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's a Healthy BMI for Men?
BMI (body mass index) is a screening tool that helps measure whether your weight is healthy for your height. For men in the UK, the NHS uses standardised BMI categories to assess health risk. Your BMI is calculated by dividing your weight in kilograms by your height in metres squared. Understanding your BMI and how it compares to NHS guidelines is an important first step in managing your health. Use our free BMI calculator above to check your personal BMI instantly, or read on to learn how the formula works and what your result means.
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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 for Men
The NHS recognises four main BMI categories that apply equally to adult men and women:
- Healthy weight: BMI 18.5–24.9 — the NHS target range for adults
- Overweight: BMI 25.0–29.9 — increased health risks begin here
- Obese (Class I): BMI 30.0–34.9 — significant health risks
- Obese (Class II/III): BMI 35.0+ — very high health risks
The BMI formula is straightforward: weight (kg) ÷ height (m)². For example, a man weighing 80kg and 1.75m tall would have a BMI of approximately 26.1, placing him in the overweight category. NICE guidance emphasises that even modest weight loss—5–10% of body weight—can significantly improve blood pressure, cholesterol, and blood sugar control. Your GP can provide personalised advice based on your individual BMI and health history.
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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 for Men
If your BMI is 25 or above, the NHS offers a structured weight management pathway through your GP. Most people start with tier 1 support—digital tools, self-help resources, and community programmes like the NHS Weight Loss Plan. For men with a BMI of 30 or above, or 27–29.9 with weight-related conditions (high blood pressure, type 2 diabetes, heart disease), specialist tier 3 services are available through your local NHS weight management team. These services may include behaviour change coaching, dietitian support, and—where appropriate—prescription weight loss medications. Waiting times vary by region, so speak to your GP about what's available locally and your eligibility.
- 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.
How do I calculate my BMI as a man?
Use the formula: weight (kg) ÷ height (metres)². For example, 85kg ÷ (1.78)² = BMI of 26.9. You can also use our free BMI calculator above, which handles the calculation instantly and shows you which NHS category your result falls into.
Is there a different healthy BMI range for men than women?
No—the NHS BMI categories are the same for men and women. However, BMI doesn't account for muscle mass, so a muscular man may have a higher BMI without excess body fat. Your GP or a healthcare professional can assess body composition more thoroughly if needed.
What BMI should a healthy adult man aim for?
The NHS recommends a BMI of 18.5–24.9 for healthy weight. Most men fall in this range when they weigh between roughly 55–79kg at 1.75m tall (5'9"). Use our weight converter and BMI calculator to find your healthy weight range based on your exact height.
When should I talk to my GP about my BMI?
If your BMI is 25 or above, it's worth discussing with your GP, especially if you have weight-related health conditions like high blood pressure or prediabetes. Your GP can assess your overall health risk and discuss weight management options that suit you.
Does BMI have limitations for men?
Yes—BMI doesn't distinguish muscle from fat, so athletes or very muscular men may have high BMI but low body fat. BMI also doesn't account for waist circumference, which matters for health. A measurement over 102cm (40in) increases cardiovascular risk. Your GP can provide a more complete health assessment.
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.