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 9 Stone in Kilograms?
9 stone equals approximately 57.2 kg in metric measurements. If you're tracking your weight in UK health guidance or trying to understand your health metrics, knowing how to convert between stone and kilograms is essential. MyWeightCheck provides instant conversion tools and NHS-aligned health context to help you understand what your weight means for your wellbeing. Whether you're monitoring your progress or preparing for a health appointment, we've got the information you need.
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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 9 Stone to Kilograms — The Breakdown
9 stone = 57.2 kg exactly using the standard conversion factor of 1 stone = 6.35029 kg.
In pounds, 9 stone also equals 126 lbs. This conversion is based on the precise imperial-to-metric standard used by the NHS and UK health services.
If you need to convert different stone measurements, the formula is simple: multiply the number of stone by 6.35029. Our free weight converter on this page lets you switch between stone, kilograms, and pounds instantly — helpful whether you're tracking weight loss, preparing for a medical appointment, or simply understanding your UK health measurements.
Many UK adults prefer using stone for daily weight tracking, while NHS clinical records typically use kilograms. Having both measurements to hand makes communication with your GP and understanding your health data much easier.
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 9 Stone a Healthy Weight in the UK?
Whether 9 stone is a healthy weight depends on your height and age. According to NHS guidelines, a healthy BMI (Body Mass Index) ranges from 18.5 to 24.9 for most adults.
For example, at 5ft 4in (163 cm), 9 stone gives a BMI of approximately 21.5 — falling solidly in the healthy range. At 5ft 2in (157 cm), the same weight gives a BMI of around 22.6 — also healthy. However, at 5ft 10in (178 cm), 9 stone would give a BMI of approximately 18.4 — just below the healthy threshold.
Use our free BMI calculator above to check your personal BMI instantly based on your exact height and weight. Your GP can also provide personalised health advice about whether your current weight 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 9 stone to kilograms?
Multiply 9 by 6.35029, which gives 57.15 kg (rounded to 57.2 kg). Alternatively, use the free weight converter on this page for instant conversions between stone, kilograms, and pounds — no mental maths required.
Is 9 stone considered overweight in the UK?
Whether 9 stone is overweight depends entirely on your height. BMI categories according to NHS guidelines are healthy weight (18.5–24.9), overweight (25.0–29.9), and obese (30.0+). Use our BMI calculator above with your height to find out your personal BMI status.
What is the healthy weight range for an adult in the UK?
There is no single "healthy weight" — it depends on your height, age, sex, and muscle mass. NHS guidance recommends a BMI between 18.5 and 24.9 for most adults. For example, at 5ft 8in, healthy weight is approximately 8st 2lbs to 11st 3lbs. Your GP can advise on what weight is healthy for you individually.
Why do UK health services use kilograms if we measure weight in stone?
Kilograms are the international standard for clinical measurements, used by NHS hospitals and health records for consistency and accuracy. However, many UK adults naturally think in stone, so understanding both measurements helps you communicate with healthcare professionals and track your health effectively.
Can I track my weight loss progress using these conversions?
Yes — many people find it helpful to record weight in both stone and kilograms. Our free progress tracker on this page lets you log your weight measurements over time and see your journey in either unit, making it easier to spot trends and stay motivated.
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.