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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Weight Height Proportion — What's Healthy for Your Height?
Your weight height proportion is a key indicator of whether your weight is appropriate for your size. In the UK, we use BMI (Body Mass Index) as the primary measure of healthy weight in relation to height. The NHS defines a healthy weight range for every height, and understanding this helps you assess your personal health. Use our free BMI calculator above to check your proportion instantly, or read on to learn how height and weight work together in health management.
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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 UK Health Guidance Measures Weight and Height
The NHS uses BMI as the standard measure of weight height proportion. BMI is calculated by dividing your weight in kilograms by your height in metres squared. A healthy BMI falls between 18.5 and 24.9 for most UK adults, though lower thresholds apply for people of South Asian, Chinese, Black African, and Black Caribbean heritage due to higher health risks at the same weight.
Your height and weight together determine your BMI category: underweight (below 18.5), healthy weight (18.5–24.9), overweight (25–29.9), obese Class I (30–34.9), obese Class II (35–39.9), or severely obese (40+). A taller person can carry more weight while maintaining a healthy BMI than a shorter person — this is why height is essential to the equation. However, BMI does not distinguish between muscle and fat, so it has limitations for athletes and very muscular individuals.
- Healthy weight range varies significantly by height
- Two people with the same weight can have very different BMIs
- Waist circumference is also important alongside BMI
- NHS guidance considers ethnicity when assessing healthy weight
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.
Finding Your Healthy Weight Range — UK Tools and Resources
To find your ideal weight height proportion, the first step is calculating your healthy weight range for your specific height. This range is determined by applying the 18.5–24.9 BMI formula to your height in metres. For example, at 1.73m (5ft 8in), a healthy weight ranges from approximately 55–74kg (8st 10lbs to 11st 10lbs).
Your GP can provide personalised guidance on a healthy weight for you, considering your individual health, muscle mass, and medical history. Use our free weight converter to switch between kg, stone, and pounds, and our BMI calculator to check your current proportion. The NHS also offers the free NHS Weight Loss Plan for additional support in achieving a healthy weight height proportion aligned with NHS health advice.
- 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 height proportion?
A healthy BMI (calculated from weight and height) falls between 18.5 and 24.9 according to NHS guidance. Your specific healthy weight depends on your height — taller people naturally carry more weight at the same BMI. Use the BMI calculator on this page to check your personal proportion instantly.
Does height affect how much you should weigh?
Yes, significantly. Height is central to calculating healthy weight. At 5ft 4in, a healthy weight range differs considerably from someone 5ft 10in. The BMI formula uses height squared, meaning taller individuals have higher healthy weight ranges. This is why two people with the same weight can have completely different BMI categories.
What if I'm very muscular — is BMI still accurate for weight height proportion?
BMI has limitations for athletic or very muscular people because it doesn't distinguish between muscle and fat. Muscle is denser than fat, so muscular individuals may have a high BMI despite low body fat. Your GP can assess whether BMI is appropriate for you or if other measurements like waist circumference are more relevant.
How do I calculate my ideal weight for my height?
Multiply your height in metres squared by 18.5 for the lower end of healthy weight, and by 24.9 for the upper end. For example, at 1.70m: (1.70 × 1.70) × 18.5 = 53.4kg, and (1.70 × 1.70) × 24.9 = 71.9kg. The NHS BMI calculator or our free BMI calculator above does this instantly.
Should I aim for the middle of my healthy weight height range?
Not necessarily. Your ideal weight depends on your individual health, genetics, muscle mass, and frame size. Some people feel best at the lower end of their healthy range, others at the upper end. Your GP or a registered dietitian can help you identify a realistic, sustainable goal within your healthy weight range.
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.