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
What Is Half A Stone?
Half a stone is a traditional UK weight measurement equal to 7 pounds (lbs) or 3.175 kilograms (kg). It's commonly used in the UK when discussing weight changes, body weight, and health targets. Understanding stone-based measurements is important for UK adults managing their weight, as the NHS provides guidance in both metric and imperial units. Half a stone represents a practical milestone in weight management—often used to set realistic health goals or track progress over time.
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.
Half A Stone In Different Units
Half a stone equals:
- 7 pounds (lbs)
- 3.175 kilograms (kg)
- 3,175 grams (g)
To put this in context, half a stone is approximately one-quarter of an average UK adult's weekly weight loss goal. The NHS recommends sustainable weight loss of 0.5 to 1 kg per week, which means losing half a stone would typically take 3 to 6 weeks of healthy, consistent effort. Use our free weight converter above to switch between stone, pounds, and kilograms instantly. For context on what a healthy weight range looks like for your height, try our free BMI calculator to see where you currently stand according to NHS guidance.
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.
Half A Stone In Weight Management
Half a stone is often used as a realistic short-term weight management target. Losing half a stone can bring meaningful health benefits—even small reductions in body weight improve blood pressure, blood sugar control, and reduce strain on joints. For UK adults, reaching a half-stone weight loss milestone is an achievable goal that helps build momentum. Whether you're managing your weight through lifestyle changes, working with your GP, or considering evidence-based treatment options, understanding these measurements helps you set clearer targets. Track your weight loss progress over time using our free progress tracker, and discuss realistic goals with your healthcare provider.
- 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.
Is half a stone a lot of weight to lose?
Half a stone (3.175 kg) is a modest but meaningful weight loss goal. The NHS recommends losing 0.5 to 1 kg per week, so half a stone typically takes 3 to 6 weeks to achieve safely. Even this small amount can improve blood pressure, joint health, and blood sugar levels. It's a realistic, achievable milestone that builds confidence for further progress.
How many pounds is half a stone?
Half a stone equals exactly 7 pounds (lbs). One full stone equals 14 pounds, so half a stone is 14 divided by 2, which is 7 lbs. This is a key UK measurement conversion—stone is still the primary way UK adults discuss body weight, though GPs and NHS services also use kilograms.
What does half a stone weight loss mean for health?
Losing half a stone (3.175 kg or 7 lbs) can have real health benefits. Studies show that even a 5% body weight reduction improves cardiovascular health, reduces diabetes risk, and eases joint pain. For most UK adults, half a stone loss improves energy levels and mobility. Your GP can advise on health gains specific to your individual circumstances.
How long does it take to lose half a stone?
Losing half a stone safely typically takes 3 to 6 weeks, following the NHS recommendation of 0.5 to 1 kg (1 to 2 lbs) per week. This rate is sustainable and helps preserve muscle mass. Speed varies depending on your current weight, diet, and activity level—your GP can advise on realistic timescales for your situation.
How does half a stone relate to BMI?
Half a stone (3.175 kg) can shift your BMI category depending on your height. For example, at 5ft 9in, losing half a stone might move you from overweight to healthy weight range. Use our free BMI calculator above to see how a half-stone loss would affect your personal BMI and where you'd stand against NHS healthy weight guidelines.
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.