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 Does My Height Affect My Health and Weight?
Your height is one of the most important measurements in assessing your overall health and weight status. In the UK, height is used alongside weight to calculate your BMI (Body Mass Index) and determine whether you fall within a healthy weight range according to NHS guidance. Height also influences how weight is distributed on your body, affects your daily calorie needs, and plays a key role in identifying health risks. Whether you're tracking your fitness journey or considering weight management options, understanding how your height relates to your health is essential for making informed decisions about your wellbeing.
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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 Matters for Your Health
Your height is fundamental to calculating your BMI (Body Mass Index), which is the standard health metric used by the NHS to assess whether you're in a healthy weight range. BMI divides your weight by your height squared, meaning the same weight can represent very different BMI values depending on how tall you are. For example, 70kg is healthy for someone 1.8m tall but overweight for someone 1.6m tall. Height also determines your healthy weight range — the higher you are, the more weight your frame can naturally carry. Additionally, height influences your resting metabolic rate and daily calorie requirements, so taller individuals typically need more calories to maintain their weight. This is why personalised health assessment always considers height as a primary factor. Use our free BMI calculator above to see how your specific height and weight combine to give you a personal BMI score and NHS health category.
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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.
Height and Weight Management in the UK
When considering weight management — whether through lifestyle changes, dietary adjustments, or prescription medications like Mounjaro or Wegovy — your height is a crucial factor in determining eligibility and expected outcomes. UK weight management guidance considers your height when assessing whether you meet BMI thresholds for intervention. For example, adults with a BMI of 30 or above, or 27 or above with weight-related health conditions, may be eligible for prescription weight loss treatment. These thresholds are based on your height and weight combined. Our weight converter and GLP-1 weight loss calculator both use your height to provide personalised projections. Your GP or a qualified healthcare professional will always consider your height when assessing your individual health needs and any treatment options.
- 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.
How is my height used to calculate BMI?
BMI is calculated by dividing your weight in kilograms by your height in metres squared. The formula is BMI = weight (kg) ÷ height (m)². So a person who is 1.7m tall and weighs 70kg would have a BMI of 24.2, which falls in the healthy weight range according to NHS guidelines.
Does my height affect how much weight I should aim to lose?
Yes. Your height determines your healthy weight range according to NHS BMI categories. For example, a healthy weight for someone 1.75m tall is approximately 56–76kg, whilst for someone 1.6m tall it's approximately 47–64kg. Your GP can advise on a realistic and safe weight loss target based on your individual height, health, and circumstances.
How do I convert my height between centimetres and feet/inches?
To convert centimetres to feet and inches, divide by 30.48. For example, 175cm ÷ 30.48 = 5.74 feet, which equals 5 feet 9 inches. Use our free weight converter on this page to switch between metric and imperial measurements instantly.
Does height affect whether I'm eligible for weight loss injections like Wegovy or Mounjaro?
Height itself doesn't determine eligibility, but it affects your BMI calculation, which does. Adults with a BMI of 30 or above (or 27+ with weight-related health conditions) may be eligible. Since BMI depends on both height and weight, your height is essential in determining whether you meet NHS thresholds for prescription weight management treatment.
What's the average height for UK adults?
According to ONS data, the average UK adult man is approximately 175.3cm (5ft 9in) tall, and the average UK adult woman is approximately 161.6cm (5ft 3.5in) tall. However, healthy weight ranges apply to all heights — being taller or shorter than average doesn't affect whether your weight is healthy for your individual frame.
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.