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
Free tracker included with every download this week
Weight Chart: Stone to Kg Conversion Guide
Converting your weight from stone to kilograms is straightforward using the standard conversion formula. One stone equals exactly 6.35 kilograms, so you can multiply any stone weight by this figure to get the metric equivalent. Whether you're tracking your weight for health management, understanding NHS health advice, or simply comparing measurements, our free weight converter on this page makes the calculation instant. This guide explains the conversions and shows how your weight relates to healthy weight ranges according to UK health guidance.
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.
Common Stone to Kilogram Conversions
Quick conversion formula: Stone × 6.35029 = kilograms. For example, 10 stone = 63.5 kg, 12 stone = 76.2 kg, and 15 stone = 95.3 kg. Most UK adults use stone and pounds for everyday weight, whilst the NHS and GPs use kilograms for clinical measurements and health records.
- 8 stone = 50.8 kg
- 10 stone = 63.5 kg
- 12 stone = 76.2 kg
- 14 stone = 88.8 kg
- 16 stone = 101.6 kg
Use our BMI calculator to see how your weight in kg relates to your BMI and whether it falls within the healthy weight UK range for your height. The NHS healthy weight range for adults is a BMI of 18.5 to 24.9, though these thresholds are lower for South Asian, Chinese, Black African, and Black Caribbean adults.
Clinically BackedWeight Loss
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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.
Why Weight Conversion Matters for Health
Understanding your weight in both stone and kilograms is useful for comparing health data with your GP, reading NHS guidance, and tracking weight management progress. Medical records and prescription weight loss medications are discussed in kilograms, whilst many UK diet programmes and personal scales still display stone. Our free weight converter tool above lets you switch between units instantly.
Healthy weight context: At any given height, there's a healthy kg range according to NHS guidance. For example, if you're 5ft 8in (173 cm), your healthy weight range is approximately 55–74 kg (8st 10lbs to 11st 10lbs). If you're considering weight management options, understanding your current weight in kg helps you and your GP assess whether prescription options or lifestyle changes are most appropriate for you.
- 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 kg?
One stone = 6.35029 kilograms exactly. To convert any weight in stone to kg, multiply the stone value by 6.35. For example, 12 stone × 6.35 = 76.2 kg. You can also use our free weight converter above for instant calculations across stone, pounds, and kilograms.
Why do the NHS use kg instead of stone?
The NHS uses kilograms because it's the international medical standard and makes clinical calculations more accurate. Stone and pounds are primarily a UK tradition. Your GP's records will show your weight in kg, so understanding both measurements helps you follow health advice and track progress effectively.
How does my weight in kg relate to BMI?
Your BMI is calculated using your weight in kilograms divided by your height in metres squared. Our free BMI calculator on this page instantly shows your BMI and whether it falls within the NHS healthy weight range. A healthy BMI is 18.5–24.9 for most UK adults, with lower thresholds for some ethnic backgrounds.
What's the healthy weight range in kg for UK adults?
This depends on your height. For example, at 5ft 6in (168 cm), a healthy weight is roughly 50–67 kg. At 5ft 10in (178 cm), it's roughly 57–76 kg. Use our BMI calculator to find your personal healthy weight range — it accounts for your exact height and shows the kg values instantly.
Can I use this weight chart for weight loss tracking?
Yes, many people track weight loss in kilograms because it shows smaller incremental changes than stone. If you're using weight loss medication like GLP-1 injections, your prescriber will discuss results in kg. Our free progress tracker lets you log your weight in either unit and track changes 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.