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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11.9 Kg To Pounds — BMI At Different Heights
11.9 kg converts to 26.2 pounds. However, whether this weight is healthy depends entirely on your height — the same weight gives very different BMI values for different people. This guide shows what BMI 11.9 kg represents at common UK heights, using our free BMI calculator to help you understand where you fall on the NHS health scale.
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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 Values For 11.9 Kg At Different Heights
11.9 kg is an unusually low body weight for an adult — it's typically seen only in young children or in clinical contexts. To understand the BMI context, here's what this weight gives at various heights using the standard metric to imperial weight conversion of 1 kg = 2.20462 lbs:
- At 140 cm (4ft 7in): BMI 6.1 — severely underweight (NHS category: underweight, below 18.5)
- At 150 cm (4ft 11in): BMI 5.3 — severely underweight
- At 160 cm (5ft 3in): BMI 4.6 — severely underweight
- At 170 cm (5ft 7in): BMI 4.1 — severely underweight
- At 180 cm (5ft 11in): BMI 3.7 — severely underweight
All of these BMI values fall well below the NHS healthy weight range of 18.5–24.9, indicating significant nutritional concern. Use our weight converter above to switch between kg, stone, and pounds instantly, and try our BMI calculator to see your personal BMI at your actual 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.
NHS BMI Categories & What Healthy Weight Means
The NHS defines BMI categories for all UK adults as follows: underweight (below 18.5), healthy weight (18.5–24.9), overweight (25.0–29.9), obese Class I (30.0–34.9), obese Class II (35.0–39.9), and severely obese (40.0+). At 11.9 kg, you would be in the severely underweight range regardless of adult height. It's important to note that BMI has limitations — it doesn't account for muscle mass, bone density, or age-related changes. For children, BMI categories are age and sex-specific and completely different from adult thresholds. If you're concerned about being significantly underweight, speak with your GP, who can assess your individual health status and provide personalised guidance.
- 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 is 11.9 kg in pounds?
11.9 kg converts to 26.2 pounds. To convert kilogram to stone, divide 11.9 by 6.35029, which gives 1 stone 12 pounds (1st 12lbs). Use the weight converter on this page to switch between different units instantly.
Is 11.9 kg a healthy weight for an adult?
No — 11.9 kg is far below the healthy weight range for any adult height. This weight is typical only in young children or clinical contexts. A GP should assess anyone at this weight to rule out underlying health concerns.
What BMI does 11.9 kg give at 160 cm?
At 160 cm (5ft 3in), a weight of 11.9 kg gives a BMI of 4.6, which is severely underweight. The NHS healthy BMI range is 18.5–24.9. Use our BMI calculator above to find your BMI at your exact height.
Why does BMI matter if the same weight can give different BMI values?
BMI matters because it adjusts for height — taller people naturally weigh more. A weight that's healthy for one height might be dangerously low for another. BMI helps your GP understand whether your weight is appropriate for your individual body frame.
Can I convert 11.9 kg to stone easily?
Yes — 11.9 kg equals 1 stone 12 pounds (1st 12lbs). The formula is: divide kg by 6.35029 to get stone. Our free weight converter on this page does the calculation instantly across kg, stone, and pounds.
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.