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 9.2 Pounds in Kg?
9.2 pounds converts to approximately 4.17 kilograms. However, BMI depends entirely on your height — the same weight can be healthy, overweight, or obese depending on how tall you are. This weight is quite low for most adults, but context matters. Use our free BMI calculator above to find your exact BMI by entering your height and weight, or check the examples below to see where 4.17kg falls across different 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 Different Heights for 4.17kg
At 4.17kg, BMI varies significantly by height. Here are example BMI values across common heights:
- 150cm (4ft 11in): BMI 18.6 — Healthy weight (NHS category)
- 160cm (5ft 3in): BMI 16.3 — Underweight (below 18.5)
- 170cm (5ft 7in): BMI 14.4 — Underweight (below 18.5)
- 180cm (5ft 11in): BMI 12.9 — Underweight (below 18.5)
- 190cm (6ft 3in): BMI 11.5 — Underweight (below 18.5)
At very low body weights like 4.17kg, most adults would fall into the underweight category. If you weigh 9.2 pounds, it's important to check your BMI with your GP or using our calculator above, especially if this represents recent weight loss or health concerns.
Clinically BackedWeight Loss
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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 BMI Categories and Weight Context
NHS BMI categories are: underweight (below 18.5), healthy weight (18.5–24.9), overweight (25–29.9), and obese (30+). BMI has important limitations — it doesn't account for muscle mass, bone density, or where fat is stored on your body. At very low weights like 4.17kg, other health measures matter more than BMI alone. If you're concerned about being underweight, speak with your GP about whether nutritional support or medical assessment is needed. Our weight converter above helps you switch between pounds, kilograms, and stone — the standard UK measurement.
- 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 9.2 pounds to kilograms exactly?
Multiply 9.2 by 0.453592. This gives 4.17kg. You can also use our free weight converter on this page to convert between pounds, kg, and stone instantly. Metric to imperial weight conversions are straightforward once you know the formula.
Is 4.17kg a healthy weight for an adult?
No — 4.17kg is dangerously low for any adult. This weight would indicate severe underweight status and potential malnutrition. If you or someone you know weighs this little, please contact your GP immediately for medical assessment and support.
What does my BMI mean if I weigh 9.2 pounds?
BMI depends on your height. Use our free BMI calculator above — enter 4.17kg and your height to find your exact BMI. Then check it against NHS categories: healthy weight is BMI 18.5–24.9. At very low weights, BMI becomes less relevant than overall health status.
Why does BMI change so much at low weights?
Because BMI is calculated as weight divided by height squared. At very low weights, small height differences create large BMI variations. This is why BMI is less useful at extreme low or high weights compared to mid-range weights.
Should I use stone or kg to measure my weight in the UK?
Both are used in the UK — NHS uses kg clinically, but many people prefer stone and pounds. Use whichever makes sense to you. Our weight converter lets you switch between kg to stone, stone and pounds, or just kilograms easily.
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.