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 — Your NHS Health Guide
A weight chart is a simple tool that shows healthy weight ranges based on your height, helping you understand if your weight falls within a safe zone for good health. In the UK, weight charts are based on BMI (body mass index) and NHS guidelines, which define healthy weight differently depending on your age, ethnicity, and individual health circumstances. Whether you're tracking your weight management or trying to understand what a healthy weight means for you personally, this guide explains how UK weight charts work and how to use them effectively with our free BMI calculator and weight converter.
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.
How UK Weight Charts Work — NHS Guidelines
UK weight charts are based on BMI (body mass index), which divides weight in kilograms by height in metres squared. The NHS uses these standard BMI categories for adults:
- 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 and above
For adults 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. Healthy weight for these populations starts at BMI 18.5–22.9 instead of 24.9. Use our free BMI calculator above to find your personal BMI instantly and see which category you fall into.
Clinically BackedWeight Loss
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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.
Understanding Your Healthy Weight Range
Your healthy weight range depends on your height, age, and individual health. For example, an adult who is 5ft 8in (173cm) tall has a healthy weight range of approximately 55–74kg (8st 10lbs–11st 9lbs). However, BMI has limitations — it doesn't account for muscle mass, where fat is stored, or your individual health circumstances. Our weight converter tool lets you instantly switch between kilograms, stone, and pounds to see what different weights mean in your preferred UK measurements. If you're concerned about your weight or have weight-related health conditions, speak to your GP, who can provide personalised guidance based on your complete health picture and help you set realistic weight management 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 weight should I be according to a UK weight chart?
Your healthy weight depends on your height, age, and ethnicity. Use the NHS BMI categories: healthy weight is BMI 18.5–24.9 (or 18.5–22.9 for South Asian, Chinese, Black African, or Black Caribbean adults). For example, at 5ft 8in, healthy weight is roughly 55–74kg. Our BMI calculator shows your personal range instantly.
How do I read a UK weight chart?
Find your height on the left side of the chart and your weight on the bottom. Where they meet shows your BMI category. UK weight charts typically display ranges in both stone and kilograms. If your point falls in the healthy weight zone, your weight is within NHS guidelines for your height.
Are UK weight charts the same as international charts?
UK weight charts use the same BMI formula as international charts, but the NHS applies ethnicity-adjusted thresholds for certain populations and uses UK measurements (stone and pounds). This means a BMI of 27.5 may be considered overweight for South Asian adults but overweight-to-obese for European ancestry adults.
What's the difference between BMI and a weight chart?
A BMI calculator gives you a single number showing your weight-to-height ratio. A weight chart is a visual representation showing healthy weight ranges for each height. Both use the same calculation, but charts make it easier to see ranges visually. Our free BMI calculator and weight converter provide both approaches.
Should I use a weight chart to lose weight?
Weight charts help you understand if your weight is in a healthy range, but they're just one tool. For weight management, focus on sustainable changes: balanced diet, regular activity, and support from your GP. If you're interested in prescription weight loss support, your GP or a specialist can assess your individual 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.