refer you to a free NHS weight management programme, discuss prescription options if appropriate, or recommend speaking with a dietitian. You can also track your progress using our free progress tracker as you work towards your healthy weight range.
- 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.
Is 5'9" considered tall for a man or woman?
At 5'9" (175cm), you're slightly above average height in the UK. The average UK man is about 5'9", and the average UK woman is about 5'3.5". Height doesn't determine healthy weight — what matters is finding the weight that gives you a healthy BMI for your specific height, which the calculator shows instantly.
How do I know if I'm overweight or obese at 5'9"?
Use the BMI calculator above. If your BMI is 25–29.9, you're in the overweight category. If it's 30 or above, you're in the obese category by NHS standards. However, BMI is just one indicator — your GP can assess your overall health and discuss what's right for you individually.
What's the difference between healthy weight and ideal weight?
Healthy weight is any weight that gives you a BMI of 18.5–24.9, which is a range, not a single number. Ideal weight is more personal — it depends on your frame size, muscle mass, age, and health conditions. The healthy range (55–74kg at 5'9") is a good target. Your GP can help you set a realistic personal goal.
Can I lose weight too quickly at 5'9"?
Losing more than 1–1.5kg per week isn't recommended without medical supervision, as it increases the risk of losing muscle, nutrient deficiencies, and gallstones. Gradual, steady weight loss (0.5–1kg per week) alongside physical activity helps preserve muscle and is more sustainable long-term.
Should I use the BMI calculator if I have lots of muscle?
If you have significant muscle mass (e.g., you're a regular gym-goer or athlete), BMI alone may overestimate your health risk. A BMI in the overweight range with low body fat can be healthy. Your GP or a qualified health professional can assess your overall health beyond BMI, including waist measurement and fitness levels.
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.