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
Body Height and Weight Simulator — Understanding Your Health Profile
A body height and weight simulator helps you explore how your measurements relate to health outcomes and fitness levels. Whether you're curious about healthy weight ranges, want to understand BMI in context, or are planning weight management, knowing how height and weight interact is essential. MyWeightCheck provides free tools to help you understand your personal health profile using UK measurements and NHS guidance, with no judgement — just practical information to support your wellbeing.
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 Profile
Your height and weight together determine your BMI (Body Mass Index), a key screening tool used by the NHS to assess health risk. According to NHS guidelines, a healthy BMI falls between 18.5 and 24.9 for most adults, though lower thresholds apply for South Asian, Chinese, Black African, and Black Caribbean adults due to higher health risks at the same BMI.
- At 5ft 8in (173cm), a healthy weight range is approximately 55–74 kg (8st 10lbs to 11st 10lbs)
- At 5ft 5in (165cm), healthy weight is roughly 50–67 kg (7st 12lbs to 10st 7lbs)
- At 6ft (183cm), healthy weight sits around 60–81 kg (9st 5lbs to 12st 11lbs)
BMI limitations matter: it doesn't distinguish muscle from fat, nor does it account for where fat is stored. Use our free BMI calculator to find your personal BMI instantly, then cross-reference with NHS health guidance for your age and ethnicity.
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.
Using a Weight Simulator for Health Planning
A height and weight simulator lets you explore "what-if" scenarios — seeing how different weights affect your BMI category and health risk profile. This is particularly useful when considering weight management options or setting realistic health goals.
If you're exploring weight loss, our GLP-1 weight loss calculator can help estimate potential outcomes with prescription medications like Mounjaro or Wegovy, used alongside lifestyle changes. For converting between UK measurements (stone, pounds, kilograms), use our free weight converter to work with units you're comfortable with. Remember: individual results vary, and your GP can provide personalised advice about what a healthy weight means for your specific health profile.
- 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 the healthy weight range for my height in the UK?
Healthy weight depends on your height, age, ethnicity, and muscle mass. Use the NHS BMI range of 18.5–24.9 as a starting point (lower thresholds apply for South Asian and Black African heritage). Our free BMI calculator shows your personal healthy weight range instantly based on your height. Always discuss your individual goals with your GP.
How does weight affect health outcomes?
Excess weight increases risk of type 2 diabetes, cardiovascular disease, high blood pressure, sleep apnoea, and certain cancers. Even losing 5–10% of body weight can improve blood sugar control, reduce blood pressure, and lower cholesterol. Weight management combines diet, physical activity, and sometimes medical support.
What's the difference between BMI and actual body composition?
BMI is a screening tool based on height and weight only — it doesn't distinguish muscle from fat. Two people with the same BMI can have very different body compositions. Waist circumference (NHS guidance: under 94cm for men, 80cm for women) is also important for assessing health risk.
Can I use a weight simulator to plan weight loss with medication?
Yes. Our GLP-1 weight loss calculator helps estimate potential outcomes with prescription medications like Mounjaro or Wegovy based on clinical trial data. Remember: these are estimates, individual results vary significantly, and medication requires a prescription and clinical assessment from your GP or a licensed prescriber.
How do I convert my weight between stone, pounds, and kilograms?
Use our free weight converter tool to switch instantly between kg, stone, and pounds. Common conversions: 70kg = 11st 0.1lbs, 80kg = 12st 8lbs, 90kg = 14st 2lbs. The weight converter appears on this page and is always available for quick reference.
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.