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
UK Weight Chart — Find Your Healthy Weight Range
A UK weight chart helps you understand what constitutes a healthy weight for your height and age. In the UK, we use stone and pounds alongside kilograms, making it essential to have a reference guide tailored to British measurements. The NHS provides clear guidance on healthy weight ranges based on BMI (Body Mass Index), ethnicity, and individual health factors. This health guide explains how to use a weight chart, interpret the results, and take meaningful action towards better health outcomes.
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.
Understanding UK Weight Charts and BMI Categories
A UK weight chart displays the relationship between height and weight, helping you see where your current weight falls on the NHS health spectrum. The NHS BMI categories for UK adults are:
- Underweight: BMI below 18.5
- Healthy weight: BMI 18.5–24.9
- Overweight: BMI 25.0–29.9
- Obese (Class I): BMI 30.0–34.9
- Obese (Class II): BMI 35.0–39.9
- Severely obese (Class III): BMI 40.0+
However, BMI has limitations — it does not account for muscle mass, bone density, or where fat is stored. For people of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower BMI thresholds because these groups face higher health risks at lower BMI levels. Always use our free BMI calculator above to determine your personal BMI instantly, then cross-reference it with a weight chart for UK health guidance.
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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 to Use a Weight Chart for Your Height
To use a weight chart effectively, find your height in centimetres or feet and inches on the left axis, then locate your current weight in kilograms or stone on the horizontal axis. Where they intersect shows your BMI category. For example, at 1.70m (5ft 7in), a healthy weight range is approximately 53–72 kg (8st 5lbs–11st 5lbs). Use our weight converter to switch between metric and imperial measurements if needed. Remember that healthy weight varies by individual — factors like muscle mass, age, metabolic rate, and medical conditions all influence what is healthy for you. Your GP can provide personalised weight management and UK health advice tailored to your specific circumstances and health goals.
- 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 considered a healthy weight in the UK?
According to NHS guidelines, a healthy weight is one that gives you a BMI between 18.5 and 24.9. However, healthy weight varies by individual based on height, age, muscle mass, and medical history. Use the BMI calculator on this page to find your personal range, then consult your GP for personalised health advice.
How do I read a UK weight chart?
Find your height on the vertical axis and your weight on the horizontal axis. Where they meet shows your BMI category. UK charts typically use both stone and kilograms. Remember that BMI does not account for muscle mass, so it is a screening tool, not a definitive health measure.
Are BMI thresholds different for different ethnicities?
Yes. The NHS recommends lower BMI thresholds for people of South Asian, Chinese, Black African, and Black Caribbean backgrounds — healthy weight starts at BMI 18.5–22.9 instead of 18.5–24.9. This is because these groups have higher cardiovascular and diabetes risk at lower BMI levels.
What should I do if my weight falls outside the healthy range?
If your weight is above the healthy range, focus on sustainable lifestyle changes: calorie deficit of around 500 kcal daily (approximately 0.5 kg weight loss per week), increased physical activity, and balanced nutrition. The NHS recommends starting with tier 1 support — digital tools, community programmes, or speaking to your GP about weight management options.
Can I lose weight safely using my weight chart as a guide?
Yes. Track your progress regularly using your weight chart and our free progress tracker. Safe weight loss is approximately 0.5–1 kg per week. If you have health conditions or are considering prescription weight loss options, consult your GP. They can assess your individual situation and recommend appropriate UK health guidance tailored to your needs.
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.