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 6 Stone 12 Pounds in Kilograms?
6 stone 12 pounds is approximately 43.6 kg. This weight measurement is common in the UK, where stone and pounds remain the standard way adults describe their body weight. Whether you're converting from metric measurements, checking a health guideline, or tracking your weight loss journey, understanding how UK measurements translate is important for using NHS health guidance and our free tools effectively. Use our weight converter above to check this conversion instantly, or read on for context about healthy weight ranges and BMI for UK adults.
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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 Stone and Pounds to Kilograms
To convert 6 stone 12 pounds to kilograms, you multiply the stone value by 6.35029 and the pounds value by 0.453592. In this case: (6 × 6.35029) + (12 × 0.453592) = 43.64 kg, which rounds to 43.6 kg.
The reverse conversion works the same way — if you have 43.6 kg and want to convert back to UK measurements, divide by 6.35029 to get stone, then multiply the remaining decimal by 14 to get pounds. This gives you 6 stone 12 pounds again.
For practical UK health guidance, 43.6 kg is considered a healthy weight for most shorter adults and many young people. The NHS uses both metric (kg) and imperial (stone and pounds) measurements depending on the context, so knowing how to convert between them is useful when reading health information.
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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 and Healthy Weight Context for 6 Stone 12 Pounds
Whether 6 stone 12 pounds (43.6 kg) is a healthy weight depends entirely on your height. For example, at 5ft 4in (163 cm), a weight of 43.6 kg gives a BMI of 17.5, which falls comfortably in the healthy range (18.5–24.9). However, at 5ft 1in (155 cm), the same weight gives a BMI of 18.9, still healthy. At a taller height like 5ft 10in (178 cm), it would be underweight.
Use our free BMI calculator above to enter your exact height and weight and see where you fall on NHS guidelines. If you have concerns about whether your weight is healthy for your height and age, your GP can provide personalised advice based on 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 6 stone 12 pounds to kilograms?
Multiply 6 by 6.35029 (= 38.1) and 12 by 0.453592 (= 5.44), then add them together (= 43.54 kg, rounded to 43.6 kg). Our free weight converter above does this instantly — just enter the value and select your units.
Is 6 stone 12 pounds a healthy weight?
It depends on your height. Use the BMI calculator on this page with your height to see if 43.6 kg falls in the healthy range for you. BMI categories help, but your GP can give you personalised guidance about what's healthy for your individual circumstances.
What's the difference between stone, pounds, and kilograms?
Stone and pounds are UK imperial measurements; kilograms are metric. 1 stone = 14 pounds = 6.35 kg. The UK health system uses both systems, so knowing how to convert between them helps you understand NHS guidance and health information.
How much should I weigh if I'm 5ft 5in tall?
A healthy BMI range (18.5–24.9) for someone 5ft 5in (165 cm) tall is approximately 50–68 kg or 7st 12lbs to 10st 10lbs. Use our BMI calculator to find your exact healthy weight range based on your height.
Can I use this weight information to check my progress?
Yes. Our free progress tracker lets you log your weight over time and see trends. Tracking your weight in kilograms or stone — whichever you prefer — helps you monitor progress towards your health goals over weeks and months.
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.