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 and Weight Simulator — Understanding Your Healthy Range
A height and weight simulator helps you explore how different weights affect your health metrics at your specific height. Whether you're curious about a healthy weight range, want to understand your current BMI, or are considering weight management options, simulating different scenarios can provide practical insights. Using UK measurements and NHS health guidance, you can see exactly how weight changes impact your health status and which interventions might be relevant for you.
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 a Height and Weight Simulator Works
A height and weight simulator allows you to input your height and different weight values to instantly see how each weight affects your BMI, health category, and overall health risk profile. Most simulators calculate your BMI using the standard formula: weight (kg) ÷ height (m)². The results then compare your simulated BMI against NHS health categories — healthy weight (18.5–24.9), overweight (25–29.9), obese (30–34.9), and severely obese (40+).
For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, lower thresholds apply (healthy range 18.5–22.9), reflecting higher cardiovascular risk at the same BMI. Rather than calculating manually, use our free BMI calculator above to simulate your height and weight instantly — simply enter your measurements and explore different weight scenarios to understand your health profile.
- Instant BMI calculation across weight ranges
- Ethnicity-adjusted health thresholds available
- Comparison against NHS healthy weight guidance
- Integration with waist circumference for fuller health context
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 Simulate Your Height and Weight?
Simulating how your weight affects your health metrics helps you set realistic weight management goals and understand what healthy weight means for your individual height. Even a 5–10% reduction in body weight can significantly improve blood pressure, blood sugar control, and cardiovascular health — you can see these thresholds by simulating weight loss scenarios. If you're considering weight management options like prescription weight loss medication (such as Mounjaro or Wegovy), simulation helps you understand eligibility criteria (typically BMI 30+, or 27+ with weight-related health conditions) and estimate potential health improvements.
Use our weight converter to switch between kg, stone, and lbs as you simulate different weights, and try our GLP-1 weight loss calculator if exploring medication options — both tools help you visualize realistic outcomes and prepare informed conversations with your GP about weight management.
- 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 weight for your height depends on your specific measurements and ethnicity. For most UK adults, a healthy BMI is 18.5–24.9 (lower for South Asian and other groups). Use our free BMI calculator above to find your exact healthy weight range — simply enter your height and see the range displayed instantly in kg, stone, and lbs.
How accurate is a height and weight simulator?
A height and weight simulator is accurate for calculating BMI and comparing against NHS health categories. However, it doesn't account for muscle mass (muscle is heavier than fat), bone density, or where fat is stored. Your GP can provide personalised health assessment beyond BMI.
Can I use a height and weight simulator to check if I'm eligible for weight loss medication?
A simulator can help you explore whether your BMI falls within typical eligibility ranges (usually 30+, or 27+ with weight-related health conditions like diabetes or high blood pressure). However, only a licensed prescriber can assess your full health picture and confirm eligibility for prescription medications like Mounjaro or Wegovy.
What's the difference between simulating weight loss and actual weight loss?
Simulation shows you the theoretical health improvements at a lower weight — it's motivational and educational. Actual weight loss requires sustained dietary changes and increased physical activity, often supported by behaviour change or medication. Our progress tracker helps you log real weight loss over time.
Should I aim for the lower or upper end of my healthy weight range?
This depends on your individual frame, muscle mass, and health goals. Aim for the range rather than a single number. Factors like waist circumference, fitness level, and how you feel physically matter more than hitting one specific weight. Your GP can guide your personal target.
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.