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 Is 8 Stone in Kilograms?
8 stone is equal to approximately 50.8 kilograms (kg). In the UK, we commonly use stone and pounds to describe body weight, but it's useful to understand both metric and imperial measurements for health records and medical consultations. This guide explains what 8 stone means in different units, how it relates to healthy weight ranges according to NHS guidance, and provides practical tools to assess your personal health context.
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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.
Converting 8 Stone to Other Measurements
8 stone converts as follows:
- 8 stone = 50.8 kg (kilogrammes)
- 8 stone = 112 lbs (pounds)
- 8 stone = 8 stone 0 lbs (exact)
To understand this conversion: 1 stone equals exactly 6.35 kg, so 8 stone × 6.35 = 50.8 kg. Alternatively, 1 stone equals 14 pounds, so 8 stone × 14 = 112 pounds. Use our free weight converter above to instantly switch between kg, stone, and pounds for any weight. These conversions are standard across NHS records, GP appointments, and UK health services, making it easy to track your weight in whichever unit you prefer.
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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.
Is 8 Stone a Healthy Weight?
Whether 8 stone (50.8 kg) is a healthy weight depends entirely on your height and individual health profile. According to NHS health guidance, a healthy BMI falls between 18.5 and 24.9. At 8 stone, your BMI could range from approximately 16.5 (if you're 1.75m tall) to 23.8 (if you're 1.45m tall). Calculate your personal BMI using our free BMI calculator above — enter your weight and height to see exactly where you fall on the NHS healthy weight scale. If you have concerns about your weight or health, your GP can provide personalised advice based on your complete health picture.
- 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 8 stone to kg quickly?
Divide 8 by 6.35029. 8 ÷ 6.35029 = 50.8 kg. Alternatively, use our free weight converter on this page to convert any weight instantly between kg, stone, and pounds without calculation.
Is 8 stone underweight?
Not necessarily. Whether 8 stone is underweight depends on your height. For someone 1.60m tall, 8 stone gives a BMI of approximately 19.8 (healthy range). For someone 1.45m tall, it's approximately 24.2 (still healthy). Use the BMI calculator above with your specific height to check.
What does 8 stone mean in pounds?
8 stone equals exactly 112 pounds. Since 1 stone = 14 pounds, multiply 8 × 14 = 112 lbs. Our weight converter can instantly show conversions for any weight you're interested in.
Can I use 8 stone as a target weight?
Your ideal target weight depends on your height, age, muscle mass, and overall health. Rather than focusing on a single number, NHS guidance recommends aiming for a healthy BMI range (18.5–24.9). Consult your GP to discuss what a realistic and healthy target weight range might be for you personally.
How does 8 stone compare to average UK adult weight?
The average UK adult woman weighs approximately 71.6 kg (11 st 3 lbs), and the average man weighs approximately 85.7 kg (13 st 7 lbs). At 50.8 kg (8 stone), this would be below UK adult averages. However, average weight is not the same as healthy weight — your GP or the BMI calculator can help you determine what's healthy for your specific height.
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.