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 128 kg in Stone?
128 kilograms is equal to 20 stone and 2.4 pounds (or approximately 20st 2lbs). To convert kilograms to stone, divide the kilogram value by 6.35029. At 128 kg, you're in the overweight or obese range according to NHS guidelines, though your exact health category depends on your height and individual circumstances. Use our free BMI calculator above to check your personal BMI and understand what this weight means for your health at your specific height.
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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.
128 Kg to Stone Conversion Formula & Reference Table
Conversion formula: To calculate kg to stone, divide kilograms by 6.35029. So 128 kg ÷ 6.35029 = 20.17 stone.
Breaking this down: 20 complete stones equals 127.01 kg, leaving 0.99 kg remaining. Converting this remainder to pounds (0.99 kg × 2.20462 = 2.18 lbs), gives you 20 stone and 2.4 pounds.
The table below shows how 128 kg compares to nearby kilogram values, making it easy to see the weight in stone and pounds conversion across a range:
- 123 kg = 19st 6.8lbs
- 125 kg = 19st 10.6lbs
- 128 kg = 20st 2.4lbs
- 130 kg = 20st 6.2lbs
- 135 kg = 21st 4lbs
This stone and pounds conversion is exact and follows the standard UK measurement system.
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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 128 kg
At 128 kg, your BMI depends on your height. For example, at an average UK male height of 175cm (5ft 9in), a weight of 128 kg gives a BMI of 41.8, which falls in the severely obese (Class III) range. For an average UK female height of 162cm (5ft 4in), the same weight gives a BMI of 48.7. Both of these indicate increased health risks.
The NHS recommends a healthy BMI between 18.5 and 24.9. Even a modest weight loss of 5–10% of body weight—around 6–13 kg in your case—can bring meaningful health benefits including improved blood pressure, better blood sugar control, and reduced joint strain. Try our free weight converter above to see what different target weights look like in stone, and use our GLP-1 weight loss calculator to explore realistic outcomes with professional support.
- 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 128 kg to stone accurately?
Divide 128 by 6.35029 to get 20.17 stone. This equals 20 stone and 2.4 pounds. You can also use our free weight converter on this page for instant conversions between kg, stone, and pounds in both directions.
What is 128 kg in pounds only?
128 kg equals approximately 282.2 pounds. However, in the UK, we typically express weight using stone and pounds together (20st 2lbs) rather than pounds alone, as this is the standard measurement system used by the NHS and UK healthcare.
Is 128 kg overweight or obese according to NHS guidelines?
At 128 kg, your health category depends on your height. Use our BMI calculator above to check your personal BMI. Generally, 128 kg is in the overweight or obese range for most adults. Your GP can provide personalised guidance based on your individual height and health circumstances.
What would I weigh in stone at different kilogram values near 128 kg?
125 kg = 19st 10.6lbs, 126 kg = 19st 12.4lbs, 128 kg = 20st 2.4lbs, 130 kg = 20st 6.2lbs, 132 kg = 20st 10lbs. Use the reference table in the conversion section above for more values across the range.
How can I track weight loss from 128 kg?
Our free progress tracker allows you to log your weight in kg, stone, or pounds and monitor your journey over time. It's helpful to set small, realistic goals—the NHS recommends losing 0.5–1 kg per week for sustainable results alongside a healthy diet and increased physical activity.
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.