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
Stones to Kg Converter — NHS UK Weight Guide
Converting your weight from stones to kilograms is straightforward using the standard conversion rate. One stone equals 6.35 kilograms exactly, so to convert any weight in stones to kg, simply multiply by 6.35. Whether you're tracking your health for NHS guidance, checking your weight against healthy ranges, or preparing for a GP appointment, having your weight in both UK and metric units is useful. Use our free weight converter above to switch between stones, pounds, and kilograms instantly, and discover how your weight relates to NHS health recommendations for UK adults.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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 Stones to Kilograms
The conversion formula is simple: multiply your weight in stones by 6.35 to get kilograms. For example, 11 stone × 6.35 = approximately 69.85 kg. Conversely, to convert kg to stones, divide the kilogram figure by 6.35.
- 1 stone = 6.35 kg (exactly)
- 14 pounds = 1 stone
- 1 kg = 0.157 stone
According to NHS health guidance, understanding your weight in both metric and imperial units is helpful when discussing your health with your GP, reading health information online, or using our free BMI calculator to check whether your weight sits in a healthy range. Many UK adults find it easier to track weight changes in stones and pounds, whilst medical professionals often record weight in kilograms for consistency.
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.
NHS Healthy Weight Ranges for UK Adults
The NHS defines a healthy weight using Body Mass Index (BMI), with a target range of 18.5 to 24.9 for most UK adults. For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower thresholds starting at 18.5 to 22.9 due to higher health risks at lower BMI levels. Once you know your weight in kilograms and your height in centimetres, you can calculate your BMI instantly using our free BMI calculator on this page. Your GP can offer personalised advice about what a healthy weight means for you based on your individual health, age, and any existing health conditions.
- 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.
What's the exact conversion from stone to kg?
One stone equals exactly 6.35029 kilograms. To convert, multiply your stone weight by 6.35. For example, 12 stone = 76.2 kg. For quick conversions, our free weight converter above gives you gradual improvement in stones, pounds, and kilograms.
Why do NHS documents use kg instead of stone?
The NHS uses kilograms because it's the metric standard used across Europe and clinical medicine globally. However, most UK adults prefer measuring themselves in stone and pounds at home. Both are equally valid — it's simply about which unit feels more natural to you.
How does my weight in kg relate to NHS health guidance?
Your weight in kg is used alongside your height to calculate BMI, which the NHS uses as a screening tool for healthy weight. A healthy BMI is 18.5–24.9 for most adults. Try our free BMI calculator to see where your weight in kg and your height places you against NHS guidelines.
Should I track my weight in stones or kilograms?
Choose whichever you find easier — many UK adults track in stones and pounds at home, then convert to kg when discussing health with their GP. Consistency matters more than the unit. Our free progress tracker lets you log weight in whichever unit you prefer.
What if I'm not sure if my weight is healthy?
Your GP is the best resource for personalised advice. You can also use the free BMI calculator on this page to see whether your weight falls into a healthy range according to NHS guidelines, but individual health depends on many factors beyond BMI.
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.