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 Stones and Pounds to Kilograms — NHS Guide
Converting between stones, pounds, and kilograms is straightforward once you know the formula—and it's essential for understanding UK health advice. The NHS uses kilograms for clinical measurements, but many UK adults prefer thinking about weight in stone and pounds. This guide shows you exactly how to convert your weight to kg and what your result means for your health according to NHS guidance.
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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 Stones and Pounds to Kilograms
The conversion formulas are simple and reliable. To convert stones to kilograms, multiply your stone weight by 6.35029. To convert pounds to kilograms, multiply by 0.453592. If you have both stones and pounds—for example, 11 stone 8 pounds—convert each part separately then add them together.
Example: 11 stone 8 pounds = (11 × 6.35029) + (8 × 0.453592) = 69.85 + 3.63 = 73.48 kg.
For quick conversions, use our free weight converter above—it handles the maths instantly and works in both directions. You can also check your BMI calculator to see whether your weight in kg falls within the healthy range according to NHS health thresholds, regardless of which unit you prefer.
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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 NHS Health Advice Uses Kilograms
The NHS records weight in kilograms because it's the standard unit across UK health services and aligns with international medical practice. When your GP records your weight or calculates your BMI, they use kg. Understanding your weight in both units—stone and kg—means you can easily follow NHS health guidance and track your weight using whichever measurement feels most natural to you.
Most UK weight management programmes, including NHS guidance on healthy weight ranges, reference kg when discussing clinical thresholds. Converting your personal weight to kg ensures you can accurately compare it against NHS health advice and make informed decisions about your wellbeing.
- 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 10 stone in kilograms?
10 stone equals approximately 63.5 kg. Use the formula: 10 × 6.35029 = 63.50 kg. For quick conversions between multiple stone and pound combinations, our free weight converter above handles all the calculations instantly.
How do I convert 9 stone 7 pounds to kg?
Convert each part separately: 9 stone = 57.15 kg, and 7 pounds = 3.18 kg. Add them together: 57.15 + 3.18 = 60.33 kg. This approach works for any combination of stones and pounds you need to convert.
Is my weight in kg within the NHS healthy range?
The NHS considers a healthy BMI (which uses weight and height in kg and metres) to be between 18.5 and 24.9. Once you've converted your weight to kg, use our free BMI calculator above with your height to see exactly where you fall on the NHS health scale.
Why does the NHS use kilograms instead of stones?
Kilograms are the standard unit across all UK health services and international medicine, making it easier to record, compare, and track health data. When your GP discusses your weight or health metrics, using kg ensures consistency with NHS guidance and global health standards.
Can I use this conversion for NHS weight management programmes?
Yes, absolutely. Converting your weight to kg using this formula ensures you can accurately follow NHS health advice, check your BMI against NHS thresholds, and participate in weight management programmes that reference kilogram measurements. Our free conversion tools help you track your weight consistently.
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.