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's the Proper Weight for Your Height?
There's no single "perfect" weight for any height — it depends on your age, sex, muscle mass, and genetics. However, the NHS provides healthy weight ranges based on BMI (body mass index) that give you a practical target. For example, someone 5ft 8in (173cm) tall should ideally weigh between roughly 55kg and 75kg to fall in the healthy BMI range. This guide explains how to find the proper weight for your height using UK health standards and shows you how to calculate it yourself.
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.
How to Calculate Your Healthy Weight Range by Height
The simplest way to find a healthy weight for your height is using the BMI formula. The NHS recommends a BMI between 18.5 and 24.9 for most UK adults. To calculate your healthy weight range:
- Lower healthy weight: 18.5 × (height in metres)²
- Upper healthy weight: 24.9 × (height in metres)²
For example, at 1.73m (5ft 8in), your healthy weight range is 55kg to 74kg (8st 9lbs to 11st 9lbs). Use our free weight converter to switch between kg, stone, and pounds instantly. However, BMI has limitations — it doesn't account for muscle mass, so athletes may have a high BMI but low body fat. For a more complete picture, ask your GP about your personal health context.
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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.
Ethnicity and Health Weight — NHS Guidance
If you're of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends slightly lower BMI thresholds. Your healthy weight range should aim for a BMI of 18.5 to 22.9 rather than 24.9. This is because these groups face higher risk of type 2 diabetes and cardiovascular disease at the same BMI level as other populations. Ethnicity-adjusted guidance ensures more accurate health assessment across different communities. Your GP can advise whether standard or adjusted thresholds apply to you. Use our BMI calculator above to check your current BMI and see how it compares to NHS guidelines for your background.
- 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.
Is there one perfect weight for my height?
No — healthy weight varies by age, sex, muscle mass, genetics, and ethnicity. The NHS BMI range (18.5–24.9) provides a healthy target for most UK adults, but your GP can advise what's right for your individual circumstances. Weight is just one health indicator.
How do I convert my height to centimetres if I only know feet and inches?
Multiply feet by 30.48 and inches by 2.54, then add them together. For example, 5ft 8in = (5 × 30.48) + (8 × 2.54) = 173cm. Use our free weight converter for quick conversions between all UK measurements.
What if my BMI is outside the healthy range — what should I do?
Book an appointment with your GP. They can assess your overall health, discuss any weight-related health conditions, and recommend safe approaches to weight management. NHS weight management services are available through your GP's referral.
Does muscle weigh more than fat, so BMI might be inaccurate for me?
Yes — BMI doesn't distinguish between muscle and fat. Athletes or very muscular people may have a high BMI but healthy body composition. Your GP can assess whether weight alone is a concern or whether other health markers suggest you're healthy.
How much should I aim to lose per week if I'm above a healthy weight?
The NHS recommends losing 0.5 to 1kg per week for sustainable, healthy weight loss. Faster loss can happen with medical support but risks muscle loss. Your GP can advise a safe plan tailored to your health needs and circumstances.
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.