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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Is 47kg a Healthy Weight? Convert to Stone and Pounds
47kg converts to 7 stone 5.3 pounds in UK measurements. Whether this weight is healthy depends entirely on your height — the same weight can be healthy for one person and underweight for another. Use our free BMI calculator above to check your personal BMI, which takes your height into account. This guide shows healthy weight ranges for different heights and explains NHS guidance on what healthy weight means.
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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.
Healthy Weight Ranges at Different Heights
A weight of 47kg falls into different health categories depending on your height. Here are three realistic examples showing how the same 47kg weight produces very different BMI results:
- At 155cm (5ft 1in): 47kg gives a BMI of 19.6 — healthy weight range
- At 165cm (5ft 5in): 47kg gives a BMI of 17.3 — underweight (below healthy range of 18.5–24.9)
- At 175cm (5ft 9in): 47kg gives a BMI of 15.3 — significantly underweight
For reference, the NHS healthy weight range is a BMI of 18.5–24.9 for most adults. The healthy weight range for a given height can be calculated using our BMI calculator or by checking NHS weight charts. If your BMI falls outside the healthy range, speak with your GP about what this means for your individual health.
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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.
NHS Guidance and What to Do Next
The NHS recommends that healthy weight is defined not just by a single number, but by a healthy BMI range for your height, combined with waist circumference. A waist measurement above 80cm (31.5 inches) for women or 94cm (37 inches) for men indicates increased health risk, even at a healthy BMI.
If 47kg is below or above your healthy range for your height, your GP can offer personalised guidance. Weight that is too low can indicate undernutrition or underlying health conditions. Try our free weight converter to see your weight in different units, and use the progress tracker to monitor changes over time if recommended by your healthcare provider.
- 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 47kg underweight?
It depends on height. At 155cm, 47kg is healthy (BMI 19.6). At 165cm, it's underweight (BMI 17.3). At 175cm, it's significantly underweight (BMI 15.3). Use your height to calculate your personal BMI for an accurate picture of your weight status.
How do I convert 47kg to stone and pounds?
47kg equals 7 stone 5.3 pounds. To convert kilograms to stone, divide by 6.35029. To convert kg to stone and pounds together: (47 ÷ 6.35) = 7 stone, then multiply the remainder (0.4 stone) by 14 to get pounds.
What's the healthy weight range for someone 160cm tall?
For an adult 160cm (5ft 3in) tall, the healthy BMI range is 18.5–24.9, which corresponds to a weight of approximately 47–63kg (7st 5lbs–9st 13lbs). Use our BMI calculator to check your exact healthy range based on your height.
Should I be concerned if I weigh 47kg?
Not necessarily — it depends on your height, age, sex, and muscle mass. If you're concerned about whether your weight is healthy for you, discuss it with your GP. They can assess your overall health, not just weight, and advise whether any action is needed.
How does waist measurement matter if my weight is 47kg?
Even at a healthy weight, where fat is stored matters. The NHS recommends measuring waist circumference: over 80cm for women or 94cm for men indicates increased health risk. Waist measurement is a useful addition to BMI and weight when assessing health.
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.