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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BMI Graph in Kg — NHS Categories Explained
A BMI graph in kg shows you visually where your weight falls on the NHS health scale. Whether you're looking at your own weight or understanding the bmi range uk adults should aim for, this guide breaks down the categories clearly. BMI (body mass index) is calculated using your weight in kilograms and height in metres — it's the standard measurement used by the NHS to screen for healthy weight. Understanding your position on the graph helps you see whether lifestyle changes, or professional support, might be helpful for your health.
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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.
NHS BMI Categories and Weight Ranges in Kg
The NHS BMI scale divides adults into four main categories based on their weight in kg and height. Here's how the bmi formula works: divide your weight (kg) by your height in metres squared. The resulting number places you in one of these categories:
- Underweight: BMI below 18.5 (typically under 55kg for a 5ft 8in adult)
- Healthy weight: BMI 18.5–24.9 (the healthy bmi range — around 55–74kg for 5ft 8in)
- Overweight: BMI 25–29.9 (approximately 75–88kg for 5ft 8in)
- Obese Class I: BMI 30–34.9 (roughly 89–104kg for 5ft 8in)
- Obese Class II: BMI 35–39.9 (approximately 105–118kg for 5ft 8in)
- Severely obese: BMI 40 and above (120kg and above for 5ft 8in)
Use our free BMI calculator above to find your exact BMI instantly, or try the weight converter on this page to see how your weight translates across different units.
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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.
BMI Limitations and What Else Matters
While a bmi graph is useful, it has important limitations. BMI doesn't distinguish between muscle and fat — a very muscular athlete might have a high BMI but excellent health. It also doesn't show where fat is stored; waist circumference is equally important. For this reason, the NHS recommends checking your waist measurement alongside BMI. Men with a waist over 94cm (37in) and women over 80cm (31.5in) face increased health risk even at a healthy BMI. Age, ethnicity, and medical history also affect what BMI means for you personally. Your GP can interpret your individual BMI in context and suggest next steps if needed.
- 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 in kg equals a BMI of 30?
A BMI of 30 depends on your height. At 5ft 8in (173cm), a BMI of 30 equals approximately 89kg. At 5ft 4in (163cm), it's about 79kg. Use our free BMI calculator above to find your exact threshold based on your own height.
Why does the NHS use the bmi categories uk scale?
The NHS uses BMI because it's a quick, evidence-based screening tool that works for most adults. It helps identify people at higher health risk from weight-related conditions like type 2 diabetes and heart disease. However, it's always used alongside other measures like waist circumference and medical history.
Is BMI accurate for everyone?
BMI is less accurate for very muscular people, older adults (who may have lost muscle), pregnant women, and some ethnic groups. The NHS recommends lower BMI thresholds for people of South Asian, Chinese, Black African, and Black Caribbean heritage due to higher cardiovascular risk at lower weights.
What's the difference between overweight bmi threshold and obese BMI?
Overweight BMI starts at 25 and goes to 29.9. Obese BMI starts at 30. The jump from 25 to 30 represents a significant increase in health risk, which is why the NHS treats these as distinct categories requiring different approaches to health management.
How accurate is a BMI graph compared to a calculator?
A BMI graph gives you a visual estimate, while a calculator gives you your exact BMI number. Both use the same formula. Our free BMI calculator on this page provides precision to one decimal place, making it easier to track small changes in your BMI 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.