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 126kg in Stone and Pounds?
126kg is equivalent to 19 stone and 12.6 pounds in UK measurements. However, what matters most for your health is not just the absolute weight, but your BMI — which depends on your height. At 126kg, your BMI ranges from about 20 to 29 depending on whether you are 190cm or 165cm tall. Use our free BMI calculator above to check your personal BMI instantly and see where you fall on the NHS health scale.
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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.
BMI at 126kg — Examples Across Different Heights
126kg converts to 19 stone and 12.6 pounds — but your health category depends entirely on your height. Here are examples of what your BMI would be at different heights for this weight:
- 165cm (5ft 5in): BMI of 26 — Overweight category (NHS)
- 170cm (5ft 7in): BMI of 25 — Overweight category (NHS)
- 173cm (5ft 8in): BMI of 24 — Healthy weight range (NHS)
- 175cm (5ft 9in): BMI of 23.5 — Healthy weight range (NHS)
- 180cm (5ft 11in): BMI of 22.7 — Healthy weight range (NHS)
- 185cm (6ft 1in): BMI of 21.2 — Healthy weight range (NHS)
To convert kilograms to stone accurately, divide your weight by 6.35 — so 126kg ÷ 6.35 = 19.84 stone, or 19 stone 12.6 pounds.
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
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.
NHS BMI Categories and What They Mean
The NHS uses these BMI categories for UK adults to assess health risk:
- BMI under 18.5 = Underweight
- BMI 18.5–24.9 = Healthy weight
- BMI 25–29.9 = Overweight
- BMI 30–34.9 = Obese (Class I)
- BMI 35–39.9 = Obese (Class II)
- BMI 40+ = Severely obese (Class III)
At 126kg, whether you fall into overweight or healthy weight depends on your height — taller individuals will have lower BMI scores. If you're of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower thresholds (healthy range 18.5–22.9). Use the weight converter on this page to check other weights in stone and pounds.
- 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 exactly?
126kg is 19 stone and 12.6 pounds (or approximately 19 stone 13 pounds). To convert any kilogram weight to stone, divide by 6.35. So 126 ÷ 6.35 = 19.84 stone.
Is 126kg a healthy weight?
It depends on your height. At 173cm (5ft 8in), 126kg gives a BMI of 24, which is healthy. At 165cm (5ft 5in), it gives a BMI of 26, which is overweight. Use our free BMI calculator above to find your personal BMI.
What does BMI actually measure?
BMI measures weight relative to height using the formula: weight (kg) ÷ height (m)². It's a useful screening tool but has limits — it doesn't distinguish between muscle and fat, so athletes may have high BMI despite low body fat.
How do I know if I should lose weight?
Your GP can assess your individual health. BMI is one factor, but waist measurement, fitness level, and any weight-related health conditions matter too. The NHS recommends losing weight at 0.5–1kg per week if needed.
Can I convert 126kg to pounds?
Yes — 126kg equals 277.8 pounds (or about 278 lbs). However, UK adults typically use stone and pounds together: 126kg = 19 stone 12.6 pounds. Use our weight converter tool to switch between metric and imperial instantly.
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.