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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Converting Kilograms to Stone: Your UK Weight Guide
In the UK, we use stone and pounds to measure body weight, even though kilograms are standard in healthcare settings. Understanding how to convert kg to stone is essential for interpreting your NHS health guidance, comparing your weight to UK statistics, and tracking your progress. This guide explains the conversion, shows you practical examples, and helps you understand what your weight means for your health using NHS standards.
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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 Kg to Stone Accurately
The conversion from kilograms to stone is straightforward: divide your weight in kg by 6.35029. One stone equals exactly 6.35029 kilograms, making this a simple mathematical relationship. For example, 70 kg divided by 6.35029 equals 11.02 stone, which is 11 stone and 0.1 pounds. You can also convert to pounds directly: multiply kg by 2.20462 to get the exact weight in pounds, then divide by 14 to find the stone equivalent.
For practical UK health information, you'll find that NHS guidance often references weight in kilograms for clinical purposes (BMI calculations, medication dosing, health thresholds), but most UK adults still think about their weight in stone and pounds. Our free weight converter above lets you switch between units instantly — just enter your weight in kg and see the stone equivalent immediately, plus your BMI category according to NHS standards.
- 70 kg = 11 stone 0.1 lbs
- 80 kg = 12 stone 8 lbs
- 90 kg = 14 stone 2 lbs
- 100 kg = 15 stone 10 lbs
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.
Understanding Your Weight in the Context of UK Health Guidance
Once you've converted your weight to stone, the next step is understanding whether it's in a healthy range according to NHS guidance. The NHS recommends a healthy BMI of 18.5 to 24.9 for most UK adults, which corresponds to specific weight ranges depending on your height. For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS suggests lower thresholds (BMI 18.5 to 22.9) because these groups face higher health risks at the same weight levels.
Use our free BMI calculator on this page to find your personal healthy weight range in both stone and kilograms. If your weight is outside the healthy range, your GP can offer advice tailored to your circumstances. Even modest weight loss of 5–10% of your body weight can bring real health benefits, including improved blood pressure, better blood sugar control, and reduced joint strain.
- 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 kg to stone conversion formula?
Divide your weight in kilograms by 6.35029 to get stone. For example, 70 kg ÷ 6.35029 = 11.02 stone (11 stone and 0.1 lbs). You can also multiply kg by 2.20462 to get pounds, then divide by 14 to convert to stone. Our free weight converter does this instantly.
Why does the NHS use kg when UK adults think in stone?
The NHS uses kilograms for clinical consistency across Europe and internationally. However, the NHS recognises that UK adults are most comfortable with stone and pounds, so health advice is often presented in both units. Understanding both measurements helps you engage fully with your health data.
Is there a healthy weight range for my height in stone?
Yes. For a healthy BMI (18.5–24.9), calculate: (18.5 × height in metres²) to (24.9 × height in metres²) and convert to stone. For example, at 5ft 8in (1.73m), healthy weight is approximately 8st 10lbs to 11st 10lbs. Use our free BMI calculator above to find your exact range.
How does my weight in kg compare to the average UK adult?
The average UK adult man weighs about 85.7 kg (13st 7lbs) with a BMI around 27.9 (overweight). The average woman weighs 71.6 kg (11st 3lbs) with a BMI around 27.4. Around 63% of UK adults are overweight or obese, so understanding your personal weight status is important for your health.
Should I be concerned if my kg weight seems high compared to stone?
The number appears higher in kg because the unit is smaller. 100 kg might sound high, but it's only 15st 10lbs in UK measurements. What matters is your BMI and health context, not the absolute number. Your GP can advise whether your weight is healthy for your individual circumstances.
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.