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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9.4 Pounds to Kg — What's Your BMI?
9.4 pounds converts to 4.26 kilograms — a relatively light weight that on its own doesn't indicate health status. Your BMI depends entirely on your height, so the same weight can fall into different NHS categories depending on how tall you are. This guide shows you what BMI this weight gives at various heights, helping you understand where you sit on the NHS weight classification scale. Use our free BMI calculator above to check your personal BMI instantly based on your exact height and weight.
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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 9.4 Pounds Give at Different Heights?
At 9.4 pounds (4.26 kg), your BMI varies significantly with height. Here are examples across common UK heights:
- At 5ft 0in (152cm): BMI 18.4 — healthy weight (NHS category)
- At 5ft 4in (163cm): BMI 15.9 — underweight
- At 5ft 8in (173cm): BMI 14.6 — underweight
- At 5ft 10in (178cm): BMI 13.5 — underweight
- At 6ft 0in (183cm): BMI 12.6 — underweight
This weight alone is too light for most adults — it's typically the weight of a young child or newborn. For adults, healthy weight depends on both your height and body composition. Use the weight converter on this page to convert between kg, stone, and pounds easily, and remember that sustainable health involves much more than a single number.
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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 uses standard BMI ranges to assess health risk across the adult population. A BMI below 18.5 is classified as underweight, which can indicate inadequate nutrition or underlying health issues. The healthy weight range is 18.5 to 24.9, while 25 to 29.9 is overweight, and 30 or above is obese. However, BMI has important limitations — it doesn't distinguish between muscle and fat, so athletes may have a high BMI despite low body fat. For people of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower thresholds starting at BMI 23 for overweight. Your GP can provide personalised guidance on 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.
How do I convert 9.4 pounds to kilograms accurately?
Multiply 9.4 by 0.453592 to get 4.26 kg. For quick reference, one pound equals approximately 0.454 kg. Our free weight converter above lets you convert instantly between pounds, kilograms, and stone without a UK pharmacy calculation.
Is 9.4 pounds a healthy weight for an adult?
9.4 pounds (4.26 kg) is too light for virtually all adult humans. It's roughly the weight of a newborn baby or small child. A healthy adult weight depends on height — use our BMI calculator to find the healthy weight range for your specific height using NHS guidelines.
What does it mean if my BMI is underweight?
A BMI below 18.5 suggests potential nutritional deficiencies or underlying health conditions. Underweight individuals may have weaker bones, reduced muscle mass, and lower immunity. If your BMI is underweight, speak with your GP to rule out medical causes and discuss whether dietary changes are needed.
How is BMI calculated, and why does height matter?
BMI = weight (kg) ÷ height (metres) squared. Height matters because taller people can carry more weight healthily. A person 6ft tall naturally weighs more than someone 5ft tall without being overweight. This is why two people with the same weight can have completely different BMIs.
Should I use BMI as my only health metric?
No. BMI is a useful screening tool but has limitations. It doesn't account for muscle mass, fat distribution, or where weight is carried. Waist circumference is also important — the NHS recommends measuring waist as well as calculating BMI for a fuller health picture.
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.