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 Centimetres to Kilograms — UK Health Information
Centimetres and kilograms measure different things — height and weight — so they cannot be directly converted into each other. However, both measurements are essential for UK health assessment. Your height in centimetres and your weight in kilograms together determine your BMI, which is how the NHS assesses whether you're in a healthy weight range. This guide explains how these measurements work together in UK health guidance, and how to use them to understand your personal health context. Use our free BMI calculator to instantly check your BMI at your current height and weight.
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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.
Why Height and Weight Are Both Important for Health
Height (measured in centimetres) and weight (measured in kilograms) are two separate measurements that work together to assess health risk. Height alone tells us nothing about health — you need both measurements to calculate BMI, which is the NHS standard screening tool for excess weight.
The BMI formula is: weight (kg) ÷ height (m)². To use this, convert your height from centimetres to metres (divide by 100). For example, if you are 170cm tall, that is 1.70 metres. If you weigh 75kg, your BMI is 75 ÷ (1.70)² = 25.95, which falls into the overweight category according to NHS guidelines.
- Height ranges for adults typically span 150–195cm
- Weight varies hugely based on height, muscle mass, age, and other factors
- The same weight means completely different things at different heights
- NHS uses both measurements together to assess health risk
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.
Finding Your Healthy Weight Range Using Height and Weight
Once you know your height in centimetres, you can calculate the healthy weight range for that height using NHS BMI categories. The healthy BMI range is 18.5 to 24.9 for most UK adults (slightly lower for South Asian, Chinese, Black African, and Black Caribbean adults).
To find your healthy weight range: multiply your height in metres by itself, then multiply by 18.5 and by 24.9. For example, at 170cm (1.70m), healthy weight is between 53.4kg (8st 5lbs) and 72.0kg (11st 5lbs). Use our free weight converter to check any weight in stone and pounds, and try our BMI calculator to check your personal BMI instantly. Remember that healthy weight is a range, not a single number — individual health varies based on muscle mass, age, and other factors.
- 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 directly convert centimetres to kilograms?
No. Centimetres measure height and kilograms measure weight — they are different properties. You cannot convert one to the other. However, height and weight together determine your BMI, which is the NHS health screening tool. Both measurements are needed to assess health risk.
How do I calculate BMI using height in centimetres and weight in kilograms?
The formula is: weight (kg) ÷ height (m)². First convert your height from centimetres to metres (divide by 100). For example, 175cm = 1.75m. Then divide your weight by the square of your height. If you weigh 80kg and are 1.75m tall: 80 ÷ (1.75)² = 26.1 BMI.
What is the healthy weight range for someone 170cm tall?
At 170cm (1.70m), using NHS BMI guidelines, the healthy weight range is approximately 53.4kg to 72.0kg (8st 5lbs to 11st 5lbs). Individual healthy weight depends on muscle mass, age, and frame size. Your GP can give personalised advice about what's healthy for you.
Why does the NHS use both height and weight measurements?
Height and weight together calculate BMI, which screens for health risks linked to excess weight. Height alone means nothing — the same weight is healthy at different heights. Weight alone ignores how tall you are. Combined, they give a better picture of whether your weight poses health risks like type 2 diabetes or cardiovascular disease.
Do centimetres and kilograms apply to all UK health assessments?
The NHS primarily uses kilograms for weight and centimetres for height in clinical settings. However, UK adults often think in stone and pounds for body weight. Our site provides free tools to convert between all units, and always reference NHS BMI thresholds which are based on kg and metres.
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.