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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Waist to Height Ratio — What You Need to Know
Your waist to height ratio is a simple health measurement that can reveal important information about your risk of weight-related health conditions. Unlike BMI alone, it considers where fat is stored on your body — which matters because excess weight around your stomach carries greater health risks than weight distributed elsewhere. This UK health guide explains what the healthy ratio is, how to measure yours, and why your GP might use this alongside other NHS health advice.
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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 Your Waist to Height Ratio
Waist to height ratio is calculated by dividing your waist circumference by your height — both measured in the same units.
Formula: Waist circumference (cm) ÷ Height (cm) = Waist to height ratio
Example: If you are 175cm tall with a waist of 87cm: 87 ÷ 175 = 0.497
How to measure your waist correctly:
- Stand upright, relaxed, with feet shoulder-width apart
- Place a soft measuring tape horizontally around your waist at the midpoint between your lowest rib and your hip bone
- Measure at the end of a normal breath (not inhaling or holding your breath)
- Record the measurement in centimetres
- Use our free BMI calculator and weight converter above to track your measurements alongside other health metrics
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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.
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What Is a Healthy Waist to Height Ratio?
According to NHS guidance, a healthy waist to height ratio for UK adults is below 0.5. This means your waist circumference should be less than half your height. For example, if you are 180cm tall, your waist should be below 90cm.
A ratio of 0.5 or higher suggests increased health risk. This measurement is particularly useful because it identifies abdominal (central) obesity — where excess fat around the stomach is linked to higher risk of type 2 diabetes, cardiovascular disease, and other weight-related health conditions. Unlike BMI, which does not distinguish between muscle and fat, waist to height ratio specifically highlights visceral fat distribution, which is why your GP may measure both as part of NHS health assessment.
Research shows that waist to height ratio can be a better predictor of cardiovascular risk than BMI alone in some cases. You can use our free weight converter and BMI calculator above to understand your personal health context. If your ratio is 0.5 or above, discussing weight management options with your GP is worthwhile — they can advise on lifestyle changes, dietary support, or whether structured weight loss programmes or prescription support might be appropriate for you. Even a modest reduction in waist circumference (5–10%) can improve blood pressure, blood sugar control, and overall cardiovascular health.
- 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 does waist to height ratio differ from BMI?
BMI measures weight relative to height but does not account for body composition or fat distribution. Waist to height ratio specifically identifies abdominal obesity, which is a stronger predictor of cardiovascular and metabolic risk. A healthy BMI does not assures a healthy waist to height ratio — you can have a normal BMI but excess central fat. Both measurements together give your GP a fuller picture of your health.
Is waist to height ratio accurate for all adults?
Waist to height ratio is reliable for most adults but may be less accurate for very muscular individuals (like athletes), people with significant muscle loss due to age or illness, or those with certain body shapes. It is not suitable for children or pregnant women. Your GP can advise on whether this measurement is appropriate for your individual circumstances.
What if my waist to height ratio is above 0.5?
A ratio above 0.5 suggests increased health risk, particularly for cardiovascular disease and type 2 diabetes. This does not mean you will develop these conditions, but it indicates that discussing weight management with your GP is advisable. Options might include lifestyle changes, dietary support, or structured weight loss programmes — your GP can assess what is suitable for you.
Can I improve my waist to height ratio without losing overall weight?
Abdominal fat is often lost first during weight loss, so even modest weight loss (5–10% of body weight) can improve your waist to height ratio significantly. However, where you lose fat from is partly determined by genetics and individual metabolism. A combination of reduced calorie intake and increased physical activity, particularly strength training, can help reduce central fat.
Should I use waist to height ratio instead of BMI?
Both measurements are useful. BMI gives a general screening picture of weight relative to height, whilst waist to height ratio identifies where excess fat is stored — which matters for health risk assessment. The NHS recommends using both alongside waist circumference thresholds (94cm for men, 80cm for women showing increased risk). Your GP can explain what your personal measurements mean for your health. ```
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