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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Height Weight Percentile Calculator for UK Adults
A height weight percentile calculator helps you understand how your measurements compare to other UK adults. This tool shows whether your height and weight fall within typical ranges for your age and sex, giving you context for your BMI and overall health profile. Understanding percentiles is useful alongside other health metrics like BMI and waist circumference. Use our free BMI calculator above to assess your weight in relation to your height, and refer to NHS guidance for personalised health advice.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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 Height and Weight Percentiles Work in the UK
Percentiles rank your measurements against the general population. If your height is in the 75th percentile, you are taller than 75% of UK adults of the same age and sex. Height percentiles are based on the UK90 growth reference charts, maintained by the Medical Research Council and used across NHS services. Weight percentiles follow similar population data, though weight varies more due to lifestyle, genetics, and health conditions.
- Average UK adult male height: approximately 175.3 cm (5ft 9in)
- Average UK adult female height: approximately 161.6 cm (5ft 3.5in)
- Average UK adult male weight: approximately 85.7 kg (13st 7lbs)
- Average UK adult female weight: approximately 71.6 kg (11st 3lbs)
Percentiles provide context but do not determine health status. Your GP can explain what your individual measurements mean for your health.
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.
Why Percentiles Matter for UK Health Assessment
Percentiles are more informative than raw measurements because they account for variation across age and sex. Being above or below average height does not affect health—what matters is the combination of height, weight, and body composition. BMI (body mass index) is more clinically relevant than percentiles alone because it relates weight directly to height. Use our free weight converter to see your weight in both metric and imperial units, then calculate your BMI using the BMI calculator on this page for a complete health picture. NHS guidance emphasises that healthy weight depends on individual factors including muscle mass, age, and ethnicity.
- 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 a normal height weight percentile for UK adults?
There is no single "normal" percentile—the 50th percentile is the median (average), and anything between roughly the 10th and 90th percentile is considered typical variation. Most UK adults fall between the 25th and 75th percentiles for height. Weight percentiles vary much more due to genetics, lifestyle, and health conditions.
How does percentile differ from BMI?
Percentile shows how you rank compared to the population; BMI shows the relationship between your weight and height using a formula. BMI is the NHS standard for assessing healthy weight range. A person at the 90th percentile for height and weight could have a healthy or unhealthy BMI depending on their proportions.
Should I be concerned if my child's height or weight percentile is low?
Not necessarily. Children grow at different rates. The NHS uses growth charts to track trends over time rather than single measurements. If you are concerned about your child's growth, speak to your GP or health visitor. Adult percentile calculators do not apply to children.
Can I use a percentile calculator to assess my healthy weight?
Percentile calculators provide population context but are not a substitute for BMI or medical assessment. Calculate your BMI using the tool on this page to see if your weight falls in the NHS healthy weight range for your height. Your GP can advise whether your individual weight is healthy.
Where can I find reliable UK height and weight percentile data?
The NHS, the UK Medical Research Council, and the Office for National Statistics (ONS) publish UK population data. The UK90 growth reference charts (for children) and NHS BMI guidelines (for adults) are the gold standards. MyWeightCheck provides free calculators aligned with these NHS standards.
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.