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
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Weight Measurement Chart — UK Health Guide
A weight measurement chart helps you understand where your current weight sits within NHS healthy weight ranges and what this means for your health. In the UK, we use stone, pounds, and kilograms to measure body weight, and the NHS provides clear guidance on what constitutes a healthy weight for different heights. This guide explains UK weight measurement standards, how to use a weight chart effectively, and where to find reliable health information and tools to track your weight management journey.
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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 Measurement Standards
The NHS uses kilograms (kg) as the standard measurement for clinical health assessments, but most UK adults prefer stone and pounds for everyday weight tracking. One stone equals exactly 14 pounds, or approximately 6.35 kg. Understanding how to convert between these measurements is essential for interpreting health guidance and comparing your weight to NHS standards.
- Kilograms (kg): Used by NHS, most health professionals, and clinical guidelines
- Stone and pounds: Preferred by UK adults; 1 stone = 14 lbs exactly
- Pounds (lbs): Used in some diet programmes and fitness tracking
Use our free weight converter above to switch between these measurements instantly. NHS weight guidance is based on BMI (body mass index), which combines your weight with your height. For most UK adults, a healthy BMI sits between 18.5 and 24.9. However, for people of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower BMI thresholds starting at 18.5 to 22.9, as these groups face higher health risks at standard BMI levels.
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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.
Using a Weight Chart for Healthy Weight Management
A weight measurement chart shows you where your current weight falls across the NHS healthy weight categories. Rather than aiming for a specific number, focus on the healthy weight range for your height, which typically spans 8–10 kg. You can find your personal healthy weight range using our free BMI calculator above, which instantly shows whether your weight falls in the healthy, overweight, or obese range according to NHS guidelines.
Safe, sustainable weight loss is typically 0.5 to 1 kg per week. If you're concerned about your weight or seeking guidance on weight management, your GP can provide personalised advice and may refer you to NHS weight management services. Regular weight tracking using our free progress tracker can help you monitor changes over time and stay motivated on your health journey.
- 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 healthy weight range according to the NHS?
The NHS considers a healthy BMI to be between 18.5 and 24.9 kg/m². For a person 5ft 8in (1.73m) tall, this equates to approximately 55–74 kg (8st 10lbs to 11st 10lbs). However, healthy weight varies by height, age, and individual health factors, so your GP can advise your personal healthy range.
How do I convert my weight between stone and kilograms?
One stone equals 6.35 kg exactly. To convert stone to kg, multiply by 6.35. To convert kg to stone, divide by 6.35. Our free weight converter above does this instantly—just enter your weight in one unit and it automatically calculates the other.
Why does the NHS use different weight thresholds for certain ethnic groups?
Research shows that people of South Asian, Chinese, Black African, and Black Caribbean heritage have a higher risk of type 2 diabetes and cardiovascular disease at lower BMI levels than other populations. The NHS therefore recommends lower BMI thresholds (18.5–22.9 healthy range) for these groups to better identify health risks earlier.
What's the difference between BMI and actual body weight on a chart?
A weight measurement chart shows absolute weight in kg or stone. BMI combines weight with height to give a health indicator. Two people weighing the same may have very different BMIs depending on their height, and BMI doesn't account for muscle mass, so it's one tool among several for assessing health.
How often should I check my weight when using a measurement chart?
The NHS recommends weighing yourself once weekly at the same time of day, ideally in the morning before eating. Weight naturally fluctuates daily due to hydration and food intake. Track your progress over weeks and months rather than focusing on daily changes. Our free progress tracker can help you log and visualise these trends over time.
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.