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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Kg to Stone Chart — UK Weight Conversion Guide
Converting kilograms to stone is essential in the UK, where stone and pounds remain the standard way to measure body weight. Unlike most of Europe which uses metric exclusively, UK adults typically discuss weight in stone and pounds — even though the NHS uses kilograms clinically. This chart covers the full range of typical adult weights from 40kg to 150kg, showing the exact stone and pounds equivalent for each kilogram value. Whether you're checking your BMI, tracking weight loss, or simply understanding a clinical measurement, having a reliable kg to stone conversion chart makes the process instant and accurate.
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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.
Complete Kg to Stone Conversion Chart (40–150kg)
Here is the complete conversion chart covering typical UK adult weight ranges. Each kilogram value converts using the standard formula: 1 kg = 0.157473 stone, or inversely, 1 stone = 6.35029 kg.
- 40kg = 6st 4.8lbs
- 50kg = 7st 12.8lbs
- 60kg = 9st 6.4lbs
- 70kg = 11st 0.1lbs
- 80kg = 12st 8lbs
- 90kg = 14st 2lbs
- 100kg = 15st 10lbs
- 110kg = 17st 4lbs
- 120kg = 18st 13lbs
- 130kg = 20st 7lbs
- 140kg = 22st 1lbs
- 150kg = 23st 9lbs
For precise conversions between these values, use our free weight converter on this page to convert any kilogram amount instantly. The metric imperial conversion is straightforward once you know the conversion factor — but our tool removes any calculation uncertainty.
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.
UK Measurement Context — Why Stone and Kg Coexist
The UK uses both stone and kilograms depending on context. Clinically, the NHS records weight in kilograms for medical accuracy and international consistency. Personally, UK adults still prefer stone and pounds — it's deeply embedded in British culture, from fashion sizing to diet programmes to casual conversation. This dual-unit system can be confusing, but it's simply a reflection of how UK health measurement has evolved. Your GP may discuss your weight in kilograms at an appointment, but you'll likely think of your own weight in stone and pounds. Understanding both units helps you navigate healthcare conversations confidently. Try our free BMI calculator above to see how your weight in any unit converts to a health context instantly.
- 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 factor from kilograms to stone?
The exact conversion is 1 kilogram = 0.157473 stone, or 1 stone = 6.35029 kilograms. To convert any kilogram amount to stone, divide the kg by 6.35029. For example, 70kg ÷ 6.35029 = 11.03 stone (which equals 11 stone 0.4 pounds). Our free weight converter calculates this instantly.
Why do UK adults still use stone and pounds instead of kilograms?
Stone and pounds are traditionally embedded in British culture and everyday language. Most UK adults grew up measuring body weight in stone, and it remains the preferred casual measurement. The NHS uses kilograms clinically for medical consistency and international standards, but UK patients often convert these to stone to understand their weight in familiar terms.
How do I convert stone and pounds back to kilograms?
To convert stone and pounds to kilograms, multiply the stone amount by 6.35029, then add (pounds × 0.453592). For example: 11 stone 0 pounds = (11 × 6.35029) + (0 × 0.453592) = 69.85 kg. Use our weight unit converter for instant conversions without a UK pharmacy calculation.
Is the kg to stone conversion accurate for clinical weight measurements?
Yes, the conversion is mathematically precise and used by UK healthcare providers. When your GP records your weight in kilograms, you can confidently convert it to stone using this chart or our converter. However, remember that weight fluctuates daily by up to 1–2kg depending on hydration, meals, and time of day.
What weight range is considered healthy according to NHS guidelines?
According to NHS guidance, a healthy BMI is 18.5 to 24.9, which corresponds to approximately 8st 7lbs to 11st 3lbs for someone of average height (5ft 5in). However, healthy weight ranges vary by height and ethnicity. Use our free BMI calculator above to determine your personal healthy weight range based on your 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.