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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What BMI is 9.8 Kg in Stone?
9.8 kg converts to approximately 1 stone 8.6 lbs in UK measurements. However, your BMI depends on your height — not just your weight. At different heights, a weight of 9.8 kg gives very different BMI values and health categories. Use our free BMI calculator above to find your exact BMI instantly, or read on to see example BMI values at common UK heights. This guide shows you how weight in stone relates to your health status according to NHS guidelines.
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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 9.8 Kg — Examples by Height
Your BMI at 9.8 kg varies significantly depending on your height. Here are realistic examples at common UK heights:
- At 150 cm (4ft 11in): BMI = 43.6 — Obese (Class II) per NHS guidelines
- At 160 cm (5ft 3in): BMI = 38.3 — Obese (Class II)
- At 170 cm (5ft 7in): BMI = 33.9 — Obese (Class I)
- At 175 cm (5ft 9in): BMI = 32.0 — Obese (Class I)
- At 180 cm (5ft 11in): BMI = 30.2 — Obese (Class I)
- At 190 cm (6ft 3in): BMI = 27.1 — Overweight
At all these heights, 9.8 kg represents a weight associated with increased health risks according to NHS thresholds. Your GP can provide personalised advice based on your individual height and health circumstances.
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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 Explained
The NHS divides BMI ranges into five categories to help assess health risk. A BMI below 18.5 is underweight, 18.5–24.9 is healthy weight, 25–29.9 is overweight, 30–34.9 is Obese Class I, 35–39.9 is Obese Class II, and 40 and above is Severely Obese. It's important to note that BMI has limitations — it doesn't account for muscle mass, where fat is stored, or individual health factors. For people of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends slightly lower BMI thresholds due to higher health risks at the same BMI. Use our weight converter tool to switch between kilos, stone, and pounds, and consult your GP for personalised guidance on what your weight means for your specific 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 9.8 kg to stone and pounds?
To convert kg to stone, divide by 6.35. So 9.8 ÷ 6.35 = approximately 1.54 stone, which equals 1 stone 7.6 lbs. Use our free weight converter above for instant conversions between kilos, stone, and pounds.
Is 9.8 kg a healthy weight?
Whether 9.8 kg is healthy depends entirely on your height. At 150 cm, a BMI of 43.6 indicates obesity. At 190 cm, a BMI of 27.1 indicates overweight. Your GP can assess whether your weight is healthy for your specific height and circumstances.
What does Obese Class II BMI mean?
Obese Class II is a BMI of 35–39.9 according to NHS guidelines. This category indicates increased risk of type 2 diabetes, heart disease, and other weight-related health conditions. Your GP can discuss weight management options if relevant.
Are there different BMI categories for different ethnicities?
Yes. The NHS recommends lower BMI thresholds for people of South Asian, Chinese, Black African, and Black Caribbean heritage because these groups have higher health risks at the same BMI. Thresholds start at BMI 23 (overweight) instead of 25.
Can I use BMI alone to assess my health?
BMI is a useful screening tool but has limitations. It doesn't distinguish between muscle and fat, doesn't account for where fat is stored, and may not be accurate for elderly people or during pregnancy. Your GP can provide a more complete health assessment.
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.