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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23 Kg to Stone — Instant Conversion
23 kilograms equals 3 stone and 8.1 pounds in UK measurements. This weight is considered significantly underweight for most UK adults, depending on height. To understand whether 23kg is a healthy weight for you personally, it's important to consider your height as well as your weight. Our free BMI calculator above will help you check your personal BMI instantly. The conversion from kilogram to stone conversion is straightforward using standard metric to imperial weight formulas. This weight is rarely seen in healthy adults and may indicate a significant health concern that warrants discussion with your GP.
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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.
23 Kg to Stone Conversion Table
23 kg = 3 stone 8.1 pounds
To convert kilograms to stone, divide the kilogram value by 6.35029. For 23 kg: 23 ÷ 6.35029 = 3.628 stone.
To break this into stone and pounds: multiply the decimal (0.628) by 14 to get pounds = 8.8 pounds, giving you 3 stone 8.1 pounds total.
Here's a nearby values reference table for context:
- 18 kg = 2 stone 12.0 lbs
- 20 kg = 3 stone 2.2 lbs
- 21 kg = 3 stone 5.2 lbs
- 22 kg = 3 stone 6.6 lbs
- 23 kg = 3 stone 8.1 lbs
- 24 kg = 3 stone 9.6 lbs
- 25 kg = 3 stone 11.0 lbs
- 26 kg = 4 stone 0.5 lbs
Use our free weight converter above to switch between kg, stone, and pounds instantly for any value.
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.
BMI and Health Context at 23 Kg
At 23 kg, your BMI depends significantly on your height. For an average UK adult woman (163 cm / 5ft 4in), a weight of 23 kg would result in a BMI of approximately 8.7 — far below the healthy range of 18.5 to 24.9 according to NHS guidelines. This would indicate severe underweight status requiring urgent medical attention.
For an average UK adult man (175 cm / 5ft 9in), 23 kg would give a BMI of around 7.5 — also severely underweight. At this weight range, there are significant health risks including malnutrition, weakened immunity, and organ dysfunction. If you or someone you know weighs 23 kg as an adult, this warrants immediate discussion with your GP or a healthcare professional.
- 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.
Is 23 kg a healthy weight for an adult?
No. 23 kg is severely underweight for any adult and falls far below the NHS healthy weight range. Adults of typical UK height and build require substantially more weight for health. This weight would indicate serious malnutrition and requires urgent medical assessment from your GP.
What is 23 kg in stone and pounds exactly?
23 kg equals 3 stone and 8.1 pounds. To calculate: divide 23 by 6.35029 to get 3.628 stone, then multiply the decimal (0.628) by 14 to convert to pounds (8.8 lbs), giving 3 stone 8.1 lbs total.
How do I use the kg to stone conversion formula?
The kilogram to stone formula is: kg ÷ 6.35029 = stone. For 23 kg: 23 ÷ 6.35029 = 3.628 stone. To express as stone and pounds, multiply the decimal by 14. Our free weight converter above does this instantly for any value.
What BMI would I have at 23 kg?
Your BMI at 23 kg depends on your height. For a typical UK woman (5ft 4in), BMI would be approximately 8.7. For a typical man (5ft 9in), approximately 7.5. Both are severely underweight. Use our free BMI calculator above to find your personal BMI using your exact height and weight.
Should I be concerned if my weight is 23 kg?
Yes. 23 kg is dangerously low for an adult and indicates severe malnutrition or an underlying health condition. This requires urgent medical attention. Please contact your GP immediately, or if in crisis, call 999 or visit your nearest A&E department.
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.