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
28 Kg to Stones and Pounds — What's Your BMI?
28 kilograms is equivalent to 4 stone and 6.2 pounds in UK measurements. However, whether this weight is healthy depends entirely on your height. Use our free BMI calculator above to find your exact BMI, or read on to see what BMI 28kg gives at different heights and which NHS category applies to you.
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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.
What BMI Does 28 Kg Give at Different Heights?
Your BMI depends on both weight and height. At 28kg, here's what your BMI would be at various heights:
- 150cm (4ft 11in): BMI of 12.5 — Underweight
- 160cm (5ft 3in): BMI of 10.9 — Underweight
- 170cm (5ft 7in): BMI of 9.7 — Underweight
- 175cm (5ft 9in): BMI of 9.1 — Underweight
- 180cm (5ft 11in): BMI of 8.6 — Underweight
- 190cm (6ft 3in): BMI of 7.7 — Underweight
At 28kg across all heights, you fall significantly below the NHS healthy weight range. The metric to imperial weight conversion shows 28kg as 4 stone 6.2 pounds, but BMI context matters more than the number alone.
Clinically BackedWeight Loss
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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 BMI Categories and What They Mean
According to NHS guidelines, a healthy BMI falls between 18.5 and 24.9 for most UK adults. At 28kg, your BMI is well below this range at all heights, placing you in the underweight category. Being significantly underweight can affect bone density, immune function, and energy levels. If you're concerned about being underweight, speak with your GP who can assess your individual health and provide personalised advice. You can use our free weight converter to check your weight in different units, and our BMI calculator to monitor any changes.
- 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 28kg to stones and pounds?
Divide 28 by 6.35029 to get stones, or multiply by 2.20462 to get pounds. 28kg equals 4 stone and 6.2 pounds. Use our free weight converter above for instant conversions between kg, stone, and pounds.
Is 28kg a healthy weight?
28kg is significantly underweight at all heights. A healthy weight depends on your height and overall health. Calculate your BMI using our free calculator above. If you're concerned, speak with your GP about your individual health needs.
What BMI is 28kg at 170cm?
At 170cm, 28kg gives a BMI of 9.7, which is classified as underweight by NHS guidelines. A healthy BMI at this height would be between 18.5 and 24.9. Consult your GP if you have concerns about your weight or health.
Why does BMI matter more than just the weight number?
BMI combines your weight with your height to give a more meaningful health indicator. Two people weighing 28kg could have very different BMIs depending on their height. That's why the kilogram to stone conversion alone doesn't tell you whether a weight is healthy — height context is essential.
Should I use the stone and pounds measurement or kg?
Both are useful. UK NHS uses kg clinically, but many UK adults prefer stone and pounds for everyday reference. Use whichever feels natural to you — our free weight converter lets you switch between both instantly.
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.