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
How Long Does It Take to Lose 1 Stone?
Losing 1 stone (6.35kg) is a meaningful goal that can significantly improve your health and reduce strain on your body. In the UK, the NHS recommends a safe weight loss rate of 0.5 to 1kg per week, which means losing 1 stone typically takes between 6 to 12 weeks if you're consistent with dietary changes and physical activity. However, timelines vary depending on your starting weight, metabolism, and the methods you use. Whether you're aiming for this through lifestyle changes, prescription weight loss medication, or a combination of both, understanding what's realistic will help you stay motivated and healthy throughout your journey.
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.
Safe Weight Loss Rate and Timeline for 1 Stone
The NHS recommends losing no more than 0.5 to 1kg per week for sustainable, healthy weight loss. This means 1 stone (6.35kg) typically requires between 6 to 12 weeks to lose safely. At the faster end (1kg/week), you'd reach 1 stone in around 6 weeks; at the steadier pace (0.5kg/week), it takes approximately 12 weeks.
To achieve this rate, you'll need a calorie deficit of approximately 500 calories per day, which results in losing roughly 0.5kg weekly. A larger deficit (750–1000 kcal/day) can support 1kg/week loss, but this should be done carefully and ideally with professional guidance to avoid muscle loss.
- Check your current BMI using our free BMI calculator to understand your starting point
- Losing 1 stone may move you from an overweight to a healthy weight category
- Even small amounts of weight loss — as little as 5% of your body weight — can improve blood pressure, blood sugar control, and joint health
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.
Methods for Losing 1 Stone in the UK
There are several evidence-based approaches to achieving 1 stone weight loss. Lifestyle changes — including a balanced diet with reduced calories and increased physical activity — remain the foundation for sustainable weight loss. The NHS weight management pathway includes self-help tools, community programmes, and tier 3 specialist services where prescription weight loss medication may be considered.
Prescription weight loss medications like GLP-1 injections (Wegovy, Mounjaro) may help alongside diet and exercise if you meet NHS eligibility criteria. These are typically prescribed through NHS specialist services or private prescribing. Use our free GLP-1 weight loss calculator to estimate potential results, and our progress tracker to log your weight loss journey week by week, keeping you accountable and motivated.
- 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 weight is 1 stone in kilograms?
1 stone equals exactly 6.35029kg (often rounded to 6.35kg). You can convert between stone and kg instantly using our free weight converter. In pounds, 1 stone = 14 pounds, so 1 stone is approximately 14lbs.
Can I lose 1 stone in a month?
Losing 1 stone in 4 weeks would require a loss of approximately 1.6kg per week, which is faster than the NHS-recommended safe rate of 0.5–1kg/week. Very gradual weight management can result in muscle loss and nutritional deficiencies. Aim for 6–12 weeks instead for safer, more sustainable loss.
Will losing 1 stone improve my health?
Yes, significantly. Losing even 5% of your body weight can improve blood pressure, blood sugar control, reduce joint pain, and lower cholesterol. At 1 stone loss, you may also notice improved energy, better sleep, and reduced strain on your heart and joints.
What does the NHS recommend for weight loss?
The NHS recommends losing 0.5–1kg per week through a combination of reduced-calorie diet (around 500 kcal/day deficit) and increased physical activity. Weight loss medications are available through NHS tier 3 specialist services for eligible adults. Your GP can assess whether you qualify and refer you appropriately.
Can prescription weight loss medication help me lose 1 stone faster?
GLP-1 medications like Wegovy may help — clinical trials show average weight loss of around 15% of body weight over 68 weeks — but individual results vary. These are prescription-only and require a clinical assessment. They work best alongside diet and exercise, not as a replacement for lifestyle changes.
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.