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
Age, Height and Weight Chart for UK Adults
A healthy weight depends on your individual age, height, and body composition rather than a single target number. The NHS provides BMI-based guidance to help you understand whether your weight falls within a healthy range for your height. This guide explains how to use weight charts, what healthy weight means in UK context, and how your age and height combine to determine appropriate health targets. Use our free BMI calculator to find your personal healthy weight range instantly.
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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.
Understanding Healthy Weight Ranges by Height
The NHS defines healthy weight using Body Mass Index (BMI), which compares your weight to your height. A healthy BMI is 18.5 to 24.9 for most UK adults. However, the exact weight that produces this BMI varies significantly depending on your height.
- At 160cm (5ft 3in): healthy weight range is approximately 47–64 kg (7st 5lbs to 10st)
- At 170cm (5ft 7in): healthy weight range is approximately 53–72 kg (8st 4lbs to 11st 5lbs)
- At 180cm (5ft 11in): healthy weight range is approximately 60–80 kg (9st 6lbs to 12st 8lbs)
These ranges are for adults aged 18–65. For people of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower thresholds because these groups face higher health risks at lower BMI levels. Use our free weight converter to check your measurements in stone, pounds, and kilograms.
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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.
How Age Affects Healthy Weight and Metabolism
Age influences healthy weight in several ways. Muscle mass naturally decreases from around age 30 onwards, reducing your metabolic rate—the number of calories your body burns at rest. This means you may need to eat slightly less to maintain the same weight as you age. However, BMI categories remain the same across all adult ages—a healthy BMI is 18.5–24.9 whether you are 25 or 65.
The NHS health checks programme recommends all adults aged 40–74 have their weight, height, and health risk assessed. Even modest weight loss of 5–10% of your body weight can significantly improve blood pressure, blood sugar control, and cardiovascular health. Try our free BMI calculator to determine your personal healthy weight range, and track changes with our progress tracker 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 a healthy weight for someone 5ft 5in tall?
For someone 5ft 5in (165cm), the healthy BMI range of 18.5–24.9 corresponds to approximately 50–66 kg (7st 12lbs to 10st 5lbs). However, individual factors like muscle mass, bone density, and ethnicity affect the ideal weight for you personally. Your GP can provide tailored guidance based on your health history.
Does healthy weight change as you get older?
BMI categories remain the same across all adult ages, but your metabolic rate typically decreases after age 30 due to natural muscle loss. This means you may need fewer calories to maintain the same weight. The NHS recommends all adults aged 40–74 have regular weight checks to monitor health risks.
Should I use BMI as my only measure of healthy weight?
BMI is a useful screening tool but has limitations—it does not distinguish between muscle and fat, and does not account for where fat is stored. Waist circumference is also important: for men over 94cm (37in) and women over 80cm (31.5in), health risks increase even at a healthy BMI.
How can I find my healthy weight range?
The easiest way is to use our free BMI calculator on this page, which instantly calculates your healthy weight range based on your height. Alternatively, your GP or a dietitian can discuss your individual healthy weight target, which may vary from the standard NHS range depending on your personal health needs.
Are the healthy weight ranges different for men and women?
No—the BMI categories are the same for men and women. However, body composition differs: women typically have a higher body fat percentage at the same BMI than men. For people of South Asian or Black African heritage, the NHS recommends lower BMI thresholds due to higher health risks at lower weights.
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.