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 Is a Healthy Weight According to the NHS?
A healthy weight according to the NHS is defined by a BMI between 18.5 and 24.9. Your ideal body weight depends on your height, age, and individual health factors. The NHS uses BMI as the primary screening tool to assess whether you're at a healthy weight range. However, it's important to understand that healthy weight isn't just about a single number — it's about how your weight affects your overall health and wellbeing. Use our free BMI calculator above to find where you currently fall on the NHS healthy weight scale.
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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.
NHS Healthy Weight Range by Height — In Stone and Kg
The healthy weight range for your height is calculated using the NHS BMI framework of 18.5–24.9. Here are common healthy weight ranges in both metric and imperial measurements:
- 5ft 4in (163cm): 50–64kg (7st 12lbs–10st 1lb)
- 5ft 6in (168cm): 54–69kg (8st 7lbs–10st 12lb)
- 5ft 8in (173cm): 58–74kg (9st 1lb–11st 9lbs)
- 5ft 10in (178cm): 62–79kg (9st 10lbs–12st 6lbs)
- 6ft (183cm): 67–85kg (10st 7lbs–13st 5lbs)
For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower thresholds — a healthy weight range starting at BMI 18.5–22.9. Your GP can provide personalised advice for your specific ethnic background and health profile.
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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 BMI
Finding your ideal weight for your height is straightforward using the BMI calculation. The weight converter tool on this page lets you switch between kg, stone, and pounds instantly. Calculate your current BMI using our free BMI calculator at the top of this page — simply enter your height and weight. If your BMI falls between 18.5 and 24.9, you're in the healthy weight range for NHS guidelines. If it's outside this range, our weight loss calculator can help you estimate realistic targets. Remember, these are screening guidelines — your GP or healthcare professional can assess what's healthy for you individually, considering muscle mass, fitness level, and medical history.
- 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 average UK weight for adults?
Average weight varies by height and sex. The average UK adult man weighs approximately 85.7kg (13st 7lbs), whilst the average woman weighs approximately 71.6kg (11st 3lbs). However, average doesn't mean healthy — your ideal weight depends on your personal height and health goals.
Is BMI the only measure of healthy weight?
No. BMI is a useful screening tool but has limitations — it doesn't distinguish between muscle and fat. Waist circumference, body composition, fitness level, and blood pressure are also important. Your GP can assess your overall health alongside BMI.
What weight should I aim for at my height?
Use the healthy weight ranges listed in the section above for your height, based on NHS BMI 18.5–24.9. Our free BMI calculator will show you the exact range for your individual height. For personalised guidance, discuss your ideal weight target with your GP.
Can my healthy weight be different from NHS guidelines?
Yes. The NHS BMI ranges are screening guidelines for most adults, but your personal healthy weight may differ due to muscle mass, athletic build, age, medications, or medical conditions. Your GP can advise what's healthy for you specifically.
How do I track progress towards a healthy weight?
Our free progress tracker lets you log your weight regularly and visualise progress over time. Aim for sustainable loss of 0.5–1kg per week. Combine realistic targets with balanced eating and physical activity — your GP or a dietitian can help you create a personalised plan.
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.