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 and Lbs in UK Health
Stone and lbs are the traditional UK measurements for body weight, used in everyday life, healthcare, and fitness across Britain. Unlike most of Europe, UK adults measure weight in stone and pounds rather than kilograms. Understanding these units and how they relate to your health is essential for tracking weight, interpreting health advice, and using NHS guidance effectively. This guide explains the conversions, healthy weight ranges, and how stone and lbs fit into your personal health management.
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 Stone and Lbs Convert to Other Units
Stone is the primary UK unit, with 1 stone equalling exactly 14 pounds. To convert stone to kilograms, multiply by 6.35029. For example, 11 stone = 69.85kg. Pounds (lbs) are smaller units often used alongside stone — you'll see weights written as "11 stone 4 lbs" meaning 11 stone plus 4 additional pounds. Use our free weight converter above to switch between stone, lbs, and kg instantly. The formula for stone and lbs to kg is: (stone × 6.35029) + (lbs × 0.453592) = kg. An average UK adult man weighs approximately 85.7kg (13 stone 7 lbs), whilst an average adult woman weighs around 71.6kg (11 stone 3 lbs). These conversions are particularly useful when using the BMI calculator, since NHS health guidance often references both metric and imperial measurements.
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.
Stone and Lbs in UK Health Guidance
The NHS uses kilograms for clinical measurements and health records, but many UK adults still prefer stone and lbs for personal tracking. A healthy BMI range according to NHS guidance is 18.5 to 24.9, which translates to specific weight ranges depending on your height. For an adult 5ft 8in tall, the healthy weight range is approximately 8 stone 10 lbs to 11 stone 10 lbs. However, for adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower weight thresholds due to higher health risks at the same BMI. Understanding your weight in stone and lbs helps you communicate with your GP and track progress over time using familiar measurements.
- 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 the exact conversion from stone to kg?
1 stone equals 6.35029 kg. To convert stone to kg, multiply the number of stones by 6.35029. For example, 10 stone = 63.5kg. To convert back, divide kg by 6.35029. Our free weight converter can do this instantly for any value.
How many pounds are in one stone?
One stone equals exactly 14 pounds. This is the standard conversion used throughout the UK. So if someone weighs 12 stone 7 lbs, that's 175 lbs total (12 × 14 + 7). Stone and lbs are always written together for precision.
Why does the UK use stone and lbs instead of kg?
Stone and lbs are traditional UK and imperial measurements with deep historical roots. Most other countries use kilograms, but the UK retained stone and lbs for everyday use. The NHS and healthcare professionals understand both systems, so you can use whichever feels most natural.
How do I check my healthy weight range in stone and lbs?
Use the BMI calculator on this page, which converts your weight and shows whether you're in the healthy range according to NHS guidelines. For example, at 5ft 6in, a healthy weight is approximately 7 stone 11 lbs to 10 stone 6 lbs (BMI 18.5–24.9).
What's my healthy weight range at my height in stone?
Healthy weight ranges vary by height. The easiest way to find your exact range is to use our free BMI calculator above — enter your height in feet and inches, and it will show you the healthy stone and lbs range for NHS guidelines. Your GP can also provide personalised advice based on your overall health.
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.