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's 47kg in Stones? BMI & NHS Health Context
47kg in stones equals approximately 7 stone 6 pounds. However, whether this is a healthy weight depends entirely on your height. Using our free BMI calculator, you can check your personal BMI instantly at your specific height. BMI is a useful screening tool that helps determine whether your weight falls within a healthy range according to NHS guidelines. This guide explains what 47kg means in UK measurements, shows how BMI varies with height, and covers NHS weight categories to help you understand your health context.
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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.
47kg BMI at Different Heights — NHS Categories
To convert 47kg to stone, divide by 6.35029: 47kg = 7 stone 6 pounds (7st 6lbs). Your BMI at this weight depends on your height. Here are typical BMI values for a 47kg person at different heights, using the standard kilos to stone conversion alongside BMI calculation:
- At 150cm (4ft 11in): BMI 20.9 (healthy weight, NHS category 18.5–24.9)
- At 155cm (5ft 1in): BMI 19.6 (healthy weight)
- At 160cm (5ft 3in): BMI 18.4 (just below healthy range, borderline underweight)
- At 165cm (5ft 5in): BMI 17.2 (underweight, NHS category below 18.5)
- At 170cm (5ft 7in): BMI 16.3 (underweight)
- At 175cm (5ft 9in): BMI 15.3 (underweight)
At 47kg, BMI falls in the underweight or healthy range depending on your height. For anyone under 160cm, this weight typically sits in the healthy category. For taller individuals, it may fall below the NHS healthy weight threshold.
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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 & Healthy Weight Ranges
The NHS defines healthy BMI as 18.5 to 24.9 for most UK adults. BMI is calculated as weight (kg) divided by height (m) squared. However, BMI has important limitations: it doesn't account for muscle mass, bone density, or where fat is stored on the body. Waist circumference is also important for health — the NHS recommends keeping waist measurements below 94cm (37 inches) for men and 80cm (31.5 inches) for women to reduce health risks. For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, lower BMI thresholds apply (18.5–22.9 for healthy weight). Use our weight converter to switch between metric and imperial measurements, and consult your GP if you're concerned about your weight or 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.
How do I convert 47kg to stone and pounds?
Divide 47 by 6.35029 to get stone. 47kg equals 7 stone 6 pounds (7st 6lbs). You can also use our free weight converter above to convert between kg, stone, and pounds instantly in both directions.
Is 47kg a healthy weight?
It depends on your height. At 47kg, BMI is healthy (18.5–24.9) for people around 150–160cm tall. For taller individuals, 47kg may fall into the underweight category. Use our BMI calculator above at your specific height for a personal assessment.
What's the NHS healthy weight range for my height?
Healthy BMI is 18.5–24.9 according to NHS guidelines. To find your healthy weight range, multiply your height in metres squared by 18.5 (lower limit) and 24.9 (upper limit). For example, at 160cm: healthy range is 47–64kg. Your GP can provide personalised guidance.
Why does 47kg give different BMI values at different heights?
BMI measures weight relative to height. A fixed weight like 47kg is underweight for a tall person but healthy for a shorter person. This is why height matters — two people at 47kg can have very different health contexts depending on their stature.
Should I be concerned if my BMI is underweight?
If your BMI is below 18.5, speak to your GP. Underweight status can indicate insufficient nutrition, health conditions, or eating disorders. Your GP can assess your individual health and advise whether weight gain or further investigation is needed.
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.