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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11.5 Pounds in Kg — BMI at Different Heights
11.5 pounds converts to approximately 5.2 kilograms. This is a relatively light weight — what it means for your health depends entirely on your height. Using our free BMI calculator, we can show you what BMI this weight gives across different heights, and how it compares to NHS healthy weight guidelines. Your BMI helps indicate whether your weight is in a healthy range for your particular height.
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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.
BMI at Different Heights for 11.5 Pounds (5.2 kg)
11.5 pounds (5.2 kg) is quite light, so BMI varies significantly based on height. Here's what BMI this weight gives at common UK adult heights:
- 4ft 10in (147cm): BMI 24.1 — Healthy weight
- 5ft 0in (152cm): BMI 22.5 — Healthy weight
- 5ft 4in (163cm): BMI 19.5 — Healthy weight
- 5ft 8in (173cm): BMI 17.4 — Underweight
- 5ft 10in (178cm): BMI 16.4 — Underweight
- 6ft 0in (183cm): BMI 15.5 — Underweight
At typical adult heights, 11.5 pounds falls in the underweight category for most people. If you want to check your personal BMI, use our free BMI calculator above — it accounts for your exact height and gives instant NHS-aligned guidance.
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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 Why This Matters
The NHS recognises BMI ranges that indicate different health risks. A BMI below 18.5 is classified as underweight, which can increase risk of nutritional deficiencies and bone health issues. The healthy range is 18.5–24.9 for most adults. For people of South Asian, Chinese, Black African, or Black Caribbean heritage, NHS guidelines recommend slightly lower thresholds, with the healthy range starting at 18.5–22.9.
However, BMI has limitations — it doesn't account for muscle mass versus fat, or where fat is stored. Your GP can provide personalised health advice based on your individual circumstances, medical history, and overall fitness.
- 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 11.5 pounds to kilograms?
Multiply 11.5 by 0.453592. This gives 5.2 kg. You can also use our free weight converter above, which instantly converts between pounds, kilograms, stone, and pounds — useful if you're comparing metric to imperial weight measurements across NHS and other health resources.
What BMI would 11.5 pounds give me?
It depends on your height. At 5ft 4in, 11.5 pounds gives a BMI of 19.5 (healthy weight). At 6ft tall, it gives 15.5 (underweight). Use the free BMI calculator on this page to find your exact BMI by entering your height.
Is 11.5 pounds a healthy weight?
This weight is very light for most adults and would likely be underweight at typical adult heights (above 5ft 6in). However, "healthy weight" depends on your individual height, age, muscle mass, and overall health. Your GP can advise whether this weight is appropriate for you.
How do I use kg to stone conversion?
To convert kilograms to stone, divide by 6.35. So 5.2 kg ÷ 6.35 = 0.82 stone (approximately 11.5 pounds). Our weight converter above makes this instant — it also handles stone and pounds conversions for UK-style measurements.
What should I do if my BMI is underweight?
If your BMI is below 18.5, it's worth speaking to your GP. They can assess whether you need nutritional support, investigate any underlying causes, and ensure you're eating enough to support your health. Being underweight can affect bone density and immune function.
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.