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
Height Weight Simulator — Find Your Healthy Weight Range
A height weight simulator helps you explore what a healthy weight looks like for your specific height using UK measurements. By entering your height and current weight, you can instantly see where you fall within NHS guidelines, understand your BMI category, and discover the healthy weight range recommended for someone your height. This informational approach gives you practical context for weight management conversations with your GP or healthcare professional.
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 Weight Simulators Work
A height weight simulator uses the BMI formula — weight (kg) divided by height (metres) squared — to calculate where your weight sits relative to NHS health categories. For UK adults, a healthy BMI falls between 18.5 and 24.9, though lower thresholds apply for people of South Asian, Chinese, Black African, or Black Caribbean heritage (18.5 to 22.9). The simulator shows you the healthy weight range for your height: for example, at 5ft 8in (173cm), a healthy weight ranges from approximately 55kg (8st 10lbs) to 74kg (11st 9lbs). You can also use our free BMI calculator above to check your personal BMI instantly and understand what it means for your health. The tool highlights important context: BMI is a screening tool but doesn't account for muscle mass, where fat is stored, or individual health factors — your GP can give personalised advice about what your specific BMI means for you.
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 Healthy Weight Range Matters
Knowing your healthy weight range gives you a practical target for weight management without requiring extreme outcomes. Even modest weight loss — 5–10% of your current body weight — can significantly improve blood pressure, blood sugar control, and reduce joint strain. A simulator helps you set realistic goals: instead of focusing on an exact number, you see a range that works for your frame and height. You can also use our free weight converter to switch between kg, stone, and pounds, making it easier to understand targets set by your GP or weight management service. If you're exploring prescription weight loss options, understanding your starting point and healthy range is essential for discussing eligibility and realistic expectations with your prescriber.
- 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's the difference between a healthy weight range and an ideal weight?
A healthy weight range (based on BMI 18.5–24.9) is the evidence-based target recommended by the NHS for good health outcomes. An "ideal weight" varies by individual factors like muscle mass, bone density, and genetics. The healthy range gives you a realistic zone; your ideal weight within that range depends on your personal health goals and body composition. Always discuss what's realistic for you with your GP.
Why do South Asian and Black heritage adults have different healthy weight thresholds?
Research shows these populations face higher risk of type 2 diabetes and heart disease at lower BMI levels. The NHS recommends lower thresholds (18.5–22.9) for these groups to identify health risk earlier. A BMI of 23, for example, may carry more health risk for a South Asian adult than a European adult at the same BMI, so earlier intervention can be protective.
Can I use a height weight simulator if I'm very tall or very short?
Yes, BMI calculators work across all heights, though they're less accurate at extremes. Very tall or very short adults may find waist circumference (measured around the widest point) is also useful — the NHS recommends waist measurements as an additional health indicator alongside BMI for all adults.
Should I aim for the bottom or top of my healthy weight range?
The healthy range is broad because there's no single "perfect" weight for everyone. Where you sit within the range depends on your muscle mass, bone density, frame size, and individual health. A fitness enthusiast with significant muscle might comfortably sit at the upper end; someone with less muscle might be healthier lower. Your GP or a weight management professional can help you find your personal sweet spot.
What if my current weight is outside the healthy range — where do I start?
If your weight is above the healthy range, the NHS recommends losing 0.5–1kg per week for sustainable results. This typically requires a calorie deficit of around 500 kcal daily. If you're struggling with weight management, your GP can refer you to tier 3 specialist weight management services or discuss prescription options like GLP-1 medications if you meet eligibility criteria.
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.