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 8.5 Stone in Kilograms?
8.5 stone is equivalent to approximately 53.98 kg (or 119 lbs). This conversion uses the standard UK to metric formula. If you're tracking your weight using UK health guidance or comparing measurements across different systems, our free weight converter above makes it easy to switch between stone, kilograms, and pounds instantly. Understanding your weight in both metric and imperial units helps when consulting NHS resources or speaking with your GP about your health.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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 8.5 Stone to Other Units
8.5 stone = 53.98 kg (kilograms)
8.5 stone = 119 lbs (pounds)
To calculate this manually: multiply stone by 6.35029 to get kilograms. So 8.5 × 6.35029 = 53.98 kg. For pounds, multiply stone by 14 (since 1 stone = 14 pounds exactly), giving 8.5 × 14 = 119 lbs.
Our free weight converter on this page handles all these conversions instantly — just enter your weight and select your preferred units. This is particularly useful if you're working with NHS guidance, which typically uses metric measurements (kg), while many UK adults still prefer thinking in stone and pounds for their personal weight tracking.
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
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 8.5 Stone a Healthy Weight?
Whether 8.5 stone (53.98 kg) is healthy depends entirely on your height. To determine this, calculate your BMI using your weight and height. Use our free BMI calculator above to get your personal BMI instantly.
For example, at 5ft 5in (165cm), 8.5 stone gives a BMI of 18.2 — within the NHS healthy range of 18.5 to 24.9. However, at 5ft 0in (152cm), the same weight would give a BMI of 19.2 — also healthy. At taller heights, 8.5 stone would be lower on the healthy spectrum. Your GP can discuss what weight range is appropriate for your individual health profile.
- 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 8.5 stone to kilograms?
Multiply 8.5 by 6.35029. So 8.5 stone = 53.98 kg exactly. Use our free weight converter on this page to convert instantly between stone, kg, and pounds without doing the maths yourself. This is helpful if you're comparing your weight to NHS health guidance or international standards.
What is 8.5 stone in pounds?
8.5 stone = 119 pounds. Since 1 stone = exactly 14 pounds, multiply 8.5 × 14 = 119 lbs. Our weight converter handles this conversion instantly if you need to switch between units for any reason.
Is 8.5 stone overweight?
It depends on your height. Calculate your BMI using our free BMI calculator to find out. At average UK heights (5ft 4in to 5ft 8in), 8.5 stone typically falls within the healthy weight range. But BMI varies significantly by height, so you need to check your personal BMI to know for certain.
How does 8.5 stone compare to average UK weight?
The average UK adult woman weighs approximately 71.6 kg (11st 3lbs) and the average man weighs approximately 85.7 kg (13st 7lbs). At 8.5 stone (53.98 kg), this is lighter than average — likely a healthy weight for someone of shorter stature. Your GP can advise on what's healthy for you personally.
What tools can help me track my weight?
MyWeightCheck provides free tools including our BMI calculator (to check if your weight is healthy for your height), weight converter (to switch between units), and progress tracker (to log weight changes over time). These help you understand your weight in context and monitor your health journey effectively.
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.