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 a Healthy Weight For Your Height?
Your healthy weight depends on your height, age, and body composition — not just a single number. According to NHS guidelines, a healthy weight range is defined by a BMI (body mass index) between 18.5 and 24.9. This translates to different weights for different heights. For example, an adult who is 5ft 8in tall might have a healthy weight range between roughly 8st 10lbs and 11st 10lbs (55–75kg). Your GP can give personalised advice, but our free BMI calculator above makes it easy to find your individual healthy weight range instantly.
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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.
Healthy Weight Range by Height — BMI Framework
The healthy weight range for any height is calculated using BMI (body mass index), which divides your weight in kilograms by your height in metres squared. The NHS defines a healthy BMI as 18.5–24.9, and this creates a specific weight range depending on how tall you are.
- 5ft 0in (152cm): 47–63kg (7st 6lbs – 9st 13lbs)
- 5ft 4in (163cm): 52–70kg (8st 2lbs – 11st)
- 5ft 8in (173cm): 55–75kg (8st 10lbs – 11st 10lbs)
- 5ft 10in (178cm): 59–79kg (9st 4lbs – 12st 6lbs)
- 6ft 0in (183cm): 62–83kg (9st 11lbs – 13st 1lb)
These ranges assume standard adult body composition. However, BMI has limitations — it doesn't account for muscle mass, bone density, or where fat is stored on your body. Someone very muscular might have a high BMI but low body fat.
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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.
How to Find Your Healthy Weight Using Our BMI Calculator
Rather than trying to calculate your ideal body weight manually, use our free BMI calculator on this page to find your personal healthy weight range instantly. Enter your height and current weight, and the calculator shows you where you fall on the NHS healthy weight scale — along with your specific weight target range.
For people of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower BMI thresholds: a healthy BMI starts at 18.5 but only goes up to 22.9 (not 24.9). If this applies to you, discuss your individual healthy weight with your GP, as your risk factors differ slightly.
Reaching a healthy weight is a gradual process — aim for losing no more than 0.5–1kg per week for sustainable results. Use our free progress tracker to log your weight over time and stay motivated.
- 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 difference between healthy weight and ideal weight?
Healthy weight is a range defined by BMI (18.5–24.9) that reduces disease risk for most adults. Ideal weight is more personal and varies by muscle mass, frame size, and individual health goals. Your healthy weight range is the NHS target; your ideal weight within that range depends on your body composition and how you feel.
Does healthy weight change based on age?
BMI categories don't officially change with age, but muscle naturally decreases and fat increases with ageing. This means you may need to work slightly harder to maintain a healthy BMI as you get older. Your GP can advise on age-appropriate healthy weight targets, especially after 65.
What if I'm muscular — is a high BMI unhealthy?
BMI doesn't distinguish muscle from fat, so very muscular people (athletes, bodybuilders) may have a high BMI despite low body fat. If you're very active and muscular, waist circumference and body composition are better markers than BMI alone. Discuss with your GP if you're concerned.
Is the average UK weight the same as healthy weight?
No. The average UK adult weighs around 85.7kg for men and 71.6kg for women — but many UK adults are overweight or obese (BMI ≥25). A healthy weight is defined by BMI 18.5–24.9, which is lower than the current average for most UK adults.
How do I convert my healthy weight range to stone?
Use our free weight converter on this page to switch between kilograms and stone instantly. For example, 70kg converts to 11 stone exactly. The BMI calculator also shows your healthy range in both kg and stone automatically.
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.