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's 6 Stone in Kg?
6 stone is equal to approximately 38.1 kg. This conversion uses the standard formula: 1 stone = 6.35029 kg. For UK adults, 38.1 kg falls into the underweight category according to NHS guidelines, with a healthy weight range typically starting around 50–75 kg depending on your height. If you're monitoring your weight for health reasons, use our free weight converter above to switch between metric and imperial measurements instantly, and check your personal BMI using our BMI calculator for context on what this weight means for your individual health.
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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 6 Stone to Kilograms
The conversion from stone to kilograms is straightforward: multiply the number of stone by 6.35029. So 6 stone × 6.35029 = 38.1 kg. This is the exact metric equivalent used by the NHS and all UK health services. Stone is primarily a UK measurement — most of Europe uses kilograms exclusively, but UK adults still commonly refer to body weight in stone and pounds. Understanding both measurements is helpful if you're consulting health resources online or discussing weight with healthcare professionals who may use either unit. Our free weight converter makes switching between kg, stone, and pounds instant and accurate.
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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.
Understanding Weight Categories at 6 Stone (38.1 kg)
At 6 stone (38.1 kg), weight categorisation depends entirely on your height. For an adult of average UK height (around 170 cm), 38.1 kg would fall into the underweight category (BMI below 18.5). For a much shorter adult, this weight might be healthier. The NHS recommends a healthy weight range of BMI 18.5–24.9 for most adults, with lower thresholds for adults of South Asian, Chinese, Black African, or Black Caribbean heritage due to higher health risks at the same BMI. Calculate your personal BMI instantly using our free BMI calculator above to understand where your weight sits in relation to your height and what this means for your health context.
- 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.
Is 6 stone (38.1 kg) a healthy weight?
It depends on your height. For most UK adults, 6 stone is underweight. A healthy weight varies significantly based on height — use our free BMI calculator to check your personal status. If you're concerned about being underweight, discuss with your GP, as this can indicate nutritional issues or underlying health conditions that need attention.
How do I convert 6 stone to kg?
Multiply 6 by 6.35029. The result is 38.1 kg. This is the standard conversion used by the NHS and all UK health services. Our weight converter on this page can do this instantly for any weight you need to convert between stone, pounds, and kilograms.
What's the difference between stone and kilograms?
Stone is primarily a UK measurement for body weight; kilograms are the metric standard used globally and by healthcare services. 1 stone equals exactly 14 pounds, and 1 stone equals 6.35029 kg. Most NHS health resources use kilograms, but UK patients often discuss weight in stone — understanding both is helpful.
If I weigh 6 stone, should I be concerned?
Being underweight (BMI below 18.5) can increase health risks including bone density loss and nutritional deficiencies. If you're significantly underweight, speak with your GP. They can assess your individual health, rule out underlying conditions, and advise on safe, healthy weight management alongside good nutrition and lifestyle.
How does 6 stone compare to average UK weight?
The average UK adult weighs around 80 kg (12 stone 8 lbs), so 6 stone is considerably lighter. Average weight varies by height, age, sex, and frame size. Your GP can advise on what a healthy weight range is for you personally — don't compare yourself to averages, as individual health needs are unique.
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.