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 Is Normal BMI for a Man?
According to NHS guidelines, a normal or healthy BMI for a man is between 18.5 and 24.9. This BMI range applies to all UK adults regardless of gender. However, your BMI is just one measure of health — it doesn't account for muscle mass, where fat is stored, or your overall fitness. Our free BMI calculator above can help you find your personal BMI instantly, and we've included context on what your result means for your health and when to seek advice from your GP.
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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 standardised across the UK and apply to all adults over 18 years:
- Below 18.5: Underweight
- 18.5–24.9: Healthy weight (normal BMI)
- 25.0–29.9: Overweight
- 30.0–34.9: Obese (Class I)
- 35.0–39.9: Obese (Class II)
- 40.0+: Severely obese (Class III)
These bmi categories uk are based on the BMI formula: weight (kg) ÷ height (m)². A man with a BMI of 22, for example, falls comfortably within the healthy weight range. The NHS emphasises that while BMI is a useful screening tool, it has important BMI limitations — it doesn't distinguish between muscle and fat, so a muscular man may have a high BMI but low body fat. Your GP can discuss what your individual BMI means in the context of your overall health.
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.
NHS Guidance and When to Seek Help
The NHS recommends that men maintain a BMI within the healthy range (18.5–24.9) to reduce the risk of weight-related health conditions including type 2 diabetes, high blood pressure, and cardiovascular disease. If your BMI is 25 or above, your GP may suggest lifestyle changes such as a reduced-calorie diet and increased physical activity. For men with a BMI of 30 or above, or 27–29.9 with weight-related health conditions, prescription weight loss support may be available through NHS specialist weight management services. Use the weight converter on this page to check your weight in different units, then calculate your exact BMI using our free calculator to understand your personal health context.
- 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.
Is a BMI of 25 normal for a man?
A BMI of 25 is classified as overweight by NHS guidelines, not healthy weight. The healthy range is 18.5–24.9. However, "normal" in everyday terms can mean average — and many UK men have a BMI above 25. If your BMI is 25 or higher, your GP can advise on lifestyle adjustments or whether further support is needed.
What BMI should a man aim for?
The NHS recommends aiming for a BMI between 18.5 and 24.9 for optimal health. Within this range, you have the lowest risk of weight-related diseases. The specific target within that range depends on your individual health, age, fitness level, and any existing health conditions — your GP can help you set a personalised goal.
Is BMI the only measure of health?
No. BMI is a screening tool but has limitations. It doesn't account for muscle mass, bone density, or where fat is stored. Waist circumference is also important — the NHS recommends men keep waist circumference below 94cm (37 inches) for health, and below 102cm (40 inches) to reduce disease risk.
How do I calculate my BMI?
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. Use our free BMI calculator above to find your BMI instantly — it also shows you which NHS category you fall into and what it means.
What if I'm muscular — is a high BMI still a concern?
If you're muscular with a high BMI, your GP can assess your overall health more fully. They may measure waist circumference, check blood pressure, or order blood tests to understand your actual health risk. Muscle weighs more than fat, so athletes can have higher BMI but lower health risk than the BMI alone suggests.
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.