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
How to Convert Centimetres to Kilograms — UK Guide
Converting centimetres to kilograms isn't a direct conversion—cm measures height while kg measures weight. However, understanding the relationship between your height (in cm) and weight (in kg) is essential for UK health guidance. The NHS uses both measurements together to calculate BMI and assess healthy weight ranges. This guide explains how these two measurements work together to support your health assessment and help you understand whether your weight is healthy for your height.
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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.
Height and Weight: How They Work Together for UK Health
Centimetres measure height, whilst kilograms measure weight—they cannot be converted directly into each other. Instead, the NHS combines these measurements to assess your health.
- Height in cm: How tall you are (e.g. 170 cm = 5ft 7in)
- Weight in kg: How much you weigh (e.g. 75 kg = 11st 11lbs)
- Together they create BMI: BMI = weight (kg) ÷ height (metres)²
For example, someone who is 170 cm tall and weighs 75 kg has a BMI of approximately 26, which falls into the overweight category according to NHS guidance. The same weight would have a different BMI significance for someone who is 180 cm tall. This is why both measurements matter—they show whether your weight is healthy for your specific height.
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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 Tools to Check Your Health at Your Height
Rather than converting cm to kg directly, the NHS recommends using BMI assessment to understand what a healthy weight is at your height. Use our free BMI calculator above to enter your height in centimetres and weight in kilograms—it will instantly show you whether you fall into the healthy, overweight, or obese range for UK guidance.
Your GP can also provide personalised health advice based on your specific height, weight, and health history. If you're managing your weight or exploring weight loss options, understanding your current BMI at your height is an excellent starting point. This helps inform conversations with your healthcare provider about any health goals.
- 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.
Can I convert cm directly to kg?
No, centimetres and kilograms measure different things—height and weight respectively. They cannot be converted directly. However, the NHS combines both measurements to calculate BMI, which shows whether your weight is healthy for your height. Use our BMI calculator to see your personal BMI instantly.
What's the healthy weight range for my height in cm?
Healthy weight depends on your specific height. For example, a healthy weight for someone 165 cm tall is approximately 50–68 kg (7st 12lbs to 10st 9lbs). For 175 cm, it's roughly 56–77 kg (8st 11lbs to 12st 1lb). Enter your measurements into our free BMI calculator to find your personalised healthy weight range.
How do I know if my weight is healthy for my height?
The NHS uses BMI to assess this. A healthy BMI is 18.5–24.9 regardless of height—your specific healthy weight range in kg depends on your height in cm. Our BMI calculator combines your height and weight instantly. If you're concerned about your health, your GP can provide personalised guidance.
Is there a formula to calculate healthy weight from height?
Yes. A simple formula is: healthy weight range = BMI 18.5 to 24.9 multiplied by your height (metres)². For someone 170 cm (1.7 metres) tall: lower bound = 18.5 × (1.7)² = 53.4 kg; upper bound = 24.9 × (1.7)² = 71.8 kg. Our weight converter and BMI calculator do this instantly for you.
Why does the NHS measure both height and weight?
Height and weight together determine BMI, which is the NHS's primary screening tool for assessing whether someone has a healthy weight. Weight alone doesn't tell the full story—the same weight means something different for someone who is 160 cm tall versus 190 cm tall. Both measurements are essential for UK health guidance and assessment.
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.