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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What is 128kg in stones?
128kg is equal to 20 stone and 2 pounds (20st 2lbs). This conversion uses the standard metric to imperial weight formula: divide kilograms by 6.35029 to get the stone equivalent. In the UK, where many people use stone and pounds for body weight, understanding your weight in this format can make health conversations with your GP clearer. Use our free weight converter above to switch between kg, stone, and pounds instantly, or read on for the full conversion breakdown and what this weight means for your health.
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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.
Converting 128kg to Stone — Full Breakdown
To convert 128kg to stone using the standard kg to stone conversion formula, divide 128 by 6.35029. This gives exactly 20.157 stone, which breaks down to 20 stone and 2 pounds (20st 2lbs). If you prefer metric to imperial weight conversions, you can also express 128kg as 282.2 lbs (pounds). The table below shows how 128kg compares to nearby weight values in both stones and lbs and metric measurements, making it easy to see the conversion across a range.
- 125kg = 19st 9.7lbs
- 126kg = 19st 12.5lbs
- 127kg = 20st 0.2lbs
- 128kg = 20st 2lbs
- 129kg = 20st 3.8lbs
- 130kg = 20st 5.6lbs
- 131kg = 20st 7.4lbs
- 132kg = 20st 9.2lbs
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.
BMI and Health Context at 128kg
At 128kg, your BMI depends on your height. For example, at an average UK male height of 175cm (5ft 9in), a weight of 128kg gives a BMI of 41.7, which falls into the severely obese (Class III) category according to NHS guidelines. At an average UK female height of 162cm (5ft 4in), 128kg results in a BMI of 48.7. The healthy BMI range is 18.5 to 24.9 for most adults, though for South Asian, Chinese, Black African, or Black Caribbean adults, the NHS recommends lower thresholds. Use our free BMI calculator above to find your exact BMI at your height, and speak with your GP about what this means for 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 128kg to stones and pounds?
Divide 128 by 6.35029 to get 20.157 stone. This equals 20 stone and 2 pounds (20st 2lbs). Alternatively, multiply 128 by 2.20462 to get 282.2 pounds. Our weight converter above makes this instant.
Is 128kg considered overweight or obese?
Yes. At most adult heights, 128kg falls into the obese category (BMI 30+) or severely obese (BMI 40+). Your exact BMI depends on your height. Use the free BMI calculator on this page to check your personal BMI.
What is the healthy weight range for my height?
The healthy BMI range is 18.5 to 24.9, which translates to different weights depending on height. At 175cm, healthy weight is roughly 55–76kg. At 162cm, it's roughly 49–65kg. Your GP can discuss healthy weight targets for you personally.
How can I track weight changes from 128kg?
Use our free progress tracker to log your weight regularly and monitor trends over time. Even small reductions in weight—losing 5–10% of body weight—can meaningfully improve health markers like blood pressure and blood sugar.
Should I speak to my GP about my weight?
Yes. If you're concerned about your weight or health, your GP can provide personalised guidance, discuss weight management options including lifestyle changes, and assess whether any medical support would be helpful for your situation.
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.