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 Weight Chart — Find Your Healthy Range
An age, height, and weight chart helps you understand what constitutes a healthy weight for your individual measurements. While age itself isn't a direct factor in BMI calculations, your height and current weight are crucial. In the UK, the NHS uses BMI (body mass index) as the primary screening tool for healthy weight ranges. This guide explains how these measurements work together, provides context for UK health guidance, and shows you how to use these tools to assess your personal weight status.
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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.
Height, Weight, and Healthy Weight Ranges
Healthy weight ranges are determined by height, not age. The NHS defines a healthy BMI as 18.5 to 24.9 for most UK adults. To find your healthy weight range, you need to know your exact height. For example, at 5ft 8in (173cm), a healthy weight range is approximately 8st 7lbs to 11st 7lbs (55kg to 74kg). At 5ft 5in (165cm), the healthy range is roughly 7st 10lbs to 10st 4lbs (50kg to 65kg).
For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower BMI thresholds: 18.5 to 22.9 is considered healthy, as these groups face higher health risks at higher BMI levels. Use our free weight converter to calculate your exact weight in different units, and our BMI calculator above to find your personal healthy weight range instantly.
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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 Isn't a Direct Factor in Weight Charts
Age doesn't directly affect BMI calculations or healthy weight ranges — BMI is calculated solely from height and weight. However, age does matter in other ways. As we age, our metabolism naturally slows, we may lose muscle mass, and our activity levels often decrease. This means older adults may need to be more intentional about maintaining a healthy weight than younger people. Additionally, children and teenagers should never use adult BMI charts — the NHS uses age and sex-specific growth reference centile charts for anyone under 18. If you're assessing a young person's weight, always consult the NHS Healthy Weight Calculator for children.
- 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 healthy weight for someone 5ft 6in tall?
At 5ft 6in (168cm), a healthy BMI range is 18.5 to 24.9, which corresponds to approximately 7st 9lbs to 10st 3lbs (49kg to 65kg). Use our BMI calculator above to enter your exact height and get your personal healthy weight range instantly.
Does age affect what weight is healthy for me?
Age doesn't directly change BMI calculations, but it does affect metabolism and muscle mass. Older adults may need to be more active to maintain healthy weight. Always consult your GP for personalised advice about your weight in the context of your overall health.
Are there different healthy weight ranges for men and women?
BMI charts use the same ranges for men and women. However, body composition differs — men typically have more muscle mass and less body fat at the same BMI. Our weight converter and BMI calculator both work for all adults regardless of sex.
What if I'm overweight or obese according to a weight chart?
If your weight falls outside the healthy range, your GP can offer support. The NHS offers free weight management programmes, and depending on your BMI and health conditions, you may be eligible for additional support. Weight management often combines dietary changes, physical activity, and sometimes medical support.
Can I use an age height weight chart to assess my child's weight?
No — children need age and sex-specific growth charts, not adult BMI categories. The NHS Healthy Weight Calculator has a children's version. Always speak to your GP or health visitor if you have concerns about a child's weight.
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.