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
Free tracker included with every download this week
Understanding Weight Conversion in the UK
Weight conversion between kilograms, stone, and pounds is essential for understanding your health in the UK. Whether you're reading NHS health guidance, tracking progress with a weight loss programme, or simply comparing your weight across different measurement systems, knowing how to convert weight accurately helps you make informed health decisions. MyWeightCheck provides free tools to convert your weight and calculate your healthy weight range instantly.
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.
How Weight Conversion Works in the UK
The UK uses a unique mix of metric and imperial measurements for weight. One kilogram equals 2.20462 pounds, and one stone equals exactly 14 pounds or 6.35029 kilograms. To convert kg to stone, divide your weight in kilograms by 6.35029. For example, 70kg converts to approximately 11 stone 0.1lbs. The NHS uses kilogram measurements in clinical settings, but most UK adults still think and talk about weight in stone and pounds — making conversions invaluable for everyday health management and weight management discussions with your GP.
- 1 kg = 2.20462 lbs
- 1 stone = 6.35029 kg (or 14 lbs exactly)
- To convert kg to stone: divide by 6.35029
- To convert stone to kg: multiply by 6.35029
Use our free weight converter above to switch between any measurement instantly. Understanding these conversions helps you track weight loss progress, compare health guidance, and communicate effectively with healthcare professionals about your weight and health goals.
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.
Healthy Weight and Weight Management in the UK
Converting your weight is most useful when combined with understanding what a healthy weight range means for you. According to NHS guidance, a healthy BMI (body mass index) is between 18.5 and 24.9. Our free BMI calculator helps you find your personal BMI and healthy weight range based on your height. For South Asian, Chinese, Black African, and Black Caribbean adults, the NHS recommends slightly lower thresholds — reflecting different health risks at the same weight. Whether you're starting a weight loss journey, managing a health condition, or simply monitoring your weight management progress, knowing how to convert between units ensures you understand NHS health advice and track your progress accurately.
- 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.
How do I convert 70kg to stone?
Divide 70 by 6.35029 to get approximately 11 stone 0.1lbs. Use our free weight converter above for instant conversions. This is a common reference weight in UK health guidance.
Why does the UK use stone and pounds when most countries use kg?
UK tradition and cultural preference — stone and pounds have been used for centuries. The NHS uses kilograms clinically, but most UK adults still prefer stone. This mix means conversions are essential for health literacy.
What's my healthy weight range in the UK?
Your healthy weight depends on your height and individual health. Use our free BMI calculator to find your personal healthy weight range. A BMI of 18.5–24.9 is considered healthy by NHS guidelines (slightly lower for some ethnic groups).
How often should I check my weight and conversions?
The NHS recommends weighing yourself weekly or fortnightly if tracking weight loss. Our free progress tracker helps you log changes over time. Consistency matters more than frequency — track in the same units using our converter.
Should I convert my weight before seeing my GP?
No — your GP will have your weight on record. However, understanding conversions helps you track personal progress and understand health guidance. Discuss your weight management goals with your GP in whatever units feel natural to you.
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.