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
Weight Chart UK — Find Your Healthy Weight Range
A weight chart helps you understand where your current weight falls within NHS health categories and what a healthy weight range looks like for your height. Whether you're tracking your weight management progress or simply curious about health benchmarks, having a clear reference guide makes it easier to set realistic health goals. Our free BMI calculator and weight converter above can help you find your exact position on the chart and convert between stone, pounds, and kilograms instantly.
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.
NHS Weight Categories & What They Mean
The NHS uses standardised BMI (Body Mass Index) categories to classify weight ranges for adults. These categories apply to most UK adults aged 18–65:
- Underweight: BMI below 18.5
- Healthy weight: BMI 18.5–24.9 — the target range recommended by the NHS
- 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 and above
For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower thresholds — healthy weight is BMI 18.5–22.9, as these populations face higher health risks at lower BMI levels. Your GP can provide personalised guidance based on your individual health profile.
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
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 Health
To use a weight chart effectively, locate your height on the left side and find your current weight across the top — where they meet tells you your weight category. However, weight alone doesn't tell the whole story. BMI has limitations: it doesn't distinguish between muscle and fat, and it doesn't account for where fat is stored (waist circumference matters too). A healthy weight range also depends on age, frame size, and individual health conditions.
Use our free weight converter above to switch between kg, stone, and pounds. If you're tracking weight loss, our progress tracker can log your journey over time and help you stay motivated toward realistic goals. Your GP remains your best resource for personalised weight and health advice.
- 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 for someone 5ft 8in tall?
For someone 5ft 8in (173cm), the healthy BMI range of 18.5–24.9 corresponds to approximately 55–74kg (8st 10lbs–11st 10lbs). Use our free BMI calculator above to check your exact healthy range based on your height and see where you currently sit on the weight chart.
Why do South Asian and Black African adults have different weight categories?
Research shows these populations have higher cardiovascular and diabetes risk at lower BMI levels. The NHS recommends they aim for BMI 18.5–22.9 (healthy) rather than 18.5–24.9, because excess weight affects their health earlier. Your GP can explain if adjusted thresholds apply to you.
Does a weight chart work the same for older adults and children?
No. Weight charts for children use age and sex-specific centile charts — adult categories don't apply. For older adults, muscle loss with age affects accuracy. Your GP or NHS health visitor can provide age-appropriate guidance. Always consult a healthcare professional about children's weight.
What if my weight is in the healthy range but I still feel unhealthy?
Weight is just one health marker. Other factors include waist circumference, blood pressure, blood sugar, fitness level, and how you feel. A healthy weight range is important, but overall health is more complex. Speak to your GP about your individual health profile and any concerns.
Can I convert my weight to stone using the weight chart?
Yes — the weight converter tool on this page instantly converts between kg, stone, and pounds. Alternatively, divide kg by 6.35 to get stone, or multiply kg by 2.20 to get pounds. Our free weight converter makes this instant and exact.
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.