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
Understanding Stone Measuring for UK Health
Stone measuring is the standard way UK adults track body weight, but many people aren't sure exactly how it works or how to use it for health decisions. Unlike kilograms used across Europe, stone divides weight into whole units plus pounds, making it intuitive for many UK residents. Whether you're checking your healthy weight range, tracking progress, or discussing weight with your GP, understanding stone measuring is essential for managing your health effectively using NHS guidance and UK health information standards.
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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 Stone Measuring Works
One stone equals exactly 14 pounds (lbs), and one pound equals 0.453592 kilograms. To measure your weight in stone, your total weight in pounds is divided by 14 — the whole number is the stone measurement, and the remainder in pounds is added. For example, someone weighing 154 pounds is 11 stone (154 ÷ 14 = 11 stone exactly). If you weigh 160 pounds, that's 11 stone 6 lbs (11 stone plus 6 remaining pounds).
- Stone is abbreviated as "st" and pounds as "lbs"
- Written format: 11st 6lbs or 11 stone 6 pounds
- Always express the full measurement — stone alone doesn't give the complete picture
- NHS guidance uses kilograms clinically but recognises that UK patients often prefer stone
Understanding this system helps you interpret weight measurements from your GP, track your progress effectively, and compare your weight to healthy weight ranges used across UK health services.
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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.
Converting Stone to Kilograms and Using Weight Management Tools
To convert stone to kilograms, multiply your stone measurement by 6.35029. For example, 11 stone equals approximately 69.85 kg. You can also use our free weight converter tool on this page to switch instantly between stone, pounds, and kilograms — no a UK pharmacy calculations needed. Once you know your weight in either unit, use our BMI calculator to check where your weight falls on the NHS healthy weight scale for your height. This gives you immediate, actionable UK health information you can discuss with your GP or use for weight management planning.
- Conversion: stone × 6.35029 = kilograms
- Example: 11 stone (154 lbs) ≈ 69.85 kg
- NHS healthy weight range: BMI 18.5–24.9
- 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 measure my weight accurately in stone?
Use calibrated bathroom scales set on a flat, hard floor. Weigh yourself at the same time each day (usually morning, after using the toilet but before eating). Wear minimal clothing. Record your weight in either pounds or kilograms, then convert to stone: divide total pounds by 14. Most scales now display both imperial and metric, making this easier. Consistency matters more than a single measurement — track weekly averages rather than daily fluctuations.
What is the healthy weight range in stone for UK adults?
According to NHS guidance, a healthy BMI is 18.5–24.9, which varies by height. For someone 5ft 8in (173cm), the healthy range is approximately 8st 10lbs to 11st 10lbs. Use our free BMI calculator above (enter your height and weight in stone or kg) to find your personal healthy range instantly. For South Asian, Chinese, Black African, or Black Caribbean adults, NHS recommends slightly lower thresholds — discuss your ideal range with your GP.
Why do UK people use stone instead of kilograms?
Stone is a traditional British imperial measurement that's deeply embedded in UK culture and language. Many UK adults grew up discussing weight in stone and pounds, making it intuitive and relatable. Although the NHS uses kilograms for clinical records, patients typically discuss weight with their GP in stone. This hybrid approach — medical staff using kg, but communicating with patients in stone — remains standard across UK health services. Both measurements are equally valid; use whichever feels most natural to you.
Can I use stone measuring to track weight loss progress?
Yes — stone is ideal for tracking progress. Many UK weight management programmes, including NHS services and weight loss support groups, use stone. You can weigh yourself weekly and record both stone and pounds to spot trends. For more structured tracking, our free progress tracker tool allows you to log measurements over time, calculate average weekly loss, and set milestones in stone. Regular tracking (weekly, not daily) shows real progress and helps you stay motivated through your health journey.
Is stone measuring used in UK medical records and GP consultations?
Your GP's clinical records use kilograms for consistency with NHS systems and medical guidelines. However, GPs routinely discuss your weight with you in stone and pounds because that's how UK patients understand it best. When booking appointments or online health platforms, you may see weight requested in kilograms — use our weight converter tool to switch between units easily. Both are equally accurate; your GP will help interpret your measurements in whichever unit feels most useful for your health decisions.
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.