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
BMI for Men — How to Calculate and Interpret Your Result
BMI (Body Mass Index) is a straightforward measurement that helps you and your GP understand whether your weight is healthy for your height. For men in the UK, BMI is calculated using a simple formula based on your weight in kilograms and height in metres. Understanding your personal BMI range is an important first step in assessing your health, though it works alongside other health measures. Use our free BMI calculator above to find your exact reading instantly, or read on to understand what your number means.
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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.
How to Calculate BMI and Understand the NHS Categories
The BMI formula is the same for all adults: divide your weight in kilograms by your height in metres squared. For example, a man weighing 85kg at 1.80m tall would calculate: 85 ÷ (1.80 × 1.80) = 26.2 BMI.
The NHS provides clear BMI categories for men and all UK adults:
- Below 18.5 — Underweight
- 18.5–24.9 — Healthy weight (recommended)
- 25.0–29.9 — Overweight
- 30.0–34.9 — Obese (Class I)
- 35.0–39.9 — Obese (Class II)
- 40.0 and above — Severely obese (Class III)
Most UK men have an average BMI around 27.9, which falls into the overweight category. Your healthy BMI range depends on your height — use our free BMI calculator to see your personal healthy weight range immediately.
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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.
BMI Limitations and Other Important Health Measures
While BMI is useful for screening, it has significant limitations. BMI limitations include that it cannot distinguish between muscle and fat — an athletic man with high muscle mass may have a high BMI but low body fat. BMI also ignores where fat is stored on your body, which matters for health risk.
The NHS recommends also measuring waist circumference for men: increased risk above 94cm (37 inches), high risk above 102cm (40 inches). Combined with your BMI, your GP can give you a complete picture of your health. Track changes over time using our free progress tracker to see meaningful improvements beyond the scale.
- 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 a healthy BMI for men?
According to the NHS, a healthy BMI for men is between 18.5 and 24.9. However, your personal healthy weight range depends on your exact height. Use our BMI calculator above to find your specific healthy weight range in stone, pounds, or kilograms.
How do I calculate my BMI as a man?
Divide your weight in kilograms by your height in metres squared. For example: 80kg ÷ (1.75m × 1.75m) = 26.1 BMI. Our free BMI calculator does this instantly — just enter your height and weight.
Why is waist measurement important alongside BMI?
Waist circumference indicates where fat is stored. Men with fat around the stomach (apple shape) face higher health risks even at the same BMI. The NHS recommends men keep waist below 94cm — discuss your personal risk with your GP.
Does high muscle mass affect BMI readings?
Yes. BMI cannot distinguish muscle from fat, so athletic men or those who strength train may have a high BMI despite low body fat. Your GP can assess your overall health using body composition and other measurements alongside BMI.
What BMI changes should I discuss with my GP?
Any significant weight gain, a BMI above 30, or weight changes alongside new symptoms should be discussed with your GP. They can assess your individual health context and discuss whether support like lifestyle advice or further investigations are needed. ```
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.