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 and Pounds — NHS Calculator Guide
Converting kilograms to stone and pounds is essential for understanding your weight in UK measurements. The NHS uses kilograms clinically, but most UK adults think in stone and pounds. This guide explains the exact conversion formula, provides a comprehensive reference table covering typical adult weights, and helps you understand why the NHS and UK culture use different measurement systems. Use our free weight converter above for instant conversions, or follow this step-by-step guide.
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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.
Complete Kg to Stone and Pounds Conversion Table
The exact conversion formula is straightforward: divide kilograms by 6.35029 to get stone. For example, 70kg ÷ 6.35029 = 11.04 stone (or 11 stone 0.6 pounds). To convert the decimal into pounds, multiply the decimal portion by 14 — since 1 stone equals exactly 14 pounds. Below is a complete reference table covering weights from 40kg to 150kg, showing the stone and pounds equivalent for each value. This table covers the typical range of UK adult weights and makes it easy to find your weight or compare values without calculation:
- 40kg = 6st 4.5lbs
- 50kg = 7st 12.8lbs
- 60kg = 9st 6.4lbs
- 70kg = 11st 0.1lbs
- 80kg = 12st 8lbs
- 90kg = 14st 2lbs
- 100kg = 15st 10.2lbs
- 110kg = 17st 4.2lbs
- 120kg = 18st 12.2lbs
- 130kg = 20st 6.2lbs
- 140kg = 22st 0.2lbs
- 150kg = 23st 8.2lbs
Use our free BMI calculator above alongside this conversion table to understand not just your weight in UK units, but also whether your weight falls within a healthy range for your height according to NHS guidelines.
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 UK Healthcare Uses Two Measurement Systems
The NHS uses kilograms (kg) for all clinical measurements and health records — this aligns UK healthcare with international medical standards and makes research comparable globally. However, most UK adults grew up using stone and pounds, so these remain culturally familiar. Your GP's practice will record your weight in kg on your medical record, but you'll naturally think of yourself in stone. The NHS BMI calculator accepts both units, recognising that UK adults prefer stone and pounds for personal weight conversations. Understanding both systems ensures you can communicate effectively with your healthcare team whilst staying connected to measurements that feel natural to you. If you need to discuss your weight with your GP, knowing both values prevents confusion.
- 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 and pounds?
Divide kilograms by 6.35029 to get stone. To convert the decimal portion to pounds, multiply by 14 (since 1 stone = 14 pounds exactly). For example: 70kg ÷ 6.35029 = 11.04 stone = 11 stone and 0.56 pounds. Most people round this to 11 stone 0 or 11 stone 1 pound in everyday conversation.
Why does the NHS use kilograms instead of stone?
The NHS uses kilograms for clinical consistency with international medical standards. This ensures UK health records are compatible with global research and other healthcare systems. However, the NHS recognises UK adults prefer stone, so most NHS calculators and patient-facing tools accept both units.
Is there a quick way to estimate kg to stone without a calculator?
A rough approximation: 1 stone ≈ 6.3 or 6.4 kg. So to estimate, divide your kg by 6 (slightly less accurate but close). For example, 72kg ÷ 6 ≈ 12 stone. For precision, use our free weight converter above which calculates the exact stone and pounds instantly.
What weight range is considered healthy according to NHS guidelines?
According to the NHS, a healthy BMI is 18.5 to 24.9. For most UK adults, this translates to roughly 55kg to 85kg (or 8st 9lbs to 13st 5lbs) depending on height. Use our BMI calculator on this page to check if your personal weight is healthy for your specific height.
Should I track my weight in kg or stone and pounds?
Track in whichever unit feels most natural to you for consistency. If you use our free progress tracker on MyWeightCheck, it accepts both units, so you can log in stone one week and kg the next. For medical appointments, knowing your weight in kg is useful since that's what your GP records clinically.
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.