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
What Is Your Height Weight Ratio and Why Does It Matter?
Your height weight ratio is a simple way to assess whether your weight is healthy for your height. In the UK, we typically use BMI (body mass index) as the standard measure, but understanding how your weight relates to your height is fundamental to evaluating your overall health. The NHS uses height and weight together to determine whether you fall within a healthy range, and this relationship is far more useful than weight alone. Using our free BMI calculator, you can instantly see how your personal height and weight compare to NHS guidelines.
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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 Are Connected to Health
Your height and weight relationship determines your BMI (body mass index), which is the primary measure used by the NHS and health professionals to screen for weight-related health risks. According to NHS health advice, a healthy BMI for most UK adults falls between 18.5 and 24.9, regardless of height—the calculation automatically accounts for the difference between a 5ft 2in person and a 6ft 2in person.
- BMI 18.5–24.9: Healthy weight range
- BMI 25.0–29.9: Overweight (increased health risks)
- BMI 30.0+: Obese (higher health risks including type 2 diabetes, heart disease, high blood pressure)
For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower thresholds—healthy weight starts at BMI 18.5–22.9—because these groups face higher health risks at the same BMI levels. Use our free weight converter to switch between kg, stone, and pounds so you can work with whichever measurement feels most natural.
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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.
Using Height and Weight for Practical Health Goals
Once you know your height weight ratio, you can calculate your healthy weight range for your specific height using simple NHS formulas. For example, someone who is 5ft 8in (173cm) tall has a healthy weight range of approximately 8st 8lbs to 11st 10lbs (55–75kg). This gives you a personal target rather than a generic goal. If you're aiming for weight management, the NHS recommends losing no more than 0.5–1kg per week for sustainable results. Our weight management tools help you track progress, and if you're exploring prescription weight loss options, our GLP-1 weight loss calculator can project potential results based on clinical evidence.
- 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.
How do I calculate my height weight ratio?
Divide your weight in kilograms by your height in metres squared. For example: weight 70kg ÷ (1.75m)² = BMI 22.9. Alternatively, use our free BMI calculator on this page to calculate it instantly for your own height and weight.
What is a healthy height weight ratio for UK adults?
According to NHS guidance, a BMI of 18.5–24.9 is considered healthy for most UK adults. However, for people of South Asian, Chinese, Black African, or Black Caribbean heritage, the healthy range is 18.5–22.9 due to higher health risks at higher BMI levels.
Can height weight ratio predict health risks?
Yes. Research shows that height weight ratio (BMI) correlates with increased risk of type 2 diabetes, cardiovascular disease, certain cancers, and other conditions. However, BMI has limitations—it doesn't distinguish between muscle and fat, so athletes may have high BMI despite low body fat. Waist circumference is also important.
What if I'm taller or shorter than average—does the ratio still apply?
Yes. The BMI calculation automatically adjusts for height, so it works accurately whether you're 5ft or 6ft 3in. A 6ft person and a 5ft person can have the same BMI, but different actual weights—that's the point of using a ratio rather than a fixed weight target.
How can I improve my height weight ratio if it's unhealthy?
Sustainable weight loss involves a calorie deficit of approximately 500kcal per day (roughly 0.5kg per week loss), combined with increased physical activity. The NHS recommends consulting your GP, exploring structured programmes, and in some cases, prescription weight management options may be appropriate following clinical assessment.
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.