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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11.8 kg to Pounds — What's Your BMI?
11.8 kilograms is equal to approximately 26 pounds. However, whether this weight is healthy for you depends entirely on your height. To get a meaningful picture of your weight health, you need to calculate your BMI (Body Mass Index) — a simple measurement that combines your weight with your height. This guide shows what BMI 11.8 kg gives at different heights, and explains where it falls on the NHS weight categories scale. Use our free BMI calculator above to work out your personal BMI instantly, or check the examples below to understand your weight context.
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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.
What BMI Does 11.8 kg Give at Different Heights?
At 11.8 kg, your BMI depends entirely on how tall you are. Here are examples across typical UK adult heights:
- 5ft 0in (152cm): BMI = 51.0 — Severely obese (Class III)
- 5ft 4in (163cm): BMI = 44.3 — Severely obese (Class III)
- 5ft 8in (173cm): BMI = 39.1 — Obese (Class II)
- 5ft 10in (178cm): BMI = 37.4 — Obese (Class II)
- 6ft 0in (183cm): BMI = 35.2 — Obese (Class I)
- 6ft 2in (188cm): BMI = 33.3 — Obese (Class I)
To convert kilograms to stone using the standard metric to imperial weight conversion, 11.8 kg also equals approximately 1 stone 12 pounds. Use our free weight converter on this page to see your weight in different units instantly.
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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.
NHS BMI Categories and When to Speak to Your GP
The NHS classifies BMI ranges to help identify health risk levels. A healthy BMI is between 18.5 and 24.9. If your BMI is 30 or above, or 27 or above with weight-related health conditions, you may be eligible for support from your GP or a specialist weight management service. Weight in stone and pounds is important context, but BMI tells a clearer health story. BMI does have limitations — it doesn't account for muscle mass or where fat is stored — so your GP can provide personalised guidance. If you're concerned about your weight health, arrange an appointment with your GP to discuss your individual situation.
- 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.
How do I convert 11.8 kg to pounds exactly?
11.8 kg × 2.20462 = approximately 26.01 pounds. For everyday purposes, 11.8 kg is roughly 26 lbs. You can also express this as 1 stone 12 pounds using the stone to kg conversion standard. Our free weight converter above lets you switch between kg, stone, and pounds instantly.
Is 11.8 kg a healthy weight?
It depends on your height. 11.8 kg is quite low for most adults — it would result in an underweight BMI for typical adult heights. Underweight (BMI below 18.5) can carry health risks including weakened immune function and bone density loss. Speak to your GP if you're concerned about being underweight, as they can assess your individual health context.
What weight range is considered healthy at my height?
The healthy weight range depends on your height. Use our free BMI calculator above to find your personal healthy weight range based on your exact height. For example, at 5ft 8in (173cm), a healthy weight is between 55 kg and 74 kg. Your GP can also advise on what's appropriate for your individual circumstances and health goals.
How do I know if my weight is affecting my health?
Your GP can assess whether your current weight poses any health risks. Key indicators include your BMI, waist measurement, blood pressure, and whether you have any weight-related conditions like type 2 diabetes or high cholesterol. A BMI calculator helps identify your category, but a GP assessment is essential for personalised guidance on your health.
Should I aim to reach a specific weight?
Rather than targeting a single number, it's more helpful to aim for a healthy BMI range. Sustainable weight changes through balanced diet and physical activity are more effective than rapid loss. If you're tracking progress, our free progress tracker helps you log changes over time. Your GP or a registered dietitian can help you set realistic, health-focused goals.
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.