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
Convert 13.4 Inches to Centimetres
13.4 inches equals 34.04 centimetres. This quick conversion helps when you're working with mixed measurement systems — common in UK health contexts where height and body measurements are often recorded in both imperial and metric units. Whether you're checking medical measurements, tracking body composition, or comparing international health data, understanding how to convert between inches and centimetres is straightforward. Use our free weight converter and BMI calculator above to explore how your measurements relate to healthy weight ranges according to NHS guidance.
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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.
How to Convert Inches to Centimetres
The conversion formula is simple: 1 inch = 2.54 centimetres exactly. To convert 13.4 inches, multiply 13.4 by 2.54, which gives you 34.036 cm (rounded to 34.04 cm). This is the standard mathematical conversion used worldwide and in all NHS health guidance.
- 13.4 inches = 34.04 cm
- Multiply inches × 2.54 to convert any measurement
- This conversion is exact — no rounding errors
- Used in UK health measurements, body composition analysis, and medical assessments
Whether measuring waist circumference, body part widths, or checking height conversions, this metric-to-imperial relationship applies consistently across all health and fitness contexts in the UK.
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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.
Why This Matters for Your Health
In UK health assessment, measurements like waist circumference matter alongside your BMI for understanding your overall health risk. The NHS emphasises that waist measurement is a better predictor of cardiovascular disease risk than BMI alone. For adults, a healthy waist circumference is typically under 94 cm for men and 80 cm for women, though these thresholds vary by ethnicity. Being able to convert between inches and centimetres helps you accurately track your own measurements and communicate clearly with your GP during health assessments. Use our BMI calculator and weight converter to get complete health context for your personal measurements and weight.
- 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 13.4 inches in centimetres?
13.4 inches equals 34.04 centimetres. The conversion uses the fixed ratio of 1 inch = 2.54 cm, which is the internationally recognised standard measurement. This conversion is exact and applies to all health, medical, and fitness measurements in the UK.
How do I convert inches to cm for health measurements?
Simply multiply the number of inches by 2.54 to get centimetres. For example, 13.4 × 2.54 = 34.04 cm. This works for any measurement including height, waist circumference, and body part measurements used in health assessments.
Why do UK health services use both inches and centimetres?
UK healthcare is transitioning to metric measurements, but many older charts and people still use imperial units. The NHS increasingly uses centimetres in clinical settings, so being able to convert between the two systems helps you communicate effectively with your GP and track health data accurately.
Is 34.04 cm a healthy waist measurement?
A waist of 34 cm is well within healthy ranges for all adults — the NHS considers waist circumference above 94 cm (men) or 80 cm (women) as indicating increased health risk. Use our BMI calculator above to check your overall health context based on your height and weight.
Where would I use a 13.4 inch measurement?
13.4 inches might represent a body measurement, the width of an object, or a distance. In health contexts, measurements this size might relate to body part widths, equipment dimensions, or specific assessment measurements. Always verify the context with your healthcare provider or the measurement system being used.
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.