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 Does 1 Stone Weight Loss Really Mean?
Losing 1 stone (14 pounds or 6.35 kg) is a significant milestone in any weight management journey. In the UK context, this represents a meaningful shift in your health markers — including your BMI, cardiovascular health, and overall fitness. Whether you're pursuing weight loss through lifestyle changes, NHS weight management programmes, or prescription weight loss medication, understanding what 1 stone of weight loss actually means for your body is essential. This guide explains the real health impact of this achievement and how it translates across different measurement systems.
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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.
Health Impact of Losing 1 Stone
Losing 1 stone (6.35 kg) typically results in a BMI reduction of approximately 2–2.5 points, depending on your height. For example, if you're 5ft 8in (173 cm) tall, losing 1 stone could move you from a BMI of 32 (obese category) down to approximately 30 (still obese, but closer to the overweight threshold of 30). Use our free BMI calculator to see your personal change.
Beyond the numbers, research shows that a 5–10% body weight reduction — which 1 stone represents for most adults — can deliver measurable health benefits: lower blood pressure, improved blood sugar control, reduced strain on joints, and decreased cardiovascular disease risk. The NHS emphasises that even modest weight loss at this level supports better metabolic health and can reduce symptoms of obesity-related conditions like sleep apnoea and type 2 diabetes.
The rate matters too. Losing 1 stone over 8–12 weeks (sustainable pace) is healthier than rapid loss, as it typically involves fat loss rather than muscle loss.
Clinically BackedWeight Loss
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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.
Reaching 1 Stone Loss With Different Approaches
Through lifestyle changes alone — reduced calorie intake and increased physical activity — losing 1 stone typically takes 8–14 weeks, depending on your starting point and adherence. A calorie deficit of 500 kcal per day creates roughly 0.5 kg (1.1 lbs) weekly loss, reaching 1 stone in about 12 weeks.
With prescription weight loss medication such as Wegovy (semaglutide) or Mounjaro (tirzepatide), participants in clinical trials achieved similar or faster loss when combined with diet and exercise. Wegovy clinical trials showed average weight loss of around 15% body weight — meaning someone at 100 kg might lose 15 kg (2 stone 5 lbs) over 68 weeks. The GLP-1 mechanism supports appetite reduction, making the calorie deficit easier to achieve.
Try our free GLP-1 weight loss calculator to estimate potential weight loss timelines with medication support.
- 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 1 stone in kg and lbs?
1 stone equals exactly 6.35 kg or 14 pounds. In mixed notation used in the UK, 1 stone is often written as "14 lbs" or "1st 0lbs". Our free weight converter lets you instantly switch between stone, kilograms, and pounds for any weight value.
What BMI change does losing 1 stone create?
The BMI reduction from losing 1 stone depends on your height. For a person 5ft 8in (173 cm) tall, it reduces BMI by approximately 2.3 points. Someone at 100 kg (BMI 33.5) would drop to 93.65 kg (BMI 31.2). Use our BMI calculator to see your personal change based on your starting weight and height.
How long does it take to lose 1 stone safely?
The NHS recommends losing 0.5–1 kg per week, which means 1 stone takes 8–14 weeks through lifestyle changes. With prescription weight loss medication combined with diet and exercise, timelines may be similar or faster. Individual results vary based on starting weight, metabolic rate, and adherence.
What health improvements happen at 1 stone loss?
Losing 1 stone can improve blood pressure, blood sugar control, joint health, and reduce cardiovascular disease risk. Many people report better sleep quality, increased energy, and reduced symptoms of weight-related conditions. These benefits align with NHS guidance on the health gains from modest weight loss.
Can I lose 1 stone with weight loss injections like Wegovy?
Yes. Wegovy (semaglutide) is a prescription-only GLP-1 weight loss injection licensed in the UK. Clinical trials showed average weight loss of approximately 15% body weight. At this rate, someone weighing 100 kg might lose roughly 15 kg over the trial period. Prescription is required following clinical assessment. Individual results vary significantly.
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.