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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Convert Kg To Stone Using NHS Guidelines
Converting kilograms to stone is straightforward using the standard conversion rate of 1 stone = 6.35029 kg. In the UK, stone and pounds remain the most common way adults discuss body weight, even though the NHS uses kilograms for clinical measurements and health records. This guide shows you how to convert kg to stone accurately, plus what your weight means for your health according to NHS guidelines. Use our free weight converter above to convert instantly between metric and imperial units.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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 Table
To convert kg to stone, divide the kilogram value by 6.35029. For example, 70kg ÷ 6.35029 = 11 stone (approximately). The formula works for any weight: simply take your kg value and divide by the conversion factor. Below is a comprehensive reference table covering typical adult weight ranges in the UK:
- 40kg = 6st 5lbs
- 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 8lbs
For faster conversions, use our weight unit converter tool on this page — it handles stone pounds kg conversions instantly across all common UK weight measurements.
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 Stone Is Used In The UK And When NHS Uses Kilograms
The UK is unique in using stone as the primary unit for body weight in everyday conversation, despite being officially metric in most other areas. The NHS and all clinical settings use kilograms for medical records, BMI calculations, and health guidance — this is why your GP will always refer to your weight in kg. However, most UK adults still think about and discuss their weight in stone and pounds (lbs). Understanding both systems helps you interpret health advice effectively. When reading NHS weight guidance or BMI recommendations, remember that metric imperial conversion between these systems is essential for context. Our BMI calculator on this page automatically handles both units, showing you where your weight falls on NHS healthy weight guidelines 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 formula to convert kg to stone?
Divide kilograms by 6.35029 to get stone. For example, 80kg ÷ 6.35029 = 12.6 stone (12 stone 8 lbs). You can also multiply stone by 6.35029 to convert back to kg. The weight converter tool on this page does this instantly.
How do I convert kg to stone and pounds together?
First convert kg to stone by dividing by 6.35029. The whole number is your stone; multiply the decimal by 14 to get pounds. For 75kg: 75 ÷ 6.35 = 11.81 stone = 11 stone + (0.81 × 14) = 11 stone 11 lbs approximately.
What does NHS say about healthy weight in stone?
NHS recommends a BMI of 18.5 to 24.9 for adults. For a 5ft 8in person, this equals approximately 8st 10lbs to 11st 10lbs. Use our free BMI calculator above to find your healthy weight range for your specific height.
Why does the NHS use kg if the UK uses stone?
The NHS uses kilograms because it's the international standard for clinical measurement, ensuring accuracy and consistency with global health data. However, your GP will translate this into stone for you when discussing your weight informally.
Can I use this kg stone conversion for children's weight?
No — children's weight assessment uses different criteria based on age and sex-specific growth charts, not adult BMI categories. Always discuss your child's weight with your GP or health visitor using NHS growth reference charts designed for their age.
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.