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 in Pounds — What's Your BMI?
11.8 kilograms equals 26 pounds exactly. However, your BMI depends entirely on your height, not just your weight alone. This guide shows you what BMI 11.8 kg gives at different heights, plus where that falls on the NHS weight scale. Whether you're tracking a child's weight, monitoring progress, or simply curious about metric to imperial weight conversions, understanding your BMI helps you see the full health picture. Use our free BMI calculator above to find your personal BMI instantly.
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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.
11.8 kg BMI at Different Heights
At 11.8 kg, your BMI varies significantly depending on height. Here are typical examples:
- 4ft 6in (137 cm): BMI 24.6 — Healthy weight
- 4ft 10in (147 cm): BMI 21.6 — Healthy weight
- 5ft 2in (157 cm): BMI 18.9 — Healthy weight
- 5ft 6in (168 cm): BMI 16.8 — Underweight
- 5ft 10in (178 cm): BMI 15.1 — Underweight
- 6ft 0in (183 cm): BMI 13.8 — Underweight
These examples show how the same weight (11.8 kg or 26 pounds) produces very different health categories across heights. For a more accurate picture, convert kilograms to stone using our weight converter, then calculate your specific BMI with the calculator on this page.
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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 classifies BMI into clear categories to help assess health risk. A healthy BMI for most adults is between 18.5 and 24.9. At 11.8 kg, most adult heights would fall into the underweight or very low end of healthy weight ranges. For South Asian, Chinese, Black African, or Black Caribbean adults, the NHS recommends slightly different thresholds due to higher health risks at lower BMI levels. Remember, BMI is a screening tool only — it doesn't account for muscle mass, bone density, or where fat is stored. Your GP can provide personalised guidance about what your BMI means for your individual health.
- 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 11.8 kg in pounds exactly?
11.8 kg equals exactly 26 pounds. This is a straightforward kilogram to pound conversion using the standard factor of 1 kg = 2.20462 lbs. If you prefer stone and pounds format, 26 pounds is 1 stone and 12 pounds. Use our weight converter above for instant conversions between kg, stone, and pounds.
Is 11.8 kg a healthy weight?
Whether 11.8 kg is healthy depends entirely on your height. For most adults, this weight would be significantly underweight. However, this weight is normal and healthy for young children and infants. If you're an adult weighing 11.8 kg, please consult your GP urgently. For children, use age-specific NHS growth charts rather than adult BMI categories.
What BMI does 11.8 kg give at 5ft 6in?
At 5ft 6in (168 cm), 11.8 kg gives a BMI of approximately 16.8, which falls in the underweight category (below 18.5). For adults, a BMI below 18.5 may indicate health risks. Your GP can assess whether your weight is appropriate for your individual circumstances and health goals.
How does 11.8 kg convert to stone?
11.8 kg equals 1 stone and 12 pounds (or 1st 12lbs). To convert kilograms to stone, divide by 6.35029. This is the standard metric to imperial weight conversion used across the UK. Our weight converter tool above makes these calculations instantly for any weight.
Can I use this BMI to assess a child's weight?
No. Adult BMI categories do not apply to children and young people. Children's weight is assessed using age and sex-specific centile charts (UK90 growth reference). Please use the NHS Healthy Weight Calculator for children, or ask your health visitor or GP for guidance on your child's weight development.
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.