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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NHS Weight Conversion Chart: Kg to Stone
Converting kilograms to stone is straightforward using the standard conversion formula, but understanding where your weight sits within NHS health guidance is equally important. This NHS weight conversion chart helps UK adults convert between metric and imperial measurements and check their weight against NHS healthy weight ranges and BMI categories. Whether you're tracking progress or simply need to understand your weight in familiar UK terms, we've covered everything you need to know.
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.
Quick Kg to Stone Conversion Reference Table
Use this comprehensive conversion table to convert kilograms to stone and pounds instantly:
- 50 kg = 7 stone 12.8 lbs (BMI context: underweight to healthy depending on height)
- 60 kg = 9 stone 6.4 lbs (typically healthy weight for shorter adults)
- 70 kg = 11 stone 0.1 lbs (average UK adult weight, BMI depends on height)
- 80 kg = 12 stone 8 lbs (overweight category for most adults)
- 90 kg = 14 stone 2 lbs (obese range for most heights)
- 100 kg = 15 stone 10 lbs (obese range)
- 110 kg = 17 stone 4 lbs (severely obese for most adults)
The conversion formula is simple: divide kilograms by 6.35029 to get stone. Use our free weight converter above for instant conversions at any weight.
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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.
Understanding Your Weight in NHS Health Context
Simply converting your weight to stone is only part of the picture. NHS guidance uses BMI (body mass index) alongside weight measurements to assess health risk. A weight of 70 kg might be healthy for someone 180 cm tall, but overweight for someone 160 cm tall. This is why height matters. Use our free BMI calculator above to enter your weight and height and see exactly where you fall on the NHS healthy weight scale. The NHS also recommends measuring your waist circumference: healthy ranges are under 94 cm for men and under 80 cm for women. For adults of South Asian, Black African, Black Caribbean, or Chinese heritage, NHS guidance recommends slightly lower thresholds for health risk assessment.
- 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 formula to convert kg to stone?
Divide kilograms by 6.35029 to get stone. For example: 70 kg ÷ 6.35029 = 11.03 stone (11 stone 0.4 lbs). Our weight converter above does this instantly for any weight.
What weight is considered healthy according to NHS guidance?
NHS healthy weight is typically a BMI of 18.5 to 24.9. The actual weight depends on your height. For example, a healthy weight for someone 170 cm tall is roughly 53–71 kg (8 stone 5 lbs to 11 stone 2 lbs). Use the BMI calculator above to check your personal healthy range.
Is my weight healthy if I'm 80 kg?
This depends entirely on your height. At 80 kg, someone 180 cm tall would have a BMI of approximately 24.7 (healthy), while someone 160 cm tall would have a BMI of approximately 31.3 (obese). Always check your BMI using your actual height for accurate NHS health guidance.
How do I convert stone and pounds to kg?
Multiply stone by 6.35029 and pounds by 0.453592, then add them together. For example: 11 stone 2 lbs = (11 × 6.35029) + (2 × 0.453592) = 70.4 kg. Our weight converter handles this automatically.
Why does NHS guidance recommend different weight thresholds for some ethnic groups?
Research shows that people of South Asian, Black African, Black Caribbean, and Chinese heritage have higher health risks at the same BMI compared to European populations. The NHS therefore recommends lower BMI thresholds (starting at 23 for overweight instead of 25) for these groups to better reflect their individual health risk.
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.