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
BMI Graph in Kilograms — UK Health Reference
A BMI graph in kilograms helps you visualise where your weight falls across the healthy, overweight, and obese categories according to NHS guidelines. Understanding your position on a BMI graph is a practical first step in assessing your health status. The graph shows how weight relates to height, making it easy to see your BMI range at a glance. However, BMI has limitations — it doesn't account for muscle mass or where fat is stored — so it's best used alongside other health measures like waist circumference and your GP's clinical assessment.
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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 BMI Categories and What They Mean
The NHS BMI formula divides weight in kilograms by height in metres squared. NHS guidance defines these BMI categories for UK adults:
- Below 18.5: Underweight
- 18.5–24.9: Healthy weight (target range)
- 25.0–29.9: Overweight
- 30.0–34.9: Obese (Class I)
- 35.0–39.9: Obese (Class II)
- 40.0+: Severely obese (Class III)
If you have a South Asian, Chinese, Black African, or Black Caribbean background, the NHS recommends lower thresholds: healthy weight is 18.5–22.9, and overweight begins at 23.0. This reflects that these groups face higher health risks from weight-related conditions at lower BMI levels. Use our free BMI calculator above to find your personal BMI instantly, or check the healthy BMI range for your height.
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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.
When to Seek Help and NHS Support Available
If your BMI graph shows you fall into the overweight or obese range, your next step is to speak with your GP. The NHS offers a structured weight management pathway starting with tier 1 services (self-help and digital tools), progressing to tier 2 (primary care support), tier 3 (specialist weight management services), and tier 4 (bariatric surgery) for those who need it. Your GP can assess your individual health, discuss any weight-related conditions you may have, and recommend appropriate support — which may include behaviour change programmes, dietary advice, or prescription weight loss treatment if clinically appropriate. Don't worry about BMI limitations — your GP will look at the full picture, not BMI alone.
- 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 does a BMI graph actually show?
A BMI graph plots your weight in kilograms against your height to show which category you fall into — healthy weight, overweight, or obese. It's a visual reference tool based on the BMI formula (weight ÷ height²). Use our weight converter to find your weight in kilograms if you know it in stone or pounds, then locate yourself on the graph.
Are BMI graphs accurate for everyone?
BMI graphs are useful screening tools but have limitations. They don't distinguish between muscle and fat — athletes may have high BMI but low body fat. They also don't account for age, ethnicity, or where fat is stored. Your GP uses BMI alongside other measures like waist circumference and health checks for a complete picture.
What should I do if my BMI graph shows I'm overweight?
Start by booking a GP appointment. Your GP can assess your individual health, discuss any weight-related conditions, and recommend appropriate support. This might include lifestyle changes, NHS weight management programmes, or prescription weight loss options if suitable. Everyone's situation is different — your GP will tailor advice to you.
Do ethnic-specific BMI ranges really matter?
Yes. The NHS recommends that people of South Asian, Chinese, Black African, and Black Caribbean heritage use lower BMI thresholds because these groups have higher risk of type 2 diabetes and heart disease at the same BMI as other groups. Healthy weight for these groups is typically 18.5–22.9 rather than 18.5–24.9.
How often should I check my BMI using a graph?
Check your BMI monthly or quarterly as part of monitoring your health — not obsessively. Small fluctuations are normal. What matters more is the trend over weeks and months, combined with how you feel and your GP's health assessments. Our free progress tracker can help you log weight changes 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.