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
126kg to Stone — Healthy Weight Guide for UK Adults
126 kilograms converts to 19 stone and 12.6 pounds (or approximately 19st 13lbs). Whether this weight is healthy depends entirely on your height — the same weight can be perfectly healthy for a tall person or indicate excess weight for someone shorter. Use our free BMI calculator above to find your personal BMI, or read on to explore healthy weight ranges and what the NHS recommends for UK adults.
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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.
Healthy Weight Ranges at Different Heights
At 126kg, your health status depends on your height. The NHS uses BMI (body mass index) to assess whether weight falls within a healthy range. Here are three examples showing how the same 126kg weight translates to different health categories:
- At 5ft 8in (173cm): BMI = 42.1 (obese — above healthy range)
- At 6ft 0in (183cm): BMI = 37.6 (obese — above healthy range)
- At 6ft 4in (193cm): BMI = 33.8 (obese — above healthy range)
A healthy BMI for most UK adults is 18.5 to 24.9. At 126kg, you would need to be exceptionally tall (over 6ft 6in) to fall into this range. For context, the average UK adult man weighs around 85.7kg and the average woman around 71.6kg.
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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.
What the NHS Recommends If You're Above Healthy Weight
If you're at 126kg and above the healthy BMI range for your height, the NHS recommends gradual, sustainable weight loss of 0.5 to 1kg per week. This means a calorie deficit of around 500 kcal daily, achieved through diet and increased physical activity. Even a 5–10% reduction in body weight can bring meaningful health benefits, including lower blood pressure, improved blood sugar control, and reduced joint strain.
Your GP can assess your individual health and discuss weight management options, including lifestyle changes or prescription support if appropriate. Waist measurement also matters — for men, over 94cm indicates increased risk; for women, over 80cm. Use the weight converter on this page to track progress in your preferred units.
- 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 126kg in stone and pounds?
126kg converts to 19 stone 12.6 pounds (approximately 19st 13lbs). To convert kilograms to stone, divide the kg amount by 6.35. You can also use our free weight converter tool above to switch between metric and imperial measurements instantly.
Is 126kg a healthy weight?
It depends on your height. At 126kg, most adults would have a BMI above the healthy range (18.5–24.9). Use our free BMI calculator above to check your personal BMI, which gives a clear picture of whether your weight falls within a healthy range for your specific height.
What's the healthy weight range for my height?
Healthy weight depends on both height and sex. The NHS recommends a BMI of 18.5–24.9 for most adults. For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, a BMI of 18.5–22.9 is recommended. Calculate your specific healthy weight range using the BMI calculator on this page.
How much weight should I aim to lose if I'm at 126kg?
The NHS recommends losing 0.5–1kg per week for sustainable results. This requires a calorie deficit of around 500 kcal daily through diet and activity changes. Your GP can discuss a personalised plan. If prescription weight loss support is appropriate, you can use our GLP-1 weight loss calculator to explore projected outcomes.
What health risks are associated with being above a healthy weight?
Excess weight increases risk of type 2 diabetes, heart disease, high blood pressure, certain cancers, sleep apnoea, and joint problems. Even modest weight loss can reduce these risks significantly. Your GP can assess your individual health and discuss support options tailored to your circumstances.
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.