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 Calculator for UK Adults
A height weight calculator helps you understand what a healthy weight range is for your individual height using NHS guidelines. In the UK, we use different measurements — stone, pounds, and kilograms — and our BMI thresholds vary if you're of South Asian, Chinese, Black African, or Black Caribbean heritage. Rather than aiming for a single "ideal" weight, NHS guidance focuses on maintaining a healthy BMI between 18.5 and 24.9. This page explains how height and weight relate to health, how to calculate your personal healthy weight range, and where to find free tools to support your weight management journey.
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 Affect Your Health
Your height and weight together determine your BMI (Body Mass Index), which is a screening tool used by the NHS to assess whether you're at a healthy weight. BMI is calculated by dividing your weight in kilograms by your height in metres squared. While BMI has limitations — it doesn't distinguish between muscle and fat, for example — it remains the primary health metric used across the UK and NHS services.
For a given height, there is a healthy weight range rather than a single target. For example, someone 5ft 8in (173cm) tall has a healthy weight range of approximately 55kg to 74kg (8st 8lbs to 11st 8lbs) according to NHS guidelines. Maintaining a weight within this range reduces your risk of type 2 diabetes, heart disease, high blood pressure, and certain cancers. Waist measurement is also important — excess weight around the middle carries particular health risks regardless of overall BMI.
It's worth noting that ethnicity affects your risk profile. The NHS recommends lower BMI thresholds for adults of South Asian, Chinese, Black African, or Black Caribbean heritage because these groups face higher cardiovascular and metabolic risks at lower BMI levels. A prescriber or GP can advise you on what's healthy for your individual background.
Clinically BackedWeight Loss
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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.
UK Tools and Resources for Weight Management
MyWeightCheck provides several free calculators to help you understand your personal health context. Use our free BMI calculator above to find your exact BMI based on your height and weight in either metric or imperial measurements. Our weight converter also helps if you're switching between stone, pounds, and kilograms — useful since UK health resources often mix these units.
If you're interested in weight management support, our GLP-1 weight loss calculator can help you explore what prescription options might achieve. For ongoing progress, our free progress tracker lets you log weight changes over time. If you have concerns about your weight or health, your GP is always your first port of call. NHS tier 3 weight management services offer evidence-based support including dietary advice, behaviour change programmes, and in some cases, prescription medication. Waiting lists vary by region, but your GP can refer you for specialist assessment.
- 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 healthy weight for my height in the UK?
A healthy BMI is between 18.5 and 24.9 according to NHS guidelines. For South Asian, Chinese, Black African, or Black Caribbean adults, the healthy range starts at 18.5 and ends at 22.9. Use the free BMI calculator on this page to find your healthy weight range based on your specific height — it will show you the minimum and maximum healthy weights in stone, pounds, and kilograms.
How is healthy weight calculated?
Healthy weight ranges are calculated using BMI (Body Mass Index). The formula is weight in kilograms divided by height in metres squared. The NHS provides safe BMI ranges for different ages and ethnic backgrounds. Rather than one "ideal" weight, you have a healthy range — for example, a 5ft 8in adult might have a healthy range of 55–74kg. Individual factors like muscle mass, frame size, and fitness level also matter.
Does height weight matter more than BMI?
BMI combines both height and weight, so they're equally important — neither matters independently. However, BMI has limitations. Two people with the same BMI can have very different body compositions depending on muscle mass. Waist circumference is also important; excess weight around the middle carries particular health risks. Your GP can assess your overall health picture beyond just height and weight.
Is there a height weight chart for the UK?
The NHS doesn't publish a single "height weight chart" because healthy weight varies by individual factors including age, sex, ethnicity, and muscle mass. Instead, the NHS uses BMI ranges. You can calculate your personal healthy weight range using our free BMI calculator on this page, which shows recommended weights for your exact height in UK measurements.
Should I aim for a specific weight or a weight range?
The NHS recommends aiming for a healthy weight range rather than a single number. This is more sustainable and accounts for natural daily fluctuations. Most people benefit from staying somewhere within their healthy BMI range (18.5–24.9) rather than targeting one exact figure. Using our free progress tracker can help you monitor trends over weeks and months rather than obsessing over daily numbers.
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.