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 47 Kg in Stones and What's Your BMI?
47 kilograms converts to 7 stone 6.4 pounds in UK measurements. However, your BMI at this weight depends entirely on your height—the same weight gives a very different BMI for a shorter person versus someone taller. Use our free BMI calculator above to find your personal BMI instantly, or read on to see what BMI you'd have at common UK heights.
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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.
47 Kg BMI at Different Heights
To convert kilograms to stone, divide 47 by 6.35029, which gives 7 stone 6.4 pounds. Your BMI at this weight varies significantly depending on your height. Here's what 47 kg means in terms of BMI across different heights:
- At 1.50m (4ft 11in): BMI 20.9 — Healthy weight (NHS category)
- At 1.60m (5ft 3in): BMI 18.4 — Underweight (just below healthy range)
- At 1.70m (5ft 7in): BMI 16.3 — Underweight
- At 1.80m (5ft 11in): BMI 14.5 — Underweight
- At 1.90m (6ft 3in): BMI 13.0 — Underweight (significantly low)
These BMI figures show that 47 kg is a very light weight for most UK adults and would typically fall into the underweight category except at shorter heights. Your GP can advise whether your weight is healthy for your individual circumstances.
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No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
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
The NHS defines a healthy BMI range as 18.5 to 24.9 for most adults. However, BMI has important limitations—it doesn't distinguish between muscle and fat, so athletes may have a high BMI despite being fit. At 47 kg, most adults would be significantly underweight, which can carry health risks including weakened immune function and low bone density. For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, different BMI thresholds apply. Track your weight progress using our free progress tracker to monitor changes over time, and always discuss your weight with your GP to ensure it's appropriate for your health needs.
- 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 47 kg to stone and pounds?
Divide 47 by 6.35029 to get stone, or multiply by 2.20462 to get pounds. 47 kg equals 7 stone 6.4 pounds, or approximately 103.6 lbs. Use our free weight converter above for instant conversions between kg, stone, and pounds.
Is 47 kg a healthy weight?
Whether 47 kg is healthy depends on your height and individual health. At most heights, 47 kg falls into the underweight BMI category, which can pose health risks. Your GP can assess whether your weight is appropriate for your age, height, and health status.
What BMI would I have at 47 kg if I'm 5ft 6in?
At 1.68m (5ft 6in), a weight of 47 kg gives a BMI of approximately 16.6, which falls into the underweight category according to NHS guidelines. Calculate your exact BMI instantly using our free BMI calculator on this page.
What are the health risks of being underweight at 47 kg?
Being significantly underweight can increase risks of weakened immunity, poor bone health, nutrient deficiencies, and hormonal imbalances. If you're struggling to maintain a healthy weight, speak to your GP about support and advice tailored to your circumstances.
Does BMI tell the whole story about health?
No—BMI is a screening tool but has limitations. It doesn't account for muscle mass, where fat is stored, or individual health factors. Waist circumference, fitness level, and overall health markers are also important. Your GP can provide personalised guidance on your health beyond just BMI.
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.