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
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Convert 13.6 Inches To Centimetres
13.6 inches equals 34.54 centimetres using the standard imperial to metric conversion formula. In the UK, where we use a mix of imperial and metric measurements, understanding how to convert between inches and centimetres is helpful for health monitoring, clothing sizes, and medical records. Whether you're checking waist circumference for health guidance or tracking body measurements, having accurate conversions makes it easier to compare your results against NHS health thresholds and recommendations. This guide explains the conversion and how it fits into UK health contexts.
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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.
Understanding The Inches To Centimetres Conversion
The conversion formula: One inch equals exactly 2.54 centimetres. To convert 13.6 inches to centimetres, multiply 13.6 by 2.54, which gives 34.544 cm (rounded to 34.5 cm).
In UK healthcare, centimetres are the standard measurement for body dimensions like height, waist circumference, and hip measurements. Imperial inches are less commonly used in NHS settings but appear in everyday UK life — clothing labels, furniture dimensions, and historical health records sometimes use inches. Having both measurements helps you understand your health data whether it comes from your GP, a hospital, or a personal health tracker.
- Quick reference: 13.6 inches ≈ 34.5 cm
- NHS context: Waist circumference thresholds are measured in centimetres (men: over 94 cm indicates increased health risk)
- Clothing and sizing: UK clothing often uses inches for measurements alongside metric sizes
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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.
Using UK Health Guidance And Measurement Tools
When tracking health metrics like waist circumference, NHS guidance uses centimetres as the standard. For example, a waist measurement above 94 cm (approximately 37 inches) in men or 80 cm (approximately 31.5 inches) in women is associated with increased health risk according to NHS recommendations. Converting your measurements between inches and centimetres ensures you can accurately compare against these thresholds.
Use our free BMI calculator and weight converter on this page to check your overall health metrics alongside your body measurements. If you're monitoring your health for weight management or assessing whether you might be eligible for NHS support, having accurate measurements in both metric and imperial units helps you and your GP have clearer conversations about your health. Your GP can advise on what your measurements mean for your individual health profile.
- 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 13.6 inches in centimetres exactly?
13.6 inches equals 34.544 centimetres, often rounded to 34.5 cm. The conversion uses the standard imperial-to-metric formula: inches × 2.54 = centimetres. This exact conversion is used across UK healthcare and scientific settings.
Why does the UK use both inches and centimetres?
The UK uses a mixed measurement system. Centimetres are standard in NHS healthcare (height, waist circumference, clinical measurements), whilst inches appear in everyday contexts like clothing, furniture, and historical records. Understanding both helps you navigate UK health information.
How does 13.6 inches compare to NHS waist measurement guidance?
13.6 inches (34.5 cm) is a relatively small measurement. NHS waist circumference risk thresholds are 94 cm for men and 80 cm for women. At 34.5 cm, this measurement alone wouldn't indicate health risk, but it's useful for tracking body composition changes over time.
How can I use body measurements alongside my BMI for health monitoring?
Body measurements like waist circumference provide additional health insight beyond BMI, as they show where fat is stored. Use our free BMI calculator to check your BMI, then measure your waist in centimetres using a soft tape measure, and compare against NHS guidance for a more complete health picture.
Should I ask my GP about converting my measurements between inches and centimetres?
Your GP will typically use metric measurements (centimetres) in NHS records. If you have historical measurements in inches, converting them to centimetres helps ensure consistency and makes it easier to track changes over time. Our weight converter can help with all measurement conversions.
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.