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 Pounds?
9 stone is exactly 126 pounds (or 126 lbs). In kilograms, 9 stone equals approximately 57.2 kg. This weight falls within the healthy range for many UK adults, depending on height. To understand whether this weight is right for you, it's helpful to know your height and calculate your BMI. The UK National Health Service (NHS) uses BMI as a screening tool to assess whether your weight is in a healthy range. Use our free weight converter above to switch between stone, pounds, and kilograms instantly, and our BMI calculator to check your personal health status.
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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.
How to Convert Stone to Pounds
The conversion between stone and pounds is straightforward because one stone always equals 14 pounds exactly. So to convert 9 stone to pounds, you simply multiply 9 by 14, which gives you 126 pounds.
- 9 stone × 14 = 126 lbs
- 126 lbs ÷ 14 = 9 stone
- 1 stone = 6.35029 kg
- 9 stone = 57.15261 kg (approximately 57.2 kg)
This is the standard conversion used across the UK health system, including the NHS. If you're working with both metric and imperial measurements — which is common in UK health contexts — our free weight converter on this page can calculate any conversion instantly. Whether you need to convert for a GP appointment, a diet programme, or personal tracking, these conversions are consistent across all NHS guidance and UK health information resources.
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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 9 Stone a Healthy Weight?
Whether 9 stone (126 lbs or 57.2 kg) is a healthy weight depends entirely on your height and body composition. The NHS uses Body Mass Index (BMI) to assess whether a weight is in the healthy range for an individual. A healthy BMI is between 18.5 and 24.9 for most UK adults. For example, at 5ft 6in (168 cm), 9 stone would give a BMI of approximately 20.7, which is well within the healthy range. However, at 5ft 0in (152 cm), the same weight would result in a higher BMI of around 25.6, which falls into the overweight category.
Use our free BMI calculator above to find your personal BMI and understand what your weight means for your health. If you're concerned about your weight or health, your GP can provide personalised advice based on your individual circumstances, medical history, and ethnic background.
- 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 pounds?
Multiply 9 stone by 14 (since one stone equals 14 pounds exactly). So 9 stone = 126 pounds. This is the standard conversion used across the UK.
What is 9 stone in kilograms?
9 stone is approximately 57.2 kg. To convert stone to kilograms, multiply by 6.35029. So 9 × 6.35029 = 57.15 kg (rounded to 57.2 kg).
Is 9 stone a healthy weight for an adult?
It depends on your height. A weight of 9 stone may be healthy for a taller person but overweight for a shorter person. Use your height and the 9 stone weight to calculate your BMI with our free BMI calculator — a healthy BMI is 18.5 to 24.9 according to NHS guidelines.
What height would make 9 stone a healthy weight?
For someone 5ft 6in tall, 9 stone gives a BMI of about 20.7, which is healthy. For someone 5ft 0in tall, it would be around 25.6, which is overweight. Your exact healthy weight range depends on your height — use our weight converter and BMI calculator to find yours.
How do I track if 9 stone is right for my health goals?
Start by calculating your BMI using your height and current weight. If you're working towards weight management, our free progress tracker allows you to log your weight over time and monitor changes. Your GP can also advise whether this weight is appropriate for your individual health situation.
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.