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
Average BMI for Men in the UK
The average BMI for UK adult men is approximately 27.9, which falls into the overweight category according to NHS guidelines. However, knowing the average doesn't tell you whether your personal BMI is healthy — it simply shows where most men fall. The NHS defines a healthy BMI as between 18.5 and 24.9 for all adults. Understanding your individual BMI, using the correct BMI formula, and knowing the NHS BMI range for your height are far more important than average figures. Use our free BMI calculator above to check your personal BMI and see where you fall within the NHS health categories.
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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 BMI Categories and What They Mean
The NHS BMI categories are the standard used across UK health services. A healthy BMI is 18.5–24.9, and anything above 25 is classified as overweight or obese according to NHS guidelines. The BMI formula is weight (kg) divided by height (m) squared — this applies equally to all adults regardless of average BMI statistics.
- 18.5–24.9: Healthy weight
- 25.0–29.9: Overweight (where the average UK man currently sits)
- 30.0–34.9: Obese (Class I)
- 35.0–39.9: Obese (Class II)
- 40+: Severely obese (Class III)
For men of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower thresholds — a healthy range of 18.5–22.9. These adjustments exist because these populations face higher cardiovascular and diabetes risk at lower BMI levels. Your GP can discuss which category is most relevant for you.
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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.
NHS Weight Management Support and When to Seek Help
If your BMI falls above the healthy healthy bmi range, the NHS offers support through its tiered weight management pathway. Tier 1 includes self-help resources and digital tools like our free BMI calculator and weight converter — useful for understanding your current position. Tier 2 involves your GP, who may recommend lifestyle changes, behaviour support, or referral to specialist services. Tier 3 and 4 offer specialist multidisciplinary support, including prescription weight management options for eligible men. The NHS emphasises that even small reductions in weight — around 5–10% of your body weight — can bring meaningful health benefits. Speaking to your GP is the first step if you're concerned about your BMI or weight-related health.
- 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.
Why is the average BMI for men higher than the healthy range?
The average UK male BMI of 27.9 reflects broader population patterns influenced by diet, activity levels, and lifestyle factors. However, average does not mean healthy — the NHS still recommends a healthy BMI of 18.5–24.9. Your personal BMI is what matters for your individual health risk.
How do I calculate my personal BMI accurately?
Use the standard BMI formula: weight in kilograms divided by height in metres squared. For example, an 85kg man who is 1.75m tall has a BMI of 27.7. Our free BMI calculator above does this instantly and shows you where you fall within NHS categories.
Is BMI the only measure of health I should consider?
BMI is useful but has limitations — it doesn't distinguish muscle from fat. The NHS also recommends measuring waist circumference. Men with a waist over 102cm face increased health risk even at a moderate BMI. Speak to your GP for a complete health assessment.
What does the NHS recommend if my BMI is above 25?
The NHS suggests starting with lifestyle changes: a balanced diet with a calorie deficit of around 500 kcal daily (supporting roughly 0.5kg weekly loss) and increased physical activity. Your GP can offer behaviour support, and if eligible, referral to specialist weight management services for additional help.
Can ethnicity affect what BMI is considered healthy?
Yes. For men of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends a healthy BMI of 18.5–22.9 rather than 18.5–24.9, due to higher cardiovascular disease and diabetes risk at lower BMI levels. Discuss this with your GP if it applies to you.
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.