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
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How to Convert Stone to Kg — UK Weight Guide
Converting stone to kilograms is straightforward using a simple formula: divide the weight in stone by 0.157473, or multiply by 6.35029. In the UK, we commonly use stone and pounds for body weight, while kilograms are the standard clinical measurement used by the NHS. Understanding both units helps you navigate health information, fitness goals, and medical appointments. Our free weight converter above makes instant conversions effortless, and you can use this guide as a reference whenever you need to switch between these measurements.
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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 Kg Conversion Table — Full Reference
The most reliable way to convert stone to kg is using the exact conversion factor: 1 stone = 6.35029 kilograms. To convert any weight in stone to kg, multiply the stone value by 6.35029. For example, 11 stone × 6.35029 = 69.85 kg. Below is a comprehensive conversion table covering the typical adult weight range in the UK:
- 7 stone = 44.5 kg
- 8 stone = 50.8 kg
- 9 stone = 57.2 kg
- 10 stone = 63.5 kg
- 11 stone = 69.8 kg
- 12 stone = 76.2 kg
- 13 stone = 82.6 kg
- 14 stone = 88.9 kg
- 15 stone = 95.3 kg
- 16 stone = 101.6 kg
- 17 stone = 108.0 kg
- 18 stone = 114.3 kg
- 19 stone = 120.7 kg
- 20 stone = 127.0 kg
For mixed weights (stone and pounds), first convert the pounds to decimal stone (divide pounds by 14), then add to the whole stones before multiplying by 6.35029. Try our weight converter tool above for instant calculations across all metric and imperial units.
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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.
UK Weight Measurements — When Stone and Kg Are Used
In the UK, stone is the cultural standard for everyday body weight — you'll hear people say "I weigh 12 stone" in conversation, on bathroom scales, and in fashion sizing. However, kilograms are the NHS clinical standard used in medical records, health assessments, and clinical guidelines. When you visit your GP or access NHS health information, your weight will typically be recorded in kg. Understanding both units means you can confidently interpret your health data across different contexts. Use our BMI calculator above to check your healthy weight range — it works with both kg and stone, helping you stay informed about your health regardless of which measurement you prefer.
- 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.
What is the exact conversion from stone to kg?
The exact conversion factor is 1 stone = 6.35029 kg. To convert any weight in stone to kilograms, multiply the stone value by 6.35029. For example, 10 stone = 63.5 kg. For mixed weights like 10 stone 7 pounds, convert the pounds to decimal first (7 ÷ 14 = 0.5), then multiply (10.5 × 6.35029 = 66.7 kg).
Why does the UK use stone for weight instead of kg?
Stone is deeply embedded in British culture and imperial measurement tradition. Most UK adults grew up using stone and pounds, and it remains the informal standard for body weight in everyday conversation. However, the NHS uses kilograms clinically for consistency with international medical standards and because kg is more precise for small adjustments in medical contexts.
Is stone to kg conversion the same as stone to pounds?
No — they're different conversions. Stone to kg converts between imperial (stone) and metric (kilogram). Stone to pounds stays within imperial: 1 stone = 14 pounds exactly. If you need to convert kg to pounds, you'd use the factor 1 kg = 2.20462 lbs. Our weight converter handles all three unit conversions instantly.
How do I convert stone and pounds to kg together?
First, convert the pounds to a decimal fraction of stone by dividing by 14 (since 1 stone = 14 pounds). For example, 10 stone 8 pounds = 10 + (8 ÷ 14) = 10.57 stone. Then multiply by 6.35029: 10.57 × 6.35029 = 67.1 kg. The weight converter above handles this calculation automatically.
Does the NHS use stone or kg for health assessments?
The NHS uses kilograms as the official clinical measurement for medical records, BMI calculations, and health assessments. However, your GP may discuss weight with you in stone if that's your preference. BMI thresholds and healthy weight ranges are defined in kg, though our BMI calculator works with both units for your convenience.
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.