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
Half A Stone In Lbs — Quick Conversion
Half a stone is exactly 7 pounds (7 lbs). This straightforward conversion is useful for understanding UK weight measurements, which blend imperial and metric units in everyday life. Whether you're tracking weight loss progress, understanding NHS health guidance, or simply converting between the stone and pounds measurements commonly used in the UK, knowing this conversion helps you make sense of your health data. Use our free weight converter above to switch between any weight units instantly.
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.
Understanding Stone and Pounds in UK Health Context
In the UK, weight is traditionally measured in stone and pounds, even though the NHS increasingly uses kilograms for clinical purposes. One stone equals exactly 14 pounds, so half a stone is 7 pounds. This matters because UK adults often discuss weight in stone — you might say "I weigh 12 stone" rather than 76kg. When tracking weight loss or understanding your NHS health guidance, being familiar with both imperial and metric conversions ensures you can interpret your data correctly. For context, losing half a stone (7 lbs, or approximately 3.2kg) over several weeks aligns with NHS recommendations for sustainable weight loss, which suggest losing around 0.5–1kg per week. Our free weight converter on this page lets you instantly switch between stone, pounds, and kilograms.
- 1 stone = 14 pounds exactly
- Half a stone = 7 pounds
- 7 pounds ≈ 3.2 kilograms
- This conversion is consistent across all weights
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.
How This Conversion Relates To Your BMI And Healthy Weight
Understanding weight conversions becomes especially important when discussing healthy weight and BMI. A change of half a stone (7 lbs) can meaningfully impact your BMI category — for someone 5ft 8in tall, half a stone represents roughly a 0.5 BMI point shift. According to NHS guidance, a healthy BMI sits between 18.5 and 24.9 for most adults, though lower thresholds apply for people of South Asian, Chinese, Black African, or Black Caribbean heritage. If you're working toward a weight loss goal with your GP or using prescription weight management support, tracking changes in familiar units like stone and pounds helps you stay motivated. Calculate your personal BMI using our free BMI calculator above to understand where you sit on the NHS health spectrum and what a half stone loss might mean for your individual health profile.
- 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.
Why do UK people use stone and pounds instead of just kilograms?
Stone and pounds are traditional imperial measurements deeply embedded in UK culture. While the NHS uses kilograms clinically, most UK adults still think and talk about weight in stone, making conversions between the two systems essential for understanding health information.
Is losing half a stone in a month a healthy goal?
Losing half a stone (7 lbs, approximately 3.2kg) over 4–6 weeks is reasonable and aligns with NHS guidance of 0.5–1kg per week. However, the safest approach involves consulting your GP about your individual circumstances, as healthy weight loss depends on your starting weight and health status.
How does half a stone weight loss affect BMI?
Half a stone (3.2kg) typically shifts your BMI by approximately 0.5–1 point depending on your height. For someone 5ft 8in tall, this could move you from one BMI category to the next. Use our free BMI calculator to see your personal baseline and projections.
Should I measure my weight progress in stone or kilograms?
Both are useful — stone feels natural to most UK adults, while kilograms are more precise for clinical purposes. Many people track in both, using stone for motivation and kilograms for medical records. Choose whichever you find easier to understand.
What does NHS guidance say about healthy weight loss rates?
The NHS recommends losing weight at a rate of 0.5–1kg (roughly half a stone to a full stone) per week as sustainable and safe. This typically requires a calorie deficit of around 500 calories daily and is best supported by your GP if you have underlying health conditions.
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.