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 5.4 Kg A Healthy Weight? Convert To Stone And Check Your Health Range
5.4 kg converts to approximately 0.85 stone (or 0 stone 12 pounds) using the standard kg to stone conversion. Whether this weight is healthy depends entirely on your height, age, and individual health factors. The NHS uses BMI (body mass index) as the primary screening tool to assess if a weight is healthy for a given height. Use our free BMI calculator above to enter your height and weight, and you'll instantly see whether 5.4 kg falls into a healthy range for your measurements. This guide explains what healthy weight means and how to interpret your results.
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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.
Healthy Weight Ranges By Height — What The NHS Says
At 5.4 kg, you're at a very light weight, so context is crucial. The NHS defines a healthy BMI as 18.5 to 24.9 for most UK adults. Here are three realistic examples of how 5.4 kg relates to health at different heights:
- If you're 120 cm tall (very short): 5.4 kg gives a BMI of approximately 37 — this would fall in the obese category. A healthy weight range at this height would be 18–27 kg.
- If you're 90 cm tall (child height): 5.4 kg is appropriate for a young child, but adult BMI categories don't apply to children — use the NHS Healthy Weight Calculator for children instead.
- If you're 150 cm tall (5ft 1in, petite adult): 5.4 kg gives a BMI of approximately 2.4 — this is significantly underweight. A healthy weight range at this height is 41–55 kg.
Use the weight converter on this page to switch between kilograms, stone, and pounds instantly. The key point: a weight of 5.4 kg is only healthy if you're a young child or extremely short-statured individual. For most UK adults, this weight would be dangerously low.
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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: What To Do If Your Weight Is Outside The Healthy Range
If your weight of 5.4 kg is significantly below the healthy range for your height, it's important to speak with your GP — being underweight can indicate malnutrition, medical conditions, or eating disorders that need professional support. The NHS recommends that healthy weight is achieved through a balanced diet and regular physical activity, not extreme restriction. If you're overweight or obese at your height, the NHS suggests losing weight gradually at a rate of 0.5–1 kg per week — sustainable, steady progress is safer than rapid loss. You can track your weight journey with our free progress tracker. For adults struggling with weight, the NHS also offers specialist weight management services through your GP. Remember: weight is just one health marker — waist circumference, fitness level, and blood pressure also matter.
- 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 5.4 kg in stone?
5.4 kg equals approximately 0.85 stone, or 0 stone 12 pounds. To convert kilograms to stone, divide the kilogram value by 6.35029. At 5.4 kg, you're at a very light weight that would only be healthy for very young children or extremely short-statured individuals.
Is 5.4 kg a healthy weight for an adult?
For most UK adults, 5.4 kg is significantly underweight and would indicate a serious health issue. A healthy weight depends on your height — use our BMI calculator to check your personal healthy range. If you weigh this little, speak with your GP urgently.
What is the healthy weight range for my height?
The NHS defines healthy weight using BMI categories. For example, at 160 cm tall, a healthy weight is approximately 47–63 kg. Use our free BMI calculator above to enter your height and see your personalised healthy weight range instantly.
How do I convert kilograms to stone easily?
Divide kilograms by 6.35 to get stone. For 5.4 kg: 5.4 ÷ 6.35 = 0.85 stone. Our free weight converter on this page does this instantly — just enter your weight and switch between kg, stone, and pounds.
What should I do if I'm underweight?
Speak with your GP if your weight is significantly below the healthy range for your height. Underweight can indicate nutritional deficiency, medical conditions, or eating disorders requiring professional support. Your GP can assess your health and recommend appropriate next steps.
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.