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 Measurement
A stone is the standard unit of weight measurement used in the UK for body weight. One stone equals exactly 14 pounds or approximately 6.35 kilograms. Understanding stone measurement is essential for UK adults managing their health, as the NHS provides weight guidance in kilograms but many people find stone more intuitive for tracking progress. Whether you're checking your healthy weight range or monitoring weight changes, knowing how to work with stone—alongside kg and pounds—gives you complete control over your health 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 Conversion and UK Health Context
Stone to kilogram conversion is straightforward: divide your weight in kilograms by 6.35029 to get stone, or multiply stone by 6.35029 to convert to kg. For practical purposes, 1 stone = 6.35 kg. For example, 70 kg equals approximately 11 stone 0.1 lbs. The NHS provides healthy weight guidance using both units—a healthy BMI (18.5 to 24.9) corresponds to specific weight ranges depending on your height. You can use our free weight converter above to instantly switch between stone, kilograms, and pounds. This matters because NHS health advice, GP consultations, and weight management programmes often reference different units, so understanding all three systems ensures you stay informed about your personal health targets.
- 1 stone = 14 pounds exactly
- 1 stone = 6.35 kg (approximate)
- UK adults typically use stone for body weight
- NHS uses kg for clinical measurements
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 Measurement Still Matters for UK Health
Although the metric system dominates internationally, stone remains deeply embedded in UK health culture. Doctors, dietitians, and weight management services often discuss weight in stone because it's how most UK adults understand their body. When you see "healthy weight" advice, NHS guidance on overweight and obesity, or weight loss calculator results, being fluent in stone measurement helps you translate recommendations into action. Our free BMI calculator above shows your personal BMI category and healthy weight range—you can view results in stone, kg, or pounds depending on what makes most sense for your UK health journey. Whether you're assessing weight-related health risks or tracking progress with weight management, stone measurement connects clinical health data to real-world understanding.
- 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 kilograms is one stone?
One stone equals approximately 6.35 kilograms exactly 6.35029 kg. To convert stone to kg, multiply the stone figure by 6.35. For example, 10 stone = 63.5 kg. To convert kg to stone, divide by 6.35—so 70 kg ÷ 6.35 = approximately 11 stone.
Why do UK people use stone instead of kilograms?
Stone is a traditional UK imperial measurement that has remained in everyday use for body weight, even as metric measurements became standard in healthcare. Most UK adults grew up thinking about their weight in stone, and the measurement remains culturally familiar. The NHS uses both units depending on context.
Is my weight healthy if I'm 11 stone?
Whether 11 stone (70 kg) is healthy depends on your height and age. Use our free BMI calculator on this page to check your personal BMI category instantly. For most adults, a healthy BMI is 18.5 to 24.9, though lower thresholds apply for South Asian, Chinese, Black African, and Black Caribbean individuals.
How do I convert stone and pounds to kilograms?
Multiply stone by 6.35, then add (pounds × 0.454). For example, 10 stone 7 pounds = (10 × 6.35) + (7 × 0.454) = 63.5 + 3.18 = 66.68 kg. Our weight converter above does this instantly for you.
What does the NHS say about healthy weight in stone?
The NHS recommends a healthy BMI of 18.5 to 24.9 for most adults. This translates to different stone ranges depending on your height. For example, at 5ft 8in (173cm), a healthy weight is roughly 8 stone 10 lbs to 11 stone 10 lbs. Your GP or our free BMI calculator can confirm your personal healthy range.
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.