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
Height to Weight Calculator — Your Healthy Weight Range
A height to weight calculator helps you determine whether your current weight falls within a healthy range for your height. Using NHS guidelines and BMI thresholds, you can discover what weight is considered healthy, overweight, or obese for your specific height. Our free BMI calculator above instantly calculates your BMI and shows where you stand — whether you're at a healthy weight or if weight management might benefit your health. Understanding the relationship between height and weight is essential for assessing your overall health risk and planning lifestyle changes if needed.
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 Height and Weight Relate to Health Risk
Your weight in relation to your height determines your Body Mass Index (BMI), which is the primary NHS screening tool for assessing whether you're at increased health risk. BMI is calculated as weight (kg) divided by height squared (m²). According to NHS guidance, a healthy BMI is between 18.5 and 24.9 for most UK adults. A BMI of 25–29.9 indicates overweight, 30–34.9 indicates obesity (Class I), and 35+ indicates severe obesity.
However, BMI has important limitations — it doesn't distinguish between muscle and fat, so athletes may have a high BMI despite low body fat. Waist circumference also matters: men should aim for under 94cm (37 inches), and women under 80cm (31.5 inches). For people of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower BMI thresholds, as these groups face higher health risks at the same weight.
Use our free weight converter above to check your weight in different units (kg, stone, and lbs), then use the BMI calculator to see your personal health category instantly.
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.
Finding Your Healthy Weight Range by Height
To calculate a healthy weight range for your height, multiply your height in metres squared by 18.5 and 24.9. For example, if you're 5ft 8in (1.73m), your healthy weight range is approximately 55–75kg (8st 8lbs to 11st 10lbs). This gives you a realistic target rather than pursuing a single "ideal" number.
If you're overweight or obese, even modest weight loss of 5–10% can significantly improve health markers like blood pressure, blood sugar control, and cholesterol. The NHS recommends gradual weight loss of 0.5–1kg per week through a combination of reduced-calorie eating and increased physical activity. If you're considering weight management options, discuss with your GP about what approach suits your health, lifestyle, and goals. Our free progress tracker can help you monitor changes over time as you work towards your healthy weight range.
- 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's the relationship between height and healthy weight?
Healthy weight depends on height because BMI (the standard NHS health metric) divides weight by height squared. Taller people naturally weigh more while remaining at the same BMI. The NHS healthy weight range (BMI 18.5–24.9) varies by height — for example, a healthy weight for someone 5ft 8in is roughly 55–75kg, while someone 6ft tall might have a healthy range of 60–82kg. Our BMI calculator shows the exact range for your height.
What weight should I be for my height UK?
Your ideal weight depends on your age, sex, muscle mass, and individual factors — there's no single "ideal" number. However, the NHS healthy weight range (BMI 18.5–24.9) gives you a target. Use our free BMI calculator above, enter your height, and it will show your healthy weight range instantly. Your GP can also advise on what's realistic for you personally, considering your health history and goals.
How accurate is height-to-weight assessment?
BMI is useful as a screening tool but has limitations. It doesn't distinguish muscle from fat — athletes may have high BMI but low body fat. It also doesn't account for where fat is stored (waist circumference matters) or factors like age, sex, or ethnicity. The NHS recommends using BMI alongside waist measurement and your individual health context, not as the only measure of health.
Can weight management help if I'm overweight?
Yes. Even 5–clinically studied weight loss can reduce blood pressure, improve blood sugar control, lower cholesterol, and reduce joint strain. The NHS recommends gradual loss of 0.5–1kg per week through diet and activity changes. If you need additional support, talk to your GP about options including weight management programmes or prescription treatments. Our progress tracker helps you monitor your journey.
What if I'm unable to lose weight with diet and exercise alone?
If lifestyle changes alone haven't worked, speak to your GP. NHS weight management services can offer specialist support, and prescription medications like GLP-1 injections (Mounjaro or Wegovy) may be an option if your BMI is 30+ or 27+ with weight-related health conditions. Our free GLP-1 weight loss calculator can help you understand potential outcomes, but a prescriber must assess suitability individually.
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.