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 Mean for Your Health?
Losing 1 stone (14 pounds or approximately 6.35 kg) is a significant health milestone that many people aim for when starting their weight management journey in the UK. A 1 stone reduction can improve blood pressure, reduce type 2 diabetes risk, and ease joint strain — even before reaching an ideal BMI. Whether through lifestyle changes alone or with prescription weight loss support, this target is achievable for many adults. Use our free BMI calculator to see how 1 stone loss might change your health status, and learn what options are available through the NHS or privately.
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.
UK Prescription Weight Management Options for 1 Stone Loss
If you're aiming to lose 1 stone through weight management in the UK, prescription medications are available for eligible adults. Three GLP-1 weight loss injections are currently licenced:
- Mounjaro (tirzepatide) — dual GIP/GLP-1 agonist, once weekly, with clinical trials showing average weight loss of 15–21% of body weight
- Wegovy (semaglutide) — GLP-1 agonist, once weekly, average weight loss approximately 15% in trials
- Saxenda (liraglutide) — GLP-1 agonist, daily injection, average weight loss around 5–10%
You're eligible for prescription weight loss UK if you have a BMI of 30 or above, or BMI 27–29.9 with weight-related health conditions like type 2 diabetes, high blood pressure, or sleep apnoea. For South Asian, Chinese, Black African, or Black Caribbean adults, lower thresholds apply (BMI 27.5+). All prescription medications work alongside reduced-calorie diet and increased physical activity — they are not replacements for lifestyle changes. Individual results vary significantly depending on dose, adherence, and personal factors.
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.
NHS vs Private Access and Next Steps
NHS weight loss medication is available through tier 3 specialist weight management services, typically accessed via GP referral. However, waiting lists in many areas can be substantial. Private prescription weight loss is available immediately through GPhC-registered online pharmacies following a clinical assessment with a UK-licensed prescriber — no NHS referral required.
To find out if you're eligible: use our free BMI calculator and GLP-1 weight loss calculator above to check your current status and project potential outcomes. Book a conversation with your GP to discuss weight management options, whether NHS or private. They can assess your health, review any medications you take, and advise which approach suits you. A 1 stone reduction is realistic with the right support — whether that's lifestyle alone or with prescription 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 kilograms and pounds?
1 stone = 6.35 kg (approximately) or 14 pounds exactly. So if you currently weigh 85 kg (13st 6lbs) and lose 1 stone, you'd weigh 79 kg (12st 6lbs). Use our free weight converter above to switch between any measurements instantly.
What health benefits can I expect from losing 1 stone?
Losing 1 stone can lower blood pressure, reduce type 2 diabetes risk, improve cholesterol levels, ease joint pain, and reduce sleep apnoea severity. Many people also report improved energy and mood. Benefits often appear before reaching an ideal BMI — even clinically studied weight loss brings measurable health improvements.
How long does it take to lose 1 stone safely?
The NHS recommends losing 0.5–1 kg per week for sustainable results. This means losing 1 stone (6.35 kg) would typically take 6–13 weeks with consistent effort. With prescription GLP-1 medication, weight loss may be faster, but individual results vary significantly.
Am I eligible for prescription weight loss medication on the NHS?
You may be eligible if you have a BMI of 30 or above, or BMI 27–29.9 with weight-related health conditions like diabetes or high blood pressure. NHS access requires referral to a tier 3 specialist weight management service through your GP. Waiting times vary significantly by region.
Can I access prescription weight loss medication privately without NHS referral?
Yes. Prescription weight loss medication (Mounjaro, Wegovy, or Saxenda) is available through private GPhC-registered pharmacies following a clinical assessment with a UK-licensed prescriber. This route is faster than NHS but involves out-of-pocket costs, typically £129–£320 per month depending on medication and dose.
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.