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
9 Stone 12 in Pounds — Quick Conversion
9 stone 12 pounds equals exactly 62.6 kg. If you're checking your weight in different units or monitoring your progress, understanding how to convert between stone and kilograms is useful for tracking health metrics. This UK health guide explains the conversion, puts the weight in context using NHS BMI guidance, and shows you how your weight compares to healthy weight ranges. Use our free weight converter above to switch between any measurements instantly, and check your BMI using our calculator to see where this weight falls on the NHS health scale.
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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 12 to Kilograms
9 stone 12 pounds = 62.6 kg
To calculate this conversion, we use the standard formula: stone × 6.35029 = kg. So 9.857 stone (9 stone + 12 pounds ÷ 14) × 6.35029 = 62.6 kg. This is the metric equivalent used by NHS health records and international health systems.
For reference:
- 9 stone 12 lbs = 62.6 kg
- 9 stone 12 lbs = 138.0 lbs (pounds)
- 9 stone 12 lbs = 62,600 grams
If you need to convert to other weights frequently, our free weight converter tool above lets you switch between stone, pounds, and kilograms instantly without mental maths. Most NHS health guidance and international weight management programmes use kilograms, so knowing your weight in kg is useful for medical appointments and health tracking.
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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.
BMI Context and Healthy Weight Range
At 62.6 kg, your BMI depends on your height. For example, at 5ft 6in (168 cm), a weight of 62.6 kg gives a BMI of approximately 20.2, which falls in the healthy weight range (18.5–24.9) according to NHS guidelines. However, at 5ft 2in (157 cm), the same weight would give a BMI of 22.8, still in the healthy range. Use our free BMI calculator above to calculate your exact BMI and see where you fall on the NHS health scale. If you're tracking weight loss or considering health changes, measuring your progress regularly helps. Our free progress tracker lets you log your weight and see trends over time, supporting sustainable health management.
- 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 12 to kg?
Multiply stone by 6.35029. So 9.857 stone × 6.35029 = 62.6 kg. Alternatively, convert to total pounds first (138 lbs) then divide by 2.20462 to get kg. Our weight converter tool above does this instantly for any weight you enter.
Is 9 stone 12 a healthy weight?
It depends on your height. At average UK female height (5ft 3.5in), 62.6 kg gives a BMI of around 21.8, which is healthy. At taller heights, it's also healthy. At shorter heights, it may fall higher on the BMI scale. Use our BMI calculator to check your personal BMI and get NHS-aligned guidance.
How does 9 stone 12 compare to average UK weight?
The average UK adult woman weighs around 71.6 kg (11st 3lbs), so 62.6 kg is lower than average. The average UK adult man weighs around 85.7 kg (13st 7lbs). Weight varies widely by age, height, muscle mass, and individual factors — BMI is a better indicator of health than comparing to averages.
What if I'm tracking weight loss around this figure?
Regular tracking helps identify trends. Weight fluctuates day-to-day due to hydration, food intake, and hormones — tracking weekly averages is more accurate than daily readings. Our free progress tracker lets you log weight over time and see real progress patterns, supporting sustainable weight management without obsessing over daily changes.
Can I use this weight with weight loss medication guidance?
Prescription weight loss medications are assessed by a healthcare provider based on your individual BMI, health conditions, and medical history — not a single weight figure. Your GP or a licensed prescriber will evaluate whether treatment is appropriate for you. GLP-1 medications like Mounjaro and Wegovy require prescription and clinical assessment before use.
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.