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 Does 14 x 40 Mean in UK Health Measurements?
The notation "14 x 40" most commonly refers to 14 stone and 40 pounds in UK weight measurements — though this is an unusual way to express weight. In standard UK health guidance, weight is typically stated as stone and pounds combined (e.g., "14 stone 6 pounds"), or as a single kilogram figure. Understanding how different UK measurements work is essential for interpreting health advice from your GP and using NHS health tools effectively. Our BMI calculator above can help you check where your weight sits against NHS healthy weight ranges.
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.
Converting 14 Stone and Pounds to Standard Measurements
If "14 x 40" refers to 14 stone and 40 pounds, this would actually be written as 15 stone 12 pounds in correct UK notation — because 40 pounds converts to 2 stone 12 pounds (since 1 stone = 14 pounds). This combined weight is approximately 100.2 kg.
- 14 stone = 88.9 kg
- 40 pounds = 18.1 kg
- Combined (15st 12lbs) = 100.2 kg
For NHS health guidance purposes, a weight of around 100 kg is assessed using the standard BMI categories. Use our free weight converter above to switch between kg, stone, and pounds instantly — this helps when comparing your weight across different NHS guidance documents.
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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 Healthy Weight Context for This Measurement
At a weight of 100.2 kg, your BMI depends entirely on your height. For example, someone who is 1.75m (5ft 9in) tall with this weight would have a BMI of approximately 32.7, which falls into the obese (Class I) category according to NHS guidelines. However, someone who is 1.85m (6ft 1in) tall would have a BMI of around 29.3, which is in the overweight range.
The NHS recommends a healthy BMI between 18.5 and 24.9 for most adults. If you're concerned about your weight and health, your GP can provide personalised guidance based on your individual circumstances, height, and any weight-related health conditions.
- 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 does "14 x 40" mean in UK weight measurements?
"14 x 40" is an unconventional notation. If it refers to 14 stone and 40 pounds, this would correctly be expressed as 15 stone 12 pounds, or approximately 100.2 kg. Standard UK weight notation combines stone and pounds as a single figure (e.g., "15st 12lbs"), not as separate multiplicands.
How is 100 kg converted to stone and pounds?
100 kg converts to approximately 15 stone 10 pounds. To convert any weight in kg to stone and pounds, divide the kilogram figure by 6.35029 for the stone portion, then multiply the remaining decimal by 14 for pounds. Our free weight converter on this page does this instantly.
What is the BMI for someone weighing 100 kg?
BMI depends on height. At 100 kg and 1.75m tall, BMI is approximately 32.7 (obese range). At 1.85m, it's around 29.3 (overweight). Use our BMI calculator above to check your personal BMI by entering your actual height and weight.
Where does a weight of 100 kg sit in NHS healthy weight guidance?
According to NHS guidelines, a healthy weight for most adults falls within a BMI of 18.5–24.9. At 100 kg, most adults would be in the overweight or obese category depending on height. Your GP can advise on what's healthy for your individual circumstances.
Can weight loss medication help with managing weight around 100 kg?
Prescription weight loss medications like Wegovy (semaglutide) or Mounjaro (tirzepatide) may be considered for eligible adults. Eligibility depends on BMI, height, and any weight-related health conditions. Your GP or a specialist can assess whether medication is appropriate for you alongside lifestyle changes.
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.