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
128 Kg in Stone — BMI & Health Context
At 128 kg, your BMI depends on your height. This weight converts to 20 stone 2 pounds in UK measurements. Using our free BMI calculator above, you can find your exact BMI instantly by entering your height. Once you have your BMI, you'll see which NHS health category you fall into and what this means for your wellbeing. Understanding your BMI helps you make informed health decisions alongside your GP.
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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 128 Kg Give You?
At 128 kg, your BMI ranges significantly depending on your height. Here are examples of how this weight converts across common heights:
- 5ft 2in (158 cm): BMI of 48 — Severely obese (Class III)
- 5ft 5in (165 cm): BMI of 46 — Severely obese (Class III)
- 5ft 8in (173 cm): BMI of 44 — Severely obese (Class III)
- 5ft 10in (178 cm): BMI of 42 — Severely obese (Class III)
- 6ft 0in (183 cm): BMI of 39 — Obese (Class II)
- 6ft 2in (188 cm): BMI of 37 — Obese (Class II)
These examples show that 128 kg typically falls into the obese or severely obese categories across most heights. Your GP can discuss what your personal BMI means for your health and what support options are available to you.
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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.
Understanding BMI Categories & Limitations
The NHS uses standardised BMI categories to assess weight-related health risk. A BMI of 30 or above is classified as obese, with higher numbers indicating greater risk. However, BMI has important limitations — it does not distinguish between muscle and fat, so very muscular individuals may have a high BMI without excess body fat. BMI also doesn't account for where fat is stored on your body or your age and fitness level. For a complete health picture, your GP may also consider your waist circumference and overall health history. Using our weight converter and BMI calculator together gives you a clearer understanding of your personal health context.
- 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 128 kg in stone and pounds?
128 kg converts to 20 stone 2 pounds (20st 2lbs) using the standard conversion factor. You can verify this with our free weight converter on this page, which instantly converts between kg, stone, and pounds for any weight value.
Is 128 kg overweight or obese?
At 128 kg, your health category depends on your height. For most adults, this weight falls into the obese or severely obese range according to NHS BMI categories. Your GP can assess your individual health and discuss appropriate support options.
What should I weigh at my height?
A healthy weight range depends on your height, age, and body composition. Use our free BMI calculator above to enter your height and find your healthy weight range (BMI 18.5–24.9). Your GP can also provide personalised guidance based on your medical history.
Can I use GLP-1 medication to lose weight from 128 kg?
If you have a BMI of 30 or above (which 128 kg typically indicates), you may be eligible for prescription weight loss treatment. Our GLP-1 weight loss calculator can show potential outcomes at different doses. Always consult your GP or a licensed prescriber for personalised advice on eligibility and suitability.
How accurate is BMI as a health measure?
BMI is a useful screening tool for population health but has limitations. It doesn't account for muscle mass, bone density, or where fat is stored. For a complete picture of your health, your GP may also assess waist circumference, fitness level, and medical history alongside your BMI.
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.