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 a Stone? Understanding UK Weight Measurements
A stone is a unit of weight used primarily in the UK and Ireland. One stone equals exactly 14 pounds or approximately 6.35 kilograms. Despite the UK's official adoption of metric measurements, stone remains the preferred way most British adults describe their body weight in everyday life. Whether you're checking your health at the GP's surgery or tracking your weight for fitness, understanding how stone works is essential for navigating UK health guidance and NHS information.
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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.
Stone to Kilogram and Pound Conversions
One stone = 14 pounds (exactly)
One stone = 6.35029 kilograms (approximately)
To convert stone to kilograms, multiply the number of stone by 6.35. For example, 10 stone × 6.35 = 63.5 kg. To convert stone to pounds, multiply by 14 — so 10 stone = 140 pounds. Conversely, to find stone from kilograms, divide by 6.35. If you weigh 70 kg, that's 70 ÷ 6.35 = 11 stone (approximately). Use our free weight converter to switch instantly between stone, kilograms, and pounds. This is particularly useful when reading NHS health guidance, which often uses kilograms, while your GP or scales at home may display stone and pounds.
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.
Why Stone Remains Popular in UK Health
Although the UK officially converted to metric measurements in the 1970s, stone has remained deeply embedded in British culture and healthcare. Most UK adults naturally think of their weight in stone rather than kilograms. NHS weight management services, GP practices, and weight loss information often present data in both stone and kilograms to accommodate this preference. Understanding your weight in stone helps you engage more naturally with healthy weight ranges, BMI categories, and weight loss targets discussed with healthcare professionals. Calculate your BMI using our free BMI calculator above to see how your weight in stone relates to your health category according to NHS guidelines.
- 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 many pounds are in one stone?
One stone equals exactly 14 pounds. This is a fixed, unchanging conversion. So if you weigh 12 stone, that's 12 × 14 = 168 pounds. It's a straightforward multiplication.
What is one stone in kilograms?
One stone equals approximately 6.35 kilograms. The exact figure is 6.35029 kg. To convert any weight in stone to kilograms, multiply the stone value by 6.35. For example, 8 stone = 8 × 6.35 = 50.8 kg approximately.
Why does the UK still use stone if it's metric?
Despite the UK officially adopting metric measurements decades ago, stone persisted in everyday use, particularly for body weight. It remains culturally familiar to British adults and is still widely used by GPs, healthcare services, and fitness professionals. NHS health guidance typically presents weight in both stone and kilograms for clarity.
How do I convert kilograms to stone?
Divide kilograms by 6.35 to get stone. For example, 70 kg ÷ 6.35 = 11 stone (approximately). Our free weight converter tool can do this instantly for any value. This is helpful when NHS guidance gives weight thresholds in kilograms but you think in stone.
What's a healthy weight in stone for UK adults?
According to NHS guidelines, a healthy BMI is 18.5 to 24.9. This translates to different stone weights depending on your height. For example, at 5ft 8in, a healthy weight range is roughly 8st 10lbs to 11st 10lbs. Use our BMI calculator to find your personal healthy weight range in stone based on your exact height.
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.