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
Stone Measuring — Your UK Weight Health Guide
Stone is the primary weight measurement used by UK adults, though kilograms and pounds are equally important for health context. Understanding how to measure and interpret weight in stone helps you track your health effectively alongside NHS guidance. MyWeightCheck provides UK health information tools to help you convert between measurements, calculate your BMI, and understand what your weight means for your wellbeing using evidence-based NHS thresholds.
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 Measure and Understand Stone in the UK
Stone is a unit of weight traditionally used across the UK, with one stone equal to exactly 14 pounds or approximately 6.35 kilograms. UK adults typically discuss body weight in stone and pounds (for example, "11 stone 8 pounds"), making it essential to understand this measurement system for health conversations with your GP or when using NHS health resources.
- 1 stone = 14 pounds (lbs)
- 1 stone = 6.35 kilograms (kg)
- To convert kg to stone: divide by 6.35
- To convert stone to kg: multiply by 6.35
The NHS uses kilograms for clinical measurements and BMI calculations, but recognises that many UK patients prefer stone for everyday discussions about their weight. Understanding both measurements ensures you can communicate effectively with healthcare professionals and track your progress accurately across different health 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.
NHS Guidance and Healthy Weight Context for UK Adults
According to NHS guidance, a healthy weight is determined by your height and measured using BMI (Body Mass Index), which ranges from 18.5 to 24.9 for most adults. For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower BMI thresholds starting at 18.5 to 22.9 due to increased health risks at lower weights.
Your GP can provide personalised weight management advice using UK health information and evidence-based thresholds. Use our free BMI calculator above to check your personal BMI instantly, and try our weight converter tool to switch between stone, pounds, and kilograms whenever you need it. Tracking your weight regularly using consistent measurements helps you and your healthcare team monitor your health effectively.
- 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 is one stone in kilograms?
One stone equals 6.35 kilograms exactly. To convert any weight in kilograms to stone, divide the kilogram amount by 6.35. For example, 70kg divided by 6.35 equals approximately 11 stone. The weight converter on this page makes this conversion instant.
How do I measure stone and pounds correctly?
Stone and pounds are imperial weight measurements used across the UK. One stone contains 14 pounds. When stating weight in stone and pounds (e.g., "11 stone 8 pounds"), the number after "stone" represents additional pounds beyond the whole stones. Use a calibrated bathroom scale set to stone/pounds, or convert your kilogram reading using our free weight converter.
Is stone measuring still used by the NHS?
The NHS uses kilograms for clinical measurements and calculations like BMI, but understands that many UK adults prefer stone for everyday conversations about weight. Your GP will likely use kilograms in your medical record, but discussing your weight in stone is perfectly acceptable. Both measurements are equally valid in UK healthcare.
How does stone measuring relate to my healthy weight?
Your healthy weight range is determined by your height and BMI, not by a specific number in stone alone. Using our free BMI calculator, you can discover your healthy weight range in stone, pounds, and kilograms. The NHS recommends a BMI between 18.5 and 24.9 for most adults, which translates to a specific stone range depending on your height.
Can I track weight loss using stone measurements?
Yes, tracking weight loss in stone is common and practical in the UK. Aim for sustainable loss of 0.5 to 1 kilogram (approximately 1 to 2 pounds, or around 0.1 to 0.15 stone) per week. Use our free progress tracker to log your weight in any unit and watch your progress over time consistently.
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.