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
How Much Do I Weigh? Find Your Healthy Weight Range
Your healthy weight depends entirely on your height, and there's no single "correct" number that applies to everyone. The NHS defines a healthy weight range using BMI (Body Mass Index), which is between 18.5 and 24.9. This range accounts for the fact that people of the same height can have different body compositions based on muscle mass, frame size, and other individual factors. Rather than aiming for a specific number on the scales, it's more useful to know whether your current weight falls within the healthy weight range for your height. You can check this using our free BMI calculator above, which instantly shows you where you stand and what your healthy weight range should be.
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.
Healthy Weight Range by Height (UK Measurements)
The table below shows the healthy weight range for heights from 5ft to 6ft 3in, calculated using the NHS healthy weight BMI range of 18.5 to 24.9. Remember that these are ranges, not targets — anywhere within your personal range is healthy for you.
| Height | Healthy Weight Range |
|---|---|
| 5ft 0in (152cm) | 47–63kg (7st 6lbs – 10st 0lbs) |
| 5ft 3in (160cm) | 53–71kg (8st 5lbs – 11st 2lbs) |
| 5ft 6in (168cm) | 59–79kg (9st 3lbs – 12st 5lbs) |
| 5ft 8in (173cm) | 55–74kg (8st 10lbs – 11st 8lbs) |
| 5ft 10in (178cm) | 62–83kg (9st 10lbs – 13st 0lbs) |
| 6ft 0in (183cm) | 65–87kg (10st 3lbs – 13st 9lbs) |
Use our free weight converter above to switch between kilograms, stone, and pounds instantly if you need different units.
Clinically BackedWeight Loss
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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.
What Else Affects Your Healthy Weight?
Your healthy weight isn't just about height — several individual factors influence what's realistic and healthy for you. Muscle mass weighs more than fat, so athletes and people who strength train may weigh more than the average for their height while still being very healthy. Frame size (whether you're naturally smaller or larger boned) means some people genuinely carry more weight healthily. Age affects metabolism and muscle distribution. Ethnicity also matters: the NHS recommends lower BMI thresholds (18.5–22.9 instead of 18.5–24.9) for adults of South Asian, Chinese, Black African, or Black Caribbean backgrounds, as these groups face higher health risks at the same weight. Your GP can discuss your personal healthy weight range based on your unique health profile, rather than a one-size-fits-all number.
- 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 NHS definition of a healthy weight?
According to the NHS, a healthy weight is one that gives you a BMI (Body Mass Index) between 18.5 and 24.9. This range is based on height and applies to most UK adults. However, for people of South Asian, Chinese, Black African, or Black Caribbean backgrounds, the NHS recommends a healthy BMI between 18.5 and 22.9. Your GP can help you work out what a healthy weight means for you personally.
Can I be healthy at a weight outside the "healthy range"?
Yes, in some cases. If you have significant muscle mass from strength training or sport, you may weigh more than the typical healthy range but still be very healthy. Conversely, someone with high body fat percentage might fall within the BMI range but have health risks. BMI is a useful screening tool but doesn't account for muscle, frame size, or body composition. Your GP can assess your overall health beyond just the number on the scales.
How do I calculate my healthy weight for my height?
Use our free BMI calculator above — simply enter your height and current weight, and it will instantly show you your healthy weight range. Alternatively, multiply your height in metres by itself, then multiply by 18.5 (lower end) and 24.9 (upper end). For example, at 1.70m tall: 1.70 × 1.70 = 2.89; 2.89 × 18.5 = 53.5kg and 2.89 × 24.9 = 71.9kg.
Does my healthy weight change as I get older?
The BMI categories remain the same throughout adulthood, but your metabolic rate and muscle mass naturally change with age. As you get older, you may need to adjust diet and activity to maintain the same weight. Your GP can provide age-appropriate guidance about healthy weight and fitness for your stage of life.
What if I'm of South Asian or Black African heritage — is my healthy weight different?
The NHS recommends lower BMI thresholds for these populations: a healthy BMI of 18.5–22.9 instead of 18.5–24.9. This is because research shows these groups have higher risks of type 2 diabetes and heart disease at the same BMI as other populations. Discuss your personal healthy weight range with your GP, especially if you have other health risk factors.
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.