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
What BMI Is 11.2 lbs to kg?
11.2 lbs is approximately 5.08 kg — a relatively light weight that would typically indicate underweight status in adults according to NHS guidelines. However, your BMI depends entirely on your height. At different heights, this weight gives very different BMI values, and understanding where you fall on the NHS BMI scale is important for your health context. Use our free BMI calculator above to find your exact BMI instantly, or explore the examples below to see how this weight translates across various heights.
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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 11.2 lbs (5.08 kg) — Different Heights
To convert 11.2 lbs to kg, divide by 2.20462: 11.2 ÷ 2.20462 = 5.08 kg. Your BMI depends on height, so here's what this weight gives across typical adult heights:
- 5ft 0in (152cm): BMI 13.9 — Underweight (NHS: under 18.5 is underweight)
- 5ft 4in (163cm): BMI 12.0 — Underweight
- 5ft 8in (173cm): BMI 10.7 — Underweight
- 5ft 10in (178cm): BMI 10.1 — Underweight
- 6ft 0in (183cm): BMI 9.3 — Underweight
- 6ft 2in (188cm): BMI 8.6 — Underweight
At all adult heights, 5.08 kg falls well below the healthy weight range. If this is your actual weight, speak to your GP urgently, as being significantly underweight carries health risks including nutritional deficiency, weakened immunity, and bone density problems.
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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 NHS BMI Categories
The NHS BMI scale defines healthy weight as BMI 18.5–24.9 for most adults. Underweight (BMI under 18.5) is a medical concern. BMI limitations: it doesn't account for muscle mass, age, ethnicity, or body composition — athletes may have high BMI but low body fat. For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, lower thresholds apply (healthy range: 18.5–22.9). Calculate your personal healthy weight range using our weight converter and BMI calculator to see what weight gives you a healthy BMI at your height. Always consult your GP if you're concerned about your weight or have symptoms of being underweight.
- 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 11.2 lbs to kg exactly?
Divide 11.2 by 2.20462 to get 5.08 kg. This is the precise metric conversion. You can also use our free weight converter above for instant conversions between lbs, kg, and stone — useful if you need to work with different measurement units regularly.
Is 11.2 lbs a healthy weight?
11.2 lbs (5.08 kg) is exceptionally low for any adult at any height. It falls well into the underweight category across all typical adult heights. Being significantly underweight carries serious health risks. If this is your actual current weight, contact your GP immediately for medical assessment.
What BMI does 11.2 lbs give at 5ft 8in?
At 5ft 8in (173 cm), 11.2 lbs gives a BMI of approximately 10.7 — severely underweight. The healthy BMI range at this height is 18.5–24.9. You can use our free BMI calculator above to check your exact BMI at your specific height instantly.
Should I be concerned about being this weight?
Yes. If you weigh 11.2 lbs as an adult, this is a serious medical concern requiring urgent GP assessment. Severe underweight status is associated with malnutrition, weak immunity, bone loss, and other complications. Your GP can investigate the cause and recommend appropriate support.
How does 11.2 lbs compare to average UK adult weight?
Average UK adult weight is around 85.7 kg for men and 71.6 kg for women — vastly higher than 11.2 lbs. This weight would be appropriate only for a very young child, not an adult. If you're an adult at this weight, medical attention is needed.
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.