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 in UK Measurements?
Half a stone is 7 pounds (lbs) or 3.175 kilograms (kg). It's a commonly used measurement in the UK for describing weight changes and body composition. Whether you're tracking weight loss progress, understanding NHS health guidance, or simply converting between UK measurements, knowing what half a stone represents helps you make sense of weight management conversations with your GP or when using health calculators. Our free weight converter tool makes it easy to switch between stone, pounds, and kilograms 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.
Half Stone to Kg and Pounds Conversion
Half a stone = 7 pounds (lbs) = 3.175 kilograms (kg)
To put this in context with other common conversions:
- 1 stone = 14 pounds = 6.35 kg
- Half a stone = 7 pounds = 3.175 kg
- Quarter stone = 3.5 pounds = 1.59 kg
The UK predominantly uses stone and pounds for body weight, unlike most of Europe which uses kilograms. This can make weight management discussions confusing when comparing international health advice. Use our free weight converter above to instantly switch between all three units. For NHS health guidance, remember that clinical measurements are recorded in kg, but many UK weight loss programmes and discussions still use stone and pounds.
When tracking weight loss or health progress, half a stone is a meaningful milestone. Losing half a stone represents approximately 3 kg of weight loss, which can have noticeable health benefits. According to NHS guidance, even a 5–10% reduction in body weight can improve blood pressure, blood sugar control, and overall fitness. If you're working with weight management tools or medication alongside lifestyle changes, understanding these measurements helps you set realistic goals. Try our BMI calculator to see how a half-stone change affects your personal BMI, or use our free progress tracker to log weight changes over time.
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.
Using Half Stone in Weight Management Context
Half a stone is often used as a stepping-stone goal in weight loss journeys. Rather than aiming for a large overall target, many people find it motivating to aim for half-stone reductions, which feel more achievable. If you're exploring weight management options—whether through lifestyle changes, dietary adjustments, or prescription support—understanding half-stone increments helps you track progress clearly. Your GP can advise on healthy weight targets for your height and health status. Remember that weight naturally fluctuates day-to-day due to hydration, meal timing, and hormonal changes, so tracking progress over weeks rather than days gives a more accurate picture.
- 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 much is half a stone in kilograms?
Half a stone equals 3.175 kg. To calculate this: 1 stone = 6.35 kg, so half a stone = 6.35 ÷ 2 = 3.175 kg. You can use our free weight converter above to switch between any units instantly.
Is losing half a stone in a month healthy?
Losing half a stone (3.175 kg) in one month is faster than the NHS-recommended rate of 0.5–1 kg per week. A safer target would be losing half a stone over 4–6 weeks. Always speak to your GP if you're losing weight rapidly or have health concerns.
What does half a stone mean in weight management?
Half a stone is a practical milestone used in UK weight loss tracking. It represents a meaningful change that can improve health markers like blood pressure and blood sugar. Many people use half-stone goals as stepping stones toward larger weight management targets.
How do I convert half a stone to pounds?
Half a stone = 7 pounds exactly. Since 1 stone always equals 14 pounds, half a stone is simply 14 ÷ 2 = 7 lbs. Our weight converter tool above makes all conversions instant and accurate.
Does weight loss of half a stone have health benefits?
Yes. NHS guidance shows that even 5–10% body weight reduction improves blood pressure, blood sugar control, and reduces disease risk. Half a stone loss (3.175 kg) could represent 5–10% of body weight for many adults, delivering meaningful health improvements.
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.