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
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Male BMI Table — NHS Weight Categories and Health Guide
A male BMI table helps you understand where your weight sits within NHS health categories. BMI (body mass index) is calculated by dividing your weight in kilograms by your height in metres squared, and it's a standard screening tool used by the NHS to assess whether an adult's weight falls within a healthy range. This guide shows you the NHS BMI categories for men, how to use the BMI formula, and what each result means for your health.
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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 — What the Numbers Mean
The NHS BMI categories apply equally to men and women. Your BMI result falls into one of five main groups:
- Below 18.5: Underweight — may indicate insufficient nutrition
- 18.5 to 24.9: Healthy weight — the target range for most adults
- 25.0 to 29.9: Overweight — increased health risks begin to rise
- 30.0 to 34.9: Obese (Class I) — elevated risk of type 2 diabetes and heart disease
- 35.0 to 39.9: Obese (Class II) — significantly higher health risks
- 40.0 and above: Severely obese (Class III) — substantial health intervention recommended
The bmi formula is straightforward: weight (kg) ÷ height (m)². You can calculate this manually or use our free BMI calculator above to get an gradual improvement. NICE guidance emphasises that BMI is a screening tool, not a diagnostic tool — your GP may want to assess other factors like waist circumference, fitness level, and family 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 Pathway — When to Seek Help
If your BMI sits outside the healthy bmi range of 18.5–24.9, or if you're in the overweight bmi threshold with weight-related health conditions, the NHS recommends speaking to your GP. The NHS offers a structured weight management pathway: Tier 1 includes self-help and digital tools (like the weight converter and BMI calculator on this page), Tier 2 involves primary care support and behaviour change programmes, and Tier 3 provides specialist multidisciplinary services where prescription weight management medications may be considered. Your GP can assess your individual circumstances and refer you to appropriate support. Bmi limitations include the fact that BMI doesn't distinguish between muscle and fat, so athletes or very muscular men may have a higher BMI despite low body fat percentage.
- 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 if I'm male?
Use the formula: weight (kg) ÷ height (metres)². For example, a man weighing 85kg and 1.75m tall would have a BMI of 85 ÷ (1.75)² = 27.8. Use our free BMI calculator above for gradual improvement without a UK pharmacy calculation.
What is a healthy BMI range for men according to the NHS?
The NHS defines a healthy BMI for men as 18.5 to 24.9. This range applies equally to all adult men regardless of age. However, BMI is just one screening tool — your GP may also consider waist circumference, fitness, and medical history.
At what BMI should a man see his GP about weight?
If your BMI is 25 or above (overweight or obese category), or if you have a BMI of 27–29.9 with weight-related health conditions like high blood pressure or type 2 diabetes, speak to your GP. They can assess whether weight management support is appropriate for you.
Why is waist circumference important alongside BMI?
Waist circumference indicates where fat is stored. For men, a waist over 94cm (37 inches) indicates increased health risk, and over 102cm (40 inches) indicates high risk — even if BMI appears borderline. The NHS recommends measuring both BMI and waist.
Does a high BMI always mean a man is unhealthy?
BMI has limitations — it doesn't distinguish muscle from fat, so very muscular or athletic men may have a higher BMI despite good health. Age, fitness level, family history, and blood pressure also matter. Your GP can provide personalised health assessment beyond BMI alone.
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.