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 to Lose 2 Stone Safely and Sustainably
Losing 2 stone (12.7 kg) is an achievable goal that can significantly improve your health, particularly if you're currently overweight or obese. Most UK adults can realistically lose 2 stone through a combination of dietary changes, increased physical activity, and — for some people — prescription weight loss medication. The key is understanding what sustainable weight loss looks like, how long it typically takes, and whether medical support might help you. Our free BMI calculator can help you understand your current weight status and what 2 stone of weight loss might mean for your health profile. This guide covers everything you need to know about losing weight safely in the UK.
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 2 Stone
The NHS recommends losing weight at a rate of 0.5 to 1 kg (1 to 2 lbs) per week for sustainable, healthy results. At this rate, losing 2 stone (12.7 kg) would take approximately 12–25 weeks, or roughly 3–6 months. This timeline varies depending on your starting weight, age, metabolism, and lifestyle factors.
- Faster weight loss (over 1.5 kg per week) increases the risk of muscle loss, nutritional deficiencies, and difficulty maintaining the loss long-term
- A calorie deficit of approximately 500 kcal per day typically results in around 0.5 kg loss per week
- Combining reduced-calorie eating with increased physical activity tends to produce better results than diet or exercise alone
- Individual results vary significantly — some people lose weight more quickly, others more slowly, depending on genetics, medical conditions, and lifestyle
Our free progress tracker can help you log your weight loss journey and stay motivated as you work towards your 2-stone goal.
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.
Weight Loss Methods: Lifestyle vs Prescription Support
For most people, 2 stone weight loss begins with lifestyle changes: reducing calorie intake, eating more vegetables and whole grains, limiting processed foods, and moving more. The NHS Weight Loss Plan (free online) and community-based programmes offer proven support. However, prescription weight loss medication may help if lifestyle changes alone aren't working. In the UK, GLP-1 receptor agonist medications like Wegovy (semaglutide) are prescription-only treatments that may support weight management alongside diet and exercise. Clinical trials showed that Wegovy helped participants lose an average of around 15% of their body weight — though individual results vary considerably. Any prescription medication requires a clinical assessment from your GP or a licensed prescriber to determine eligibility. Our GLP-1 weight loss calculator can help you estimate potential outcomes with medical 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 long does it realistically take to lose 2 stone?
At the NHS-recommended safe rate of 0.5–1 kg per week, losing 2 stone (12.7 kg) typically takes 12–25 weeks, or roughly 3–6 months. This varies by individual based on starting weight, metabolism, diet consistency, and activity level. Faster loss is possible but may increase risks of muscle loss and difficulty maintaining results.
What does a 2-stone weight loss mean for my BMI?
The impact on your BMI depends on your height and current weight. For example, a person 5ft 8in tall weighing 100 kg (15st 10lbs) with a BMI of 32 would move to a BMI of 28 after losing 2 stone — moving from the obese into the overweight category. Use our free BMI calculator above to see what 2 stone would mean for your personal BMI.
Is 2 stone weight loss achievable without medication?
Yes — most people can lose 2 stone through lifestyle changes alone: eating fewer calories, choosing healthier foods, reducing portion sizes, and increasing physical activity like walking or cycling. However, some people find this challenging without support. Your GP can discuss whether prescription weight loss medication might help alongside lifestyle changes.
Can prescription weight loss injections help me lose 2 stone?
Prescription medications like Wegovy (semaglutide) are GLP-1 receptor agonist injections that may support weight loss alongside diet and exercise. Clinical trials showed average weight loss of around 15% of body weight — so for someone weighing 100 kg, this could equate to approximately 15 kg, or just over 2 stone. However, individual results vary, and these are prescription-only medicines requiring clinical assessment.
What health benefits come from losing 2 stone?
Even a 2-stone weight loss can bring meaningful health improvements: lower blood pressure, better blood sugar control, reduced joint strain, improved sleep quality, lower cholesterol, decreased cardiovascular disease risk, and improved energy levels. These benefits often appear before you reach your goal weight.
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.