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 a Healthy Weight Height Proportion?
Weight height proportion is a key measure of whether your weight sits in a healthy range for your height. Unlike simple weight alone, which means little without context, your proportions indicate your overall health risk. The NHS uses BMI (body mass index) as the primary screening tool, and our free BMI calculator can instantly show you where your proportions fall within UK health thresholds. For most UK adults, a healthy weight height proportion means a BMI between 18.5 and 24.9, though ethnicity-adjusted thresholds apply for some populations.
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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 to Calculate Healthy Weight Height Proportion
The simplest way to assess weight height proportion is using BMI (body mass index), which divides your weight by your height squared. The formula is: weight (kg) ÷ height (m)². Our free weight converter and BMI calculator above can do this instantly for you.
According to NHS guidance, healthy weight height proportions fall into these categories:
- Underweight: BMI below 18.5
- Healthy weight: BMI 18.5 to 24.9
- Overweight: BMI 25.0 to 29.9
- Obese: BMI 30.0 and above
For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower thresholds: healthy weight is 18.5 to 22.9, reflecting higher cardiovascular risk at standard BMI levels. Your GP or healthcare professional can provide personalised nhs health advice for your specific ethnic background.
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 Weight Height Proportion Matters Beyond BMI
BMI is useful but has limitations — it does not distinguish between muscle and fat, so athletes may have a high BMI with low body fat. A more complete picture of weight height proportion includes waist circumference.
The NHS recommends measuring waist circumference as well:
- Men: increased risk above 94cm (37 inches); high risk above 102cm (40 inches)
- Women: increased risk above 80cm (31.5 inches); high risk above 88cm (34.5 inches)
Waist-to-height ratio is also useful: a healthy proportion is keeping your waist circumference below 0.5 times your height. This gives a more complete picture than weight alone and helps your GP assess your health risk accurately.
- 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 ideal weight height proportion for a UK adult?
According to NHS guidance, a healthy BMI (the standard measure of weight height proportion) is 18.5 to 24.9. However, the ideal weight varies by frame size, muscle mass, and individual health factors. Use our free BMI calculator to check your personal proportion, then discuss the result with your GP for context specific to your health.
How do I calculate my weight height proportion?
Use the formula: weight in kg divided by height in metres squared. Or use our free BMI calculator on this page — it calculates instantly. You can also use our weight converter to switch between stone and kg if needed, then enter your measurements into the calculator.
Does weight height proportion change with age?
Yes, healthy weight height proportions can change slightly with age. Muscle mass naturally decreases with age, so maintaining the same weight may result in a higher body fat percentage over time. The NHS BMI categories remain the same across all ages, but your GP may consider age-related factors when assessing your individual health.
Is BMI the only measure of healthy weight height proportion?
BMI is the primary screening tool but has limitations — it does not account for muscle mass or where fat is stored. Waist circumference and waist-to-height ratio provide additional insight. A healthy weight height proportion ideally shows a BMI in the healthy range plus a waist circumference within NHS recommendations for your sex.
Does weight height proportion matter if I feel healthy?
Yes. An unhealthy weight height proportion can increase disease risk even without current symptoms. Type 2 diabetes, high blood pressure, and cardiovascular disease often develop gradually without noticeable signs. Regular weight management and checking your proportion with our free BMI calculator helps your GP identify health risks early and support you with preventative nhs guidance.
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.