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
What is 128kg in stone and pounds?
128kg converts to 20 stone 2.2 pounds (20st 2lbs) using the standard UK weight conversion formula. In purely imperial measurements, 128kg equals approximately 282 pounds. If you're looking at your weight in metric terms, understanding how this translates to stone and pounds helps you compare against NHS health guidance and track progress using familiar UK measurements. Use our free weight converter above to switch between kg, stone, and lbs instantly for any weight value.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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.
Where does 128kg sit on the BMI scale?
Your BMI at 128kg depends entirely on your height. For example, at an average UK adult height of 1.73m (5ft 8in), 128kg gives a BMI of approximately 42.8, which falls into the severely obese category (Class III) according to NHS guidelines. However, at 1.85m (6ft 1in), the same weight produces a BMI of around 37.4 (obese Class II). Use our free BMI calculator above to enter your exact height and get your personal BMI instantly. Remember that BMI is a screening tool only — it doesn't distinguish between muscle and fat, and individual health risk varies based on where weight is carried, fitness level, and medical history.
If you're at 128kg, your GP can provide personalised advice about what your weight means for your specific health and whether any interventions might be helpful.
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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.
Health considerations and next steps at 128kg
At 128kg, the NHS recommends discussing your weight with your GP. They can assess whether you have any weight-related health conditions such as type 2 diabetes, high blood pressure, or sleep apnoea. If appropriate, you may be eligible for support through NHS weight management services or prescription weight loss treatment depending on your BMI category and health profile.
Sustainable weight loss typically happens at 0.5–1kg per week through a combination of dietary changes and increased physical activity. Even a 5–10% reduction in body weight can bring meaningful health benefits. Track your progress over time using our free progress tracker, and discuss any weight management plan with your GP to ensure it's safe and tailored to your individual needs.
- 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 128kg in stone and pounds exactly?
128kg converts to 20 stone 2.2 pounds (or 20st 2lbs). This uses the standard conversion formula: divide 128 by 6.35 to get stone, then multiply the decimal portion by 14 to get pounds. Our weight converter tool above does this instantly for you.
Is 128kg considered overweight or obese according to NHS guidelines?
At 128kg, whether you're in the overweight, obese, or severely obese category depends on your height. The NHS uses BMI categories: 25–29.9 is overweight, 30–34.9 is obese Class I, 35–39.9 is Class II, and 40+ is Class III (severely obese). Calculate your personal BMI above.
What weight should I aim for if I'm 128kg?
A healthy weight range depends on your height and frame. NHS guidelines suggest a BMI between 18.5–24.9 as the target range for most adults. For example, at 1.73m (5ft 8in), healthy weight is 55–74kg. Your GP can advise on a realistic, sustainable target for your individual circumstances.
Can I get prescription weight loss medication at 128kg?
Prescription weight loss medications like Mounjaro or Wegovy may be available if you meet NHS eligibility criteria: typically a BMI of 30 or above, or 27+ with weight-related health conditions. These are prescription-only and require clinical assessment by a licensed prescriber or NHS specialist service.
How quickly can I lose weight from 128kg?
The NHS recommends losing 0.5–1kg per week for sustainable results. This typically requires a calorie deficit of around 500 kcal daily, achieved through diet and exercise combined. Very gradual weight management can increase muscle loss risk. Always consult your GP before starting a weight loss programme.
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.