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 Should I Weigh for Your Height?
Your healthy weight depends entirely on your height, and the NHS provides clear guidelines to help you find your target range. A healthy weight for an adult is defined by a BMI (body mass index) between 18.5 and 24.9, according to NHS guidelines. However, your ideal weight also depends on factors like muscle mass, frame size, age, and ethnicity. Rather than aiming for a single "perfect" number, it's more helpful to think about a healthy weight range for your height. Use our free BMI calculator above to check where you fall and discover your personalised healthy weight range in both kilograms and stone.
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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 — UK Measurements
The table below shows the healthy weight range (BMI 18.5–24.9) for different heights, using both metric and UK measurements:
- 5ft 0in (152cm): 47–63 kg | 7st 5lbs–9st 13lbs
- 5ft 2in (157cm): 51–69 kg | 8st 0lbs–10st 13lbs
- 5ft 4in (163cm): 55–74 kg | 8st 9lbs–11st 8lbs
- 5ft 6in (168cm): 59–79 kg | 9st 4lbs–12st 6lbs
- 5ft 8in (173cm): 64–86 kg | 10st 1lbs–13st 8lbs
- 5ft 10in (178cm): 69–93 kg | 10st 13lbs–14st 9lbs
- 6ft 0in (183cm): 75–101 kg | 11st 11lbs–15st 13lbs
- 6ft 2in (188cm): 81–109 kg | 12st 11lbs–17st 2lbs
- 6ft 4in (193cm): 87–117 kg | 13st 9lbs–18st 5lbs
These figures are based on the NHS healthy weight for height standards. Your personal ideal weight for your height falls somewhere within your range — where you land depends on your individual body composition, muscle mass, and frame size.
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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.
Factors That Affect Your Healthy Weight
Your healthy weight isn't just about height — several individual factors influence what's right for you:
- Muscle mass: Muscle weighs more than fat, so athletes or very active people may have a higher healthy weight than someone sedentary at the same height.
- Frame size: People with larger bone structure naturally weigh more. Frame size is assessed by wrist circumference or family patterns.
- Age: Metabolism naturally slows with age, affecting weight distribution and maintenance.
- Ethnicity: The NHS recognises that adults of South Asian, Chinese, Black African, or Black Caribbean heritage face higher health risks at lower BMI levels — your GP may recommend a lower target weight.
- Sex: Men and women have different body compositions due to hormonal differences.
Rather than chasing a single number, focus on how you feel — energy levels, health markers from your GP, and fitness — alongside your healthy weight range for height.
- 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 BMI range (18.5–24.9) based on your height — a broad target that supports good health. Ideal weight is more personal and accounts for muscle mass, frame size, age, and other individual factors. You don't need a single "ideal" number; anywhere within your healthy weight range is good for your health.
How do I calculate my healthy weight range?
Use our free BMI calculator above — enter your height and weight to see your current BMI and your healthy weight range instantly. Alternatively, multiply your height in metres squared by 18.5 (lower limit) and 24.9 (upper limit). For example, at 1.73m tall, your healthy range is 55–74 kg.
Does muscle mass affect how much I should weigh?
Yes, significantly. Muscle is denser than fat, so someone with high muscle mass may weigh more than BMI suggests is "healthy" but still be in excellent health. If you're very active or strength train regularly, discuss your personal healthy weight with your GP rather than relying on BMI alone.
Are healthy weight ranges different for men and women?
No, the BMI healthy range (18.5–24.9) is the same for both sexes. However, women typically have more body fat at the same BMI as men due to hormonal differences. Individual health depends on overall fitness, not just weight, so discuss your personal target with your GP.
What if I'm not sure what my healthy weight should be?
Book an appointment with your GP — they can assess your individual circumstances, health markers, ethnicity-specific guidelines, and any medical conditions. You can also use our free BMI calculator to find your healthy weight range, then discuss it with your GP for personalised guidance.
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.