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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Kilo to Stone — How to Convert kg to Stone in the UK
Converting kilograms to stone is straightforward once you know the UK conversion formula. In the UK, we typically measure body weight in stone and pounds, whilst most of Europe and clinical settings use kilograms. Understanding how to convert between kilo and stone is essential for reading NHS health guidance, using weight charts, and tracking your progress. Whether you're checking your BMI, following a weight management programme, or simply curious about your weight in UK measurements, this guide explains the exact conversion and provides practical context for your health.
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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.
How to Convert Kilo to Stone — The Formula
The exact conversion formula is straightforward: divide the kilogram value by 6.35029 to get stone. For example, 70kg ÷ 6.35029 = 11.03 stone, which equals 11 stone and 0.4 pounds. Conversely, to convert stone to kilograms, multiply by 6.35029.
- 1 kilogram = 0.157473 stone
- 1 stone = 6.35029 kilograms
- 1 stone also equals exactly 14 pounds
Use our free weight converter above to convert any kilo value to stone and pounds instantly. This is especially useful when you're reading NHS guidance (which uses kg) but prefer to see your weight in stone, the standard measurement for most UK adults. The converter also helps you understand your BMI more clearly by showing your weight in familiar UK 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 Health Context — Why This Matters for Your Health
The NHS uses kilograms for clinical measurements, but understanding your weight in stone helps you relate to UK health guidance more easily. For instance, if your NHS letter states you weigh 80kg, converting to stone (12st 8lbs) makes the figure more relatable. NHS guidance on healthy weight ranges is typically given in BMI, which applies across all units—a healthy BMI is 18.5 to 24.9 regardless of whether you measure in kg or stone.
- Calculate your personal BMI using our free BMI calculator to see whether your weight is in the healthy range for your height
- Reference NHS growth charts for children, which use kg but often include stone conversions
- Track your weight loss progress in units you find motivating—many people prefer stone for long-term tracking
- 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 formula to convert kilo to stone?
Divide kilograms by 6.35029 to get stone. For example, 75kg ÷ 6.35029 = 11.82 stone (or 11 stone 11.5 pounds). You can also multiply stone by 6.35029 to convert back to kilograms. Use our free weight converter above for instant conversions.
Is 70kg considered a healthy weight in the UK?
Whether 70kg is healthy depends on your height and age. Use our free BMI calculator to find out your personal BMI. For most adults, 70kg falls within a healthy range if you're around 5ft 7in to 5ft 9in tall. Your GP can advise whether 70kg is healthy for your individual circumstances.
Why do UK health services use both kg and stone?
NHS clinical systems use kilograms for consistency with international standards and medical records. However, UK patients often think in stone because it's the traditional British measurement. That's why NHS letters often include both units, and our weight converter helps you switch between them easily.
How does kilo to stone conversion affect BMI calculations?
BMI calculations are identical regardless of units used—the ratio of weight to height squared stays the same. A BMI of 30 using kilograms and metres is the same as a BMI of 30 using pounds and inches. Our free BMI calculator above accepts both metric and imperial measurements for convenience.
Should I track my weight loss in kilos or stone?
Choose whichever unit you find most motivating. Some people prefer kilos because changes are more visible (0.5kg loss vs 1lb loss looks more impressive). Others prefer stone for longer-term tracking. Our free progress tracker lets you log in either unit and track your journey over time.
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.