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
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Stone and Pounds — UK Weight Measurements Explained
Stone and pounds are the traditional UK measurements for body weight, used by most adults across Britain in everyday conversation and health discussions. Unlike kilograms, which are used in clinical NHS settings, stone and pounds remain deeply embedded in UK culture — from bathroom scales to clothing sizes to weight loss conversations. Understanding how these units work, and how to convert between them, is essential for tracking your health and interpreting weight-related NHS guidance. This guide covers everything you need to know about stone and pounds, plus how they relate to your overall health picture.
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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 and Pounds Work Together
Stone is the primary UK weight unit, with one stone equalling exactly 14 pounds. This relationship is fixed and never changes — making conversions straightforward once you understand the maths. An average UK adult woman weighs around 11 stone 3 pounds, whilst an average UK adult man weighs approximately 13 stone 7 pounds, according to the latest Office for National Statistics data.
When you see weight expressed as "11 stone 3 pounds" (written as 11st 3lbs), the first number is stones and the second is the remaining pounds. To convert to kilograms, use this formula: multiply stones by 6.35 and add pounds multiplied by 0.454. Alternatively, use our free weight converter above to do this instantly.
- 1 stone = 14 pounds (exactly)
- 1 stone = 6.35 kg (approximately)
- 1 pound = 0.454 kg
- 1 kg = 2.205 pounds
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, Pounds, and Your Health Context
Knowing your weight in stone and pounds is only part of understanding your health picture. Your BMI (Body Mass Index) — calculated from your weight and height — gives more meaningful context about whether your weight sits in a healthy range for NHS guidance. Use our free BMI calculator to check your personal BMI instantly and see where you fall within the NHS categories (healthy weight, overweight, or obese).
For UK adults, a healthy BMI sits between 18.5 and 24.9. If you weigh 11 stone and are 5ft 6in tall, for example, your BMI would be around 26 — falling into the overweight category. However, if you're of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower thresholds, with a healthy BMI starting at 18.5 and overweight starting at 23.0.
- 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 convert my weight from stone to kilograms?
Multiply the number of stones by 6.35, then add the pounds multiplied by 0.454. For example, 11 stone 3 pounds = (11 × 6.35) + (3 × 0.454) = 71.6 kg. Our free weight converter tool does this calculation instantly — just enter your weight above.
What's the difference between stone and pounds in UK measurements?
Stone is the main unit; one stone always equals 14 pounds. Weight is typically expressed as both — for example, "11 stone 3 pounds" means 11 full stones plus 3 additional pounds. Kilograms, used by the NHS, combine these into a single decimal number.
Why do UK adults still use stone and pounds instead of kilograms?
Stone and pounds are traditional UK measurements deeply embedded in British culture, dating back centuries. Most UK adults learned to use them growing up, so they remain the preferred everyday unit. However, the NHS uses kilograms for clinical measurements and health thresholds.
Is my weight healthy if I'm 12 stone? How do I check?
It depends on your height and body composition. A weight of 12 stone (76.2 kg) could be healthy or overweight depending on how tall you are. Use our free BMI calculator above to enter your height and weight — it will instantly show you whether you fall into the healthy weight, overweight, or obese category according to NHS guidelines.
Can I use stone and pounds with the NHS healthy weight guidance?
Yes. The NHS provides healthy weight ranges in kilograms, but you can convert these to stone and pounds using our weight converter tool. For example, an NHS healthy weight range of 50–67 kg converts to approximately 7st 12lbs to 10st 6lbs. Your GP can also discuss healthy weight targets in whichever unit you prefer.
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.