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
What Is 43kg In Stone?
43kg is equivalent to 6 stone and 10.3 pounds in UK measurements. If you're converting weight for health purposes, it's helpful to understand what this means in the context of BMI and healthy weight ranges according to NHS guidance. Our free weight converter makes it easy to switch between metric and imperial measurements instantly, and our BMI calculator can show you where this weight falls for your height and age.
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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.
43kg Conversion to Stone and Pounds
43kg converts to 6 stone 10.3 pounds using the standard UK conversion formula. To break this down: divide 43 by 6.35029 (the number of kilograms in one stone) to get 6.78 stone. The decimal 0.78 converts to approximately 10.3 pounds (since 1 stone = 14 pounds).
- 43kg = 6 stone 10.3 lbs (exact)
- 43kg = 94.8 lbs (in pounds alone)
- 43kg = 6.78 stone (decimal format)
This weight is considerably below the UK average adult weight and falls well within the healthy weight range for most heights. Use our free weight converter above to check how this converts alongside your height, or try our BMI calculator to see where you sit on the NHS BMI scale.
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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.
Is 43kg a Healthy Weight in the UK?
Whether 43kg is healthy depends on your height and age. According to NHS guidelines, a healthy BMI is between 18.5 and 24.9 for most adults. At 43kg, you would need to be approximately 155–165cm (5ft 1in–5ft 5in) tall to fall comfortably within the healthy weight range.
For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, slightly different BMI thresholds apply, starting at 18.5 to 22.9 for healthy weight.
Remember that BMI is a screening tool only and does not account for muscle mass or individual body composition. Your GP can give personalised health advice based on your individual circumstances.
- 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 43kg to stone manually?
Divide 43 by 6.35029. The result is 6.78 stone. To convert the decimal to pounds, multiply 0.78 by 14 (since 1 stone = 14 pounds), which gives approximately 10.9 pounds. So 43kg = 6 stone 10 pounds approximately.
Is 43kg underweight, healthy, or overweight?
At 43kg, your weight category depends on your height. For someone 160cm (5ft 3in) tall, 43kg gives a BMI of approximately 16.8, which is underweight. For someone 155cm (5ft 1in) tall, it's approximately 17.9, still underweight. Use our BMI calculator to check your personal BMI.
What's the average UK adult weight compared to 43kg?
The UK average adult weight is approximately 85.7kg for men and 71.6kg for women. 43kg is considerably below average and would typically indicate underweight status. If you have concerns about your weight, speak with your GP.
Can I use 43kg as a reference point for healthy weight loss?
43kg is very low and not a realistic target weight for most adults. The NHS recommends losing 0.5–1kg per week through sustainable lifestyle changes. Never aim for rapid or extreme weight loss without medical supervision.
Does 43kg relate to any weight loss medication eligibility?
Weight loss medications like Mounjaro or Wegovy are prescribed for adults above a certain BMI threshold, typically starting at BMI 30 or above. At 43kg, clinical assessment would be needed. Consult your GP for personalised advice about weight management options.
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.