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 Stones Conversion Chart for UK Adults
Converting kilograms to stones is essential for anyone tracking weight in the UK. Whether you're monitoring your health, interpreting NHS measurements, or simply checking your weight in familiar units, understanding how to convert kg to stone makes weight management clearer. This comprehensive conversion chart covers the typical adult weight range and explains why the UK uses both metric and imperial measurements in different contexts. Use the weight converter on this page to convert any weight instantly, or refer to the chart below for quick reference.
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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 Stones Conversion Table
Here's a comprehensive conversion table covering typical adult weights in the UK. Each kilogram equals approximately 0.157 stone, and each stone equals exactly 6.35 kilograms.
- 40 kg = 6st 4.8lbs
- 50 kg = 7st 12.8lbs
- 60 kg = 9st 6.4lbs
- 70 kg = 11st 0.1lbs
- 80 kg = 12st 8lbs
- 90 kg = 14st 2lbs
- 100 kg = 15st 10lbs
- 110 kg = 17st 4lbs
- 120 kg = 18st 13lbs
- 130 kg = 20st 7lbs
- 140 kg = 22st 1lbs
- 150 kg = 23st 8lbs
For precise conversions between these values, divide kilograms by 6.35 to get stone, or multiply by 2.205 to convert to pounds.
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 the UK Uses Both Metric and Imperial Measurements
The UK health system uses both units depending on context. The NHS records clinical measurements in kilograms for consistency with international standards and clinical calculations. However, UK adults typically think and speak about body weight in stone and pounds — a cultural preference that remains strong across the nation. Understanding both measurement systems is important because your GP may discuss weight targets in kg, whilst your bathroom scales might display stone. Our free BMI calculator above works with both units, making it easy to check your health status 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's the exact conversion formula from kg to stones?
Divide the kilogram value by 6.35029 to get stone. For example, 70 kg ÷ 6.35 = 11.02 stone. To convert kilograms to pounds, multiply by 2.20462. Most online converters round these values for practical use.
How do I convert kg to stone and pounds together?
First, divide kg by 6.35 to get the whole stone amount. Then take the decimal remainder, multiply by 14 (since one stone equals 14 pounds), and round. For 70 kg: 70 ÷ 6.35 = 11.02 stone, so 11 stone and (0.02 × 14) = 11 stone 0.3 pounds approximately.
Why does the UK use stone instead of just kilograms?
Stone has been used in the UK for centuries and remains culturally embedded. Whilst clinical settings use kilograms for accuracy and international compatibility, the general population continues using stone because it's familiar and convenient. Both systems remain in common use across the NHS and everyday life.
Is there a quick way to estimate kg to stone without a calculator?
Rough approximation: divide kg by 6.4 (easier than 6.35 mentally). For example, 70 kg ÷ 6.4 ≈ 11 stone. This isn't precise but useful for quick estimates. For exact conversions, use our weight converter tool above.
How does my weight in kg affect my BMI and health category?
Your BMI depends on both weight (kg) and height. Use our free BMI calculator to instantly see your personal BMI category (healthy, overweight, obese) based on NHS guidelines. The same weight in kg translates the same way regardless of whether you express it as stone — the health implications remain identical.
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.