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 Kilograms — UK Guide
Converting between stone and kilograms is straightforward using a simple formula. In the UK, we typically measure body weight in stone and pounds, but healthcare professionals and many online health tools use kilograms. Understanding this conversion helps you access NHS guidance and use health calculators effectively. This guide explains the exact conversion formula, provides quick reference values, and shows how weight measurements fit into UK health recommendations.
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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 Formula
The exact conversion formula is: multiply stone by 6.35029 to get kilograms, or divide kilograms by 6.35029 to get stone. For practical purposes, you can use 6.35 as your multiplier. One stone equals precisely 6.35029 kg, and one kilogram equals 0.157473 stone.
- Stone to kg: stone × 6.35029 = kg (e.g., 11 stone × 6.35029 = 69.85 kg)
- Kg to stone: kg ÷ 6.35029 = stone (e.g., 70 kg ÷ 6.35029 = 11.03 stone)
- Why the difference? The UK uses stone for body weight, while NHS clinical guidance and most online health information systems use kilograms as standard
Use our free weight converter above to instantly convert any weight between stone, kilograms, and pounds without a UK pharmacy calculation.
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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 Health Context and NHS Guidance
NHS health professionals record weight in kilograms for clinical assessments and health records. Understanding kg measurements helps you engage with NHS guidance, participate in weight management programmes, and use health calculators accurately. A healthy BMI range is the same regardless of units — whether you measure in stone or kilograms, the NHS recommends a BMI between 18.5 and 24.9 for most adults (lower thresholds apply for South Asian, Chinese, Black African, and Black Caribbean heritage).
Calculate your personal BMI using the free BMI calculator on this page, then use your result to understand your health context according to NHS guidance. Your GP can provide personalised advice about what your weight means for your individual health.
Convert your weight between stone, kilograms, and pounds instantly using the free weight converter above. This guide explains the exact conversion formula, provides quick reference values, and shows how weight measurements fit into UK health recommendations.
- 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's the exact conversion from stone to kilograms?
One stone equals exactly 6.35029 kilograms. To convert, multiply stone by 6.35029. For example, 11 stone equals approximately 69.85 kg. For reverse conversion, divide kilograms by 6.35029. You can use our free weight converter for instant conversions without a UK pharmacy calculation.
Why does the NHS use kilograms instead of stone?
Kilograms are the international standard for medical measurements, used across NHS systems and clinical guidelines. This allows consistent health data recording and comparisons with international health standards. However, most UK adults still think and communicate in stone for body weight, which is why understanding both measurements is useful.
How does stone weight relate to a healthy BMI?
Your healthy weight range depends on your height and applies equally whether measured in stone or kilograms. The NHS BMI calculator uses your weight and height to determine your category. For example, a 5ft 8in adult has a healthy weight range of approximately 8st 10lbs to 11st 10lbs (55–75 kg). Use our free BMI calculator to find your personal healthy range.
Is there a quick way to estimate stone to kilogram conversion without a calculator?
A rough approximation: one stone ≈ 6.4 kg. So 10 stone ≈ 64 kg, and 15 stone ≈ 96 kg. However, for health-related decisions, use precise conversions. Our free weight converter provides exact values instantly.
What weight measurements do weight loss programmes use in the UK?
UK weight management programmes and NHS services may use either stone or kilograms depending on the tool or provider. Many online health calculators use kilograms, while community programmes often track progress in stone. Both units track identical progress — the choice is simply preference. Use our free progress tracker to log your weight in whichever unit you prefer. ```
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.