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 28 Kilos in Stone a Healthy Weight?
28 kilos converts to 4 stone 6.2 pounds, but whether this is a healthy weight depends entirely on your height. Using NHS BMI guidelines, 28kg falls in the healthy range for some adults and the underweight range for others. Your height, age, and body composition all matter. Use our free BMI calculator above to check your personal BMI and discover what the NHS considers a healthy weight range for your exact measurements. The healthy weight range varies significantly by height — we'll show you three real examples below.
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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 at Different Heights
To understand if 28kg is healthy for you, we need to consider your height. A healthy BMI (18.5–24.9) produces different weight ranges depending on how tall you are. Here are three concrete examples:
- At 150cm (4ft 11in): 28kg gives a BMI of 12.4 — below the healthy range (underweight). Healthy weight range is 41.6–61.5kg.
- At 160cm (5ft 3in): 28kg gives a BMI of 10.9 — below the healthy range (underweight). Healthy weight range is 47.3–63.7kg.
- At 170cm (5ft 7in): 28kg gives a BMI of 9.7 — below the healthy range (underweight). Healthy weight range is 53.5–71.8kg.
Convert kilograms to stone instantly using our free weight converter to see your weight in both imperial and metric units. If your BMI falls below 18.5, speak with your GP — very low body weight can indicate nutritional or health concerns.
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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.
What to Do If 28kg Is Below Your Healthy Range
If 28kg is underweight for your height, it's important to address this with your GP. Underweight individuals may face increased risks including weakened immunity, bone loss, and nutrient deficiencies. Your GP can investigate whether your low weight is due to dietary intake, underlying health conditions, or other factors. They may refer you to a dietitian or nutritionist for personalised guidance.
Remember: weight is just one aspect of health. Waist circumference and overall fitness also matter. NHS guidance emphasises that being at a healthy weight range supports better long-term health outcomes. Use the BMI calculator on this page to track your measurements, and don't hesitate to discuss any weight concerns with your healthcare team.
- 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 28kg in stone exactly?
28kg converts to 4 stone 6.2 pounds, or approximately 4 stone 6 lbs in practical terms. Use our free weight converter above to switch between kg, stone, and pounds instantly for any weight.
Is 28kg a healthy weight for an adult?
At 28kg, most adults would be significantly underweight according to NHS BMI guidelines, regardless of height. A BMI below 18.5 is classified as underweight. Your GP can assess whether this weight is appropriate for your individual circumstances and health.
What's the healthy weight range for someone 160cm tall?
For someone 160cm (5ft 3in) tall, the NHS healthy weight range is approximately 47–64kg (7st 6lbs to 10st 1lb). At 28kg, this would be well below the healthy range. Calculate your exact range using our BMI calculator.
Why does height affect healthy weight so much?
Height affects how weight is distributed across your body. Taller people naturally weigh more at a healthy BMI. This is why BMI divides weight by height squared — it accounts for this relationship and provides a fair comparison across different heights.
Should I be concerned if I'm 28kg?
Yes, you should speak with your GP. At 28kg, most adults would be clinically underweight and at risk of health complications including weakened immunity and nutrient deficiencies. Your GP can investigate the cause and recommend appropriate support.
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.