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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47 Pounds in Kg — What's Your BMI?
47 pounds converts to approximately 21.3 kg. However, what this weight means for your health depends entirely on your height. A weight of 21.3 kg alone doesn't tell us much — it's your BMI (body mass index) that matters. BMI combines your weight with your height to show whether you're in a healthy weight range according to NHS guidelines. Use our free BMI calculator above to find your exact BMI, or check the examples below for common heights.
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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.
BMI Examples at 47 Pounds (21.3 kg)
Here's what a weight of 47 pounds (21.3 kg) means in terms of BMI at different heights, using NHS categories:
- At 5ft 0in (152cm): BMI = 20.5 — Healthy weight
- At 5ft 4in (163cm): BMI = 18.0 — Healthy weight
- At 5ft 8in (173cm): BMI = 16.0 — Underweight
- At 6ft 0in (183cm): BMI = 14.5 — Underweight
Remember, this is a very low weight for most UK adults. If you're an adult weighing 47 pounds, it's important to speak with your GP, as this may indicate an underlying health condition. For children, weight assessment uses different charts — please consult NHS growth references or your healthcare provider.
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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 and Limitations
NHS BMI categories are: underweight (below 18.5), healthy weight (18.5–24.9), overweight (25.0–29.9), and obese (30.0+). However, BMI has important limitations. It doesn't account for muscle mass, bone density, or where fat is stored on your body. Athletes can have a high BMI despite being fit. Waist circumference also matters — increased health risk occurs when waist exceeds 94cm (men) or 80cm (women). Use our free weight converter to check conversions between kg, stone, and pounds, and always consult your GP about 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 47 pounds in kilograms?
47 pounds equals approximately 21.3 kg. To convert pounds to kilograms, divide by 2.205. The exact conversion is 21.32 kg. You can also use our free weight converter above to switch instantly between pounds, kilograms, stone, and other units.
Is 47 pounds a healthy weight for an adult?
47 pounds (21.3 kg) is extremely low for an adult and would be underweight at any height. If you weigh this much, please contact your GP urgently. For children, weight assessment uses different age and sex-specific growth charts — consult NHS resources or your healthcare provider for guidance.
What does BMI tell me that weight alone doesn't?
BMI combines your weight with your height to assess whether you're in a healthy range for your size. Your weight alone is meaningless — 47 pounds might be healthy for a young child but dangerously low for an adult. BMI provides context. However, BMI doesn't distinguish muscle from fat, so it has limitations for very athletic people.
Does 47 pounds convert to stone?
Yes. 47 pounds equals approximately 3 stone 5 pounds (or 3st 5lbs). To use the metric to imperial weight conversion method, remember that 1 stone = 14 pounds. If you're converting between stone and kg, you can also use our weight converter tool for gradual improvement across all units.
Who should weigh around 47 pounds?
47 pounds (21.3 kg) is a typical weight for children aged approximately 8–10 years old, depending on their individual growth. For adults, this weight would indicate a serious health concern requiring medical attention. If you're concerned about weight — yours or a child's — speak with your GP or use NHS growth references for guidance.
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.