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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How To Convert Kg To Stones And Pounds In The UK
Converting kilograms to stones and pounds is straightforward once you know the formula. In the UK, weight is measured in stone and pounds, whilst clinical settings like the NHS use kilograms. This guide explains the exact conversions and provides a comprehensive reference table so you can instantly convert any adult weight between metric and imperial measurements. Understanding both systems is particularly useful when discussing weight with your GP or tracking your health progress.
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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
Conversion formulas:
- 1 kg = 0.157473 stone
- 1 stone = 6.35029 kg
- 1 kg = 2.20462 pounds (lbs)
- 1 lb = 0.453592 kg
- 1 stone = 14 pounds exactly
The table below covers typical adult weight ranges from 40kg to 150kg, showing the equivalent in both stone and pounds. This metric imperial conversion covers most UK adults. For example, 70kg equals 11 stone 0.1lbs. If you need to convert a specific weight, use our free weight converter above for gradual improvement across all weight units. The stone pounds kg conversion is essential when comparing your weight across different health resources—NHS records use kg, whilst most UK adults discuss their weight in stone.
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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 The UK Uses Stone For Everyday Weight Measurement
The UK is one of the few countries that still uses stone as the primary unit for body weight in everyday conversation. This historical system persists in clothing sizes, fitness discussions, and how people describe themselves to friends and family. However, the NHS and all clinical healthcare uses kilograms exclusively for accuracy and consistency with international medical standards. Your GP will record your weight in kg on your health records. Understanding both systems helps you navigate between casual conversation ("I weigh 11 stone") and clinical contexts ("My BMI at 70kg indicates..."). Use our free BMI calculator to see how your weight in either unit relates to healthy weight ranges according to NHS guidelines.
- 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 70kg in stones and pounds?
70kg equals 11 stone 0.1lbs (or approximately 11 stone exactly). To calculate: divide 70 by 6.35029 for stone, or multiply 70 by 2.20462 to get 154.3 lbs, which equals 11 stone 0.3lbs. The free weight converter on this page calculates this instantly for any weight.
How do I convert any kg weight to stone manually?
Divide the kg amount by 6.35029 to get stone. For example, 85kg ÷ 6.35029 = 13.4 stone (which is 13 stone 5.6lbs). To convert to pounds only, multiply kg by 2.20462. This metric imperial conversion works for any weight.
Why does the NHS use kg instead of stone?
The NHS uses kilograms because it's the international medical standard, allowing consistency across all healthcare systems globally. Kg is also more precise for clinical measurements, dosing calculations, and BMI assessment. Your GP records your weight in kg, though they understand both UK weight units.
What weight range is healthy according to UK guidelines?
A healthy BMI for UK adults is 18.5 to 24.9, which translates to specific weight ranges depending on height. For example, at 5ft 8in (173cm), healthy weight is approximately 55–74kg (8st 8lbs to 11st 10lbs). Use our BMI calculator to find your personal healthy weight range based on your exact height.
Is there a quick way to convert stone to kg without a calculator?
Yes—multiply the stone weight by 6.35. For example, 12 stone × 6.35 = approximately 76.2kg. This is close enough for everyday purposes, though precise conversions use 6.35029. For exact clinical accuracy, always use the weight converter tool on this page.
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.