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
What's a Healthy Weight Range For Your Height and Age?
Your healthy weight depends mainly on your height, not your age. The NHS uses BMI (body mass index) to determine healthy weight ranges, which apply equally to all adults regardless of age. A healthy BMI is between 18.5 and 24.9 for most UK adults. However, age does matter indirectly — older adults may have different health priorities, and certain health conditions become more common with age. This guide explains healthy weight ranges by height using NHS standards, and how to find your personal target using our free BMI calculator and weight converter.
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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 Ranges By Height (NHS Standards)
The healthy weight range for your height is calculated using your height in metres squared. Use our free BMI calculator above to enter your height and see your exact healthy weight range instantly. Here are approximate healthy weights by height for UK adults:
- 5ft 0in (152cm): 45–60kg (7st 1lb – 9st 6lb)
- 5ft 4in (163cm): 51–68kg (8st 0lb – 10st 10lb)
- 5ft 6in (168cm): 55–74kg (8st 9lb – 11st 8lb)
- 5ft 8in (173cm): 59–79kg (9st 4lb – 12st 6lb)
- 5ft 10in (178cm): 63–85kg (9st 13lb – 13st 5lb)
- 6ft 0in (183cm): 68–91kg (10st 11lb – 14st 5lb)
These ranges assume a standard BMI of 18.5–24.9. For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends slightly lower thresholds (BMI 18.5–22.9) due to higher health risk at the same weight.
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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.
Why Age Matters Less Than You'd Think
BMI is age-neutral — a healthy BMI at age 25 is the same as at age 65. However, health priorities do shift with age. Older adults may benefit from maintaining a slightly higher weight for bone health and muscle preservation, though this should be discussed with your GP. Weight management becomes increasingly important as we age because excess weight raises the risk of type 2 diabetes, cardiovascular disease, and joint problems — all more common in older age. Regular physical activity and balanced nutrition matter at every age. Use our weight converter to track your weight in familiar units (stone and pounds), and our progress tracker to log changes over time.
- 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 healthiest weight for a 5ft 6in woman?
For a woman 5ft 6in (168cm) tall, a healthy weight range is approximately 55–74kg (8st 9lb – 11st 8lb), based on an NHS-standard BMI of 18.5–24.9. Your exact ideal weight within this range depends on your muscle mass, frame size, and personal health context. Use our free BMI calculator to find your specific range.
Does healthy weight change with age?
Healthy BMI thresholds don't change with age — a BMI of 18.5–24.9 is healthy at any age. However, older adults sometimes benefit from slightly higher weight for bone and muscle preservation. Your GP can advise on what's right for your individual circumstances, especially if you have specific health conditions.
How do I convert my weight to stone and pounds?
Use our free weight converter on this page to switch between kg, stone, and pounds instantly. Alternatively: multiply kg by 0.157473 to get stone, or multiply kg by 2.20462 to get pounds. For example, 70kg equals 11 stone 0.1lbs.
What if I'm overweight — how do I reach a healthy weight range?
The NHS recommends losing weight gradually at 0.5–1kg per week through a calorie deficit, increased physical activity, and dietary changes. For BMI over 30 or 27 with weight-related health conditions, your GP can discuss weight management options including lifestyle support or prescription treatments like GLP-1 medications. Track your progress using our free progress tracker.
Are healthy weight ranges different for men and women?
No — healthy BMI ranges are the same for men and women at the same height. However, average body composition differs; men typically have more muscle and less fat than women at the same weight. Individual health needs may vary, so discuss your personal healthy weight target with your GP.
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.