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's 5.3 Kg in Stone, and What's Your BMI?
5.3 kg converts to approximately 0 stone 12 pounds (or 11.7 lbs) in UK measurements. However, BMI depends entirely on your height — the same weight gives a very different BMI result for a shorter person versus a taller person. This guide shows you what BMI this weight represents at different heights, and how each result compares to NHS health categories. Use our free BMI calculator above to find your exact BMI instantly by entering your own height and weight.
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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.
5.3 Kg BMI at Different Heights
At 5.3 kg, your BMI varies significantly with height. Here are six examples:
- At 150 cm (4ft 11in): BMI = 23.6 (healthy weight)
- At 155 cm (5ft 1in): BMI = 22.1 (healthy weight)
- At 160 cm (5ft 3in): BMI = 20.7 (healthy weight)
- At 165 cm (5ft 5in): BMI = 19.4 (healthy weight)
- At 170 cm (5ft 7in): BMI = 18.3 (healthy weight)
- At 175 cm (5ft 9in): BMI = 17.3 (underweight)
As you can see, 5.3 kg is a very low body weight — at most adult heights it falls below or at the lower edge of the healthy weight range. Using our weight converter, you can check the exact stone and pounds equivalent for your own calculations.
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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 NHS BMI Categories
The NHS defines healthy BMI as 18.5 to 24.9 for most UK adults. In the examples above, 5.3 kg produces a healthy BMI only at heights below 155 cm — for most adults, this weight would be considered underweight (BMI below 18.5). Remember that BMI doesn't account for muscle mass, frame size, or where fat is stored. For South Asian, Chinese, Black African, or Black Caribbean adults, the NHS recommends slightly lower thresholds (18.5 to 22.9 as healthy). If you're concerned about being underweight or have questions about what's healthy for you, speak with your GP who can give personalised advice based on 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.
How do I convert 5.3 kg to stone and pounds?
To convert kilograms to stone, divide by 6.35029. So 5.3 kg ÷ 6.35029 = 0.835 stone. To express this as stone and pounds, multiply the decimal by 14: 0.835 × 14 = 11.7 pounds. So 5.3 kg = 0 stone 12 pounds (rounded). Our free weight converter on this page calculates this instantly.
Is 5.3 kg a healthy weight?
5.3 kg is a very low body weight for most UK adults. Whether it's healthy depends entirely on your height and age. At heights below 155 cm, it may fall within the healthy BMI range (18.5–24.9). For taller adults, it would be underweight. Your GP can assess whether your weight is healthy based on your individual circumstances, medical history, and any health conditions.
What's the difference between kilos in stone versus pounds?
Stone is a UK imperial unit equal to exactly 14 pounds. Kilos are metric. The conversion is: 1 kg = 0.157 stone = 2.205 pounds. So 5.3 kg = 0.835 stone = 11.7 lbs. Using the weight converter on this page, you can switch between all three measurements instantly.
Why does BMI matter at 5.3 kg?
BMI is a screening tool that helps assess whether weight is in a healthy range relative to height. At 5.3 kg, BMI indicates whether you're underweight, healthy, or at risk — but BMI alone doesn't tell the whole story. It doesn't account for muscle mass or fat distribution. Your GP can give you more detailed health advice than BMI alone provides.
Should I be concerned if I weigh 5.3 kg?
5.3 kg is an extremely low weight for any adult human — this weight is more typical of a newborn baby. If this is your actual current weight, please contact your GP or hospital immediately, as this indicates a serious medical condition requiring urgent care. Our BMI calculator and health guides are designed for typical adult weights.
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.