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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What Is 43 Kg In Stone? BMI Guide
43 kilograms converts to 6 stone 10 pounds (6st 10lbs) in UK measurements. However, your BMI — which indicates whether this weight is healthy for you — depends entirely on your height. At different heights, 43kg gives very different BMI results, ranging from underweight to overweight according to NHS guidelines. Use our free BMI calculator above to find your exact BMI instantly, or explore the examples below to see how height affects your health category.
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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.
43 Kg BMI At Different Heights
At 43kg, your BMI varies significantly depending on your height. Here's how this weight translates across common UK heights using the standard kg to stone conversion framework:
- 1.50m (4ft 11in): BMI of 19.1 — healthy weight (NHS category)
- 1.55m (5ft 1in): BMI of 17.9 — healthy weight
- 1.60m (5ft 3in): BMI of 16.8 — underweight
- 1.65m (5ft 5in): BMI of 15.8 — underweight
- 1.70m (5ft 7in): BMI of 14.9 — underweight
- 1.75m (5ft 9in): BMI of 14.0 — underweight
These examples show that at 43kg, only people of below-average height fall into the healthy weight range. Taller individuals would be classified as underweight at this weight. Convert kilograms to stone using the ratio 1 stone = 6.35kg to verify these conversions yourself.
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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.
Understanding BMI Categories & Limitations
The NHS uses BMI to screen for health risk, with healthy BMI ranging from 18.5 to 24.9 for most UK adults. At 43kg, whether you're in this range depends on your height — shorter adults may have a healthy BMI, whilst taller adults would be underweight. BMI has limitations: it doesn't distinguish between muscle and fat, doesn't account for where fat is stored, and may be less accurate for very muscular individuals, elderly people, or those with certain medical conditions. For South Asian, Chinese, Black African, or Black Caribbean adults, the NHS recommends lower BMI thresholds due to higher health risks at the same weight. Your GP can provide personalised guidance on what your weight means for your individual health.
- 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 43kg in stone and pounds?
43 kilograms equals 6 stone 10 pounds (6st 10lbs) exactly. To convert kilograms to stone, divide by 6.35. This conversion is useful for UK weight discussions, though your GP typically uses kilograms for clinical records.
Is 43kg a healthy weight?
It depends on your height. At 43kg, people around 1.50m (4ft 11in) fall into the healthy BMI range (18.5–24.9). Taller individuals would be underweight. Use our free BMI calculator above to find your personal BMI based on your exact height.
What does underweight BMI mean?
A BMI below 18.5 indicates underweight status, which may signal insufficient nutrition or underlying health issues. Underweight can increase risk of bone loss, weakened immunity, and hormonal problems. Speak to your GP if you're consistently underweight.
How does stone to kg conversion work?
1 stone equals exactly 6.35029 kilograms. To convert stone and pounds to kilograms, multiply stone by 6.35 and pounds by 0.453592, then add them together. Our weight converter tool handles this automatically for you.
Should I use BMI or other measurements?
BMI is a useful screening tool but has limitations. The NHS also recommends measuring waist circumference — over 88cm for women or 102cm for men may indicate increased health risk even at a healthy BMI. Your GP can assess your overall health picture, not just BMI alone.
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.