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 — UK Health Chart Explained
A BMI (body mass index) for men is calculated the same way for all adults: weight in kilograms divided by height in metres squared. The NHS BMI formula helps determine whether an adult man falls into a healthy weight range, overweight category, or obese range. This guide explains the BMI ranges for men in the UK, how to calculate your own BMI, and what your result means for your health. Use our free BMI calculator above to find your personal BMI instantly.
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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.
BMI Categories for Men — NHS Guidelines
The NHS BMI categories are the same for men and women. Here's the standard BMI range UK guide:
- Underweight: BMI below 18.5
- Healthy weight: BMI 18.5–24.9
- Overweight: BMI 25.0–29.9
- Obese (Class I): BMI 30.0–34.9
- Obese (Class II): BMI 35.0–39.9
- Severely obese (Class III): BMI 40.0 and above
The BMI formula is: weight (kg) ÷ height (m)². For example, a man weighing 80kg and 1.75m tall would have a BMI of 26.1, placing him in the overweight category. If you're of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower healthy BMI thresholds: 18.5–22.9 for healthy weight, reflecting higher health risks at standard BMI levels for these populations.
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
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 & What Else Matters
While BMI is a useful screening tool, it has important BMI limitations. It doesn't 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; men carrying excess weight around the waist face higher cardiovascular risk than those with fat distributed elsewhere. Your GP can assess your overall health picture beyond BMI. Waist circumference is also important: men with a waist over 94cm (37 inches) have increased health risk, and over 102cm (40 inches) indicates high risk. Try the weight converter on this page to check your weight in different units, then use our free BMI calculator to see where you stand.
- 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's considered a healthy BMI for men in the UK?
According to NHS guidelines, a healthy BMI is 18.5 to 24.9 for most adults, including men. However, South Asian, Chinese, Black African, and Black Caribbean men should aim for a BMI of 18.5 to 22.9, as they face higher disease risk at standard thresholds. Your GP can provide personalised advice based on your individual health.
How do I calculate my BMI?
The BMI formula is: weight in kilograms divided by height in metres squared (weight ÷ height²). For example, 80kg ÷ (1.75²) = 26.1 BMI. Use our free BMI calculator on this page to calculate your personal BMI instantly without doing the maths yourself.
What does a BMI of 30 mean for a man?
A BMI of 30 falls into the obese (Class I) category according to NHS guidelines. This suggests increased health risk, including higher likelihood of type 2 diabetes, heart disease, and high blood pressure. Your GP can assess your individual health and discuss appropriate next steps.
Is BMI accurate for muscular men?
No — BMI doesn't distinguish between muscle and fat. An athletic or very muscular man may have a high BMI but actually have low body fat and good health. In this case, waist circumference and overall fitness are better health indicators than BMI alone.
Should men aim for a different BMI than women?
No — the NHS BMI categories are identical for men and women. However, men tend to carry weight differently (more around the waist), which is why waist measurement also matters. Discuss your personal healthy weight range with your GP.
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.