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
Convert Kg to Stone Using NHS Weight Standards
Converting weight from kilograms to stone is straightforward using the standard conversion formula, but understanding how your weight compares to NHS healthy weight guidelines is equally important. The NHS uses both metric and imperial measurements, recognising that most UK adults prefer to discuss their weight in stone and pounds. This guide shows you how to convert kg to stone accurately and explains what the NHS considers a healthy weight range for different heights and backgrounds.
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.
NHS BMI Categories and Healthy Weight Ranges
The standard conversion is simple: divide kilograms by 6.35 to get stone, or multiply by 2.20462 for pounds. However, what matters most is whether your weight falls within the NHS healthy range. According to NHS guidelines, a healthy BMI is between 18.5 and 24.9 for most adults.
- Underweight: BMI below 18.5 (approximately 50–59kg for someone 5ft 8in tall)
- Healthy weight: BMI 18.5–24.9 (approximately 59–79kg for someone 5ft 8in tall)
- Overweight: BMI 25.0–29.9 (approximately 79–95kg for someone 5ft 8in tall)
- Obese: BMI 30.0 and above (95kg and above for someone 5ft 8in tall)
Use our free BMI calculator above to find your personal BMI instantly. The weight converter on this page also helps you see your weight across different units. Remember that BMI is a screening tool — it doesn't account for muscle mass, so your GP can provide more personalised guidance.
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.
Ethnicity-Adjusted Thresholds and Waist Measurement
The NHS recommends lower BMI thresholds for adults of South Asian, Chinese, Black African, and Black Caribbean heritage, as these groups face higher health risks from excess weight at lower BMI levels. For these populations, a healthy BMI range is 18.5–22.9, and overweight begins at 23.0. Waist circumference is also important: the NHS advises keeping it below 94cm (37 inches) for men and 80cm (31.5 inches) for women to reduce cardiovascular risk. Men with waist circumference above 102cm and women above 88cm face increased health risks. When discussing your weight with your GP, mention both your weight in stone and these measurements for a complete health picture.
- 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 conversion from kg to stone?
Divide kilograms by 6.35029 to get stone. For example, 70kg ÷ 6.35 = 11.02 stone (or 11 stone 0.3 lbs). Our weight converter tool above gives instant, precise conversions across kg, stone, and pounds in both directions.
What weight range is healthy according to the NHS?
NHS healthy weight is a BMI of 18.5–24.9. For someone 5ft 8in tall, this equals roughly 59–79kg (9st 4lb to 12st 6lb). For South Asian, Chinese, Black African, or Caribbean adults, the healthy range is slightly lower: BMI 18.5–22.9. Your GP can advise on your personal target range.
How do I know if my weight in stone is healthy?
Calculate your BMI using your weight and height — use our free BMI calculator on this page. If your BMI falls between 18.5–24.9, your weight is in the healthy range according to NHS guidelines. However, BMI doesn't account for muscle mass, so discuss your results with your GP for personalised advice.
Why does the NHS recommend different weight thresholds for some ethnic groups?
Research shows that people of South Asian, Chinese, Black African, and Black Caribbean heritage develop weight-related health conditions like type 2 diabetes at lower BMI levels. The NHS recommends lower thresholds (healthy BMI 18.5–22.9) for these populations to support earlier intervention and better health outcomes.
What is a healthy waist measurement according to the NHS?
The NHS advises: men should keep waist circumference below 94cm (37 inches), women below 80cm (31.5 inches). Above these levels, health risks increase. Men above 102cm and women above 88cm face significantly higher cardiovascular and metabolic risks, regardless of weight or BMI.
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.