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 Correct Height and Weight for Your Health?
Your correct height and weight depend on your individual body composition, age, and overall health — not a single number. In the UK, the NHS uses BMI (body mass index) to help determine whether a weight falls within a healthy range for a given height. However, BMI is just one screening tool. This guide explains how to find your healthy weight range, what the NHS recommends, and how to interpret your measurements in a UK health context.
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.
NHS Healthy Weight Ranges for UK Adults
The NHS defines a healthy weight as a BMI between 18.5 and 24.9 for most UK adults. To find your healthy weight range for your height, you can use our free BMI calculator on this page or apply the NHS calculation formula. For example, an adult who is 5ft 8in (173cm) tall would have a healthy weight range of approximately 55–74kg (8st 8lbs to 11st 8lbs). This varies slightly for different ethnicities: adults of South Asian, Chinese, Black African, or Black Caribbean backgrounds should aim for a BMI of 18.5–22.9, as they face higher health risks at higher BMI levels according to NHS guidance.
It's important to note that BMI does not account for muscle mass. An athletic person with significant muscle may have a higher BMI but lower body fat percentage. Your GP can provide personalised advice about what weight range is appropriate for your individual health profile, medical history, and fitness level.
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.
Using UK Health Tools to Find Your Correct Weight
The most practical way to determine your correct height and weight is to use our free BMI calculator above — simply enter your height in feet and inches (or centimetres) and your current weight in stone, pounds, or kilograms. The calculator will instantly show whether your weight falls into the healthy, overweight, or obese category according to NHS guidelines. You can also use our weight converter to express your weight in different UK units (stone, pounds, kilograms) if that helps you compare against health information. If you're working towards a target weight, our free progress tracker allows you to log your weight over time and see trends. Remember: your GP remains your best source for personalised weight management guidance tailored to your specific health circumstances.
- 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 correct weight for my height in the UK?
Your correct weight depends on your individual health, fitness level, and body composition — not a fixed number. Use the NHS BMI formula: a BMI of 18.5–24.9 is considered healthy for most UK adults. For your height, your healthy weight range can be calculated using our free BMI calculator above. Your GP can advise on what's healthy for you personally.
Is BMI the only measure of correct weight?
No. BMI is a useful screening tool but has limitations — it doesn't distinguish between muscle and fat. Waist circumference is also important: men should aim for under 94cm (37in), women under 80cm (31.5in). Body composition, fitness level, and overall health matter too. Your GP can assess your individual health holistically.
Why do height and weight recommendations differ for South Asian and Black adults in the UK?
Research shows that South Asian, Chinese, Black African, and Black Caribbean adults face higher risk of type 2 diabetes and cardiovascular disease at lower BMI levels compared to European adults. The NHS recommends a healthy BMI of 18.5–22.9 for these groups instead of 18.5–24.9, based on evidence of increased health risk at higher BMI values.
How do I convert my weight into stone to check against UK health guidance?
Use our free weight converter on this page to convert between kilograms, stone, and pounds instantly. Alternatively: 1 stone equals 6.35kg, so divide your weight in kilograms by 6.35 to get stone. For example, 70kg ÷ 6.35 = approximately 11 stone. Once converted, use our BMI calculator to check your healthy weight range.
What should I do if my height and weight suggest I'm overweight according to the NHS scale?
If your BMI suggests overweight or obesity, the first step is speaking with your GP. They can assess your individual health, discuss any underlying conditions, and advise on weight management approaches including diet, physical activity, or other support. Even a 5–10% reduction in body weight can bring meaningful health benefits. NHS guidance recommends aiming for 0.5–1kg of weight loss per week for sustainable results.
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.