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?
A normal or healthy BMI for a man is between 18.5 and 24.9, according to NHS guidelines. This range applies to adult men of all heights and represents a weight that is associated with good long-term health outcomes. However, what counts as "normal" depends on your individual height, age, and ethnic background. Use our free BMI calculator above to find your personal BMI instantly, and discover where you fall within the NHS BMI categories for men.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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 Ranges for Men
The NHS BMI formula is straightforward: weight (kg) divided by height in metres squared. For men, the BMI range categories are:
- Underweight: BMI below 18.5
- Healthy weight: BMI 18.5 to 24.9
- Overweight: BMI 25.0 to 29.9
- Obese (Class I): BMI 30.0 to 34.9
- Obese (Class II): BMI 35.0 to 39.9
- Severely obese (Class III): BMI 40.0 and above
These NHS BMI categories are based on extensive population health data. A man aged 25–35 with a BMI of 22, for example, is in the healthy range. At 6ft (183cm) tall, this corresponds to roughly 77–85kg. The overweight BMI threshold for men begins at 25.0, which is why BMI screening is important even at seemingly modest weights.
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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 What Else Matters
BMI limitations are important to understand. BMI does not distinguish between muscle and fat—a man who is very muscular or athletic may have a high BMI but low body fat percentage. BMI also does not account for where fat is stored. The NHS recommends measuring waist circumference alongside BMI: men with a waist over 94cm (37 inches) have increased health risk, and over 102cm (40 inches) have high risk, regardless of BMI. Age, family history, and fitness level all matter too. Use our free weight converter to track your weight in both kg and stone, and discuss your personal health goals with your GP for personalised guidance.
- 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 falls into the "overweight" category according to NHS guidelines, not the healthy range. The healthy BMI range for men is 18.5 to 24.9. However, BMI is just one screening tool—your GP can assess your individual health context, including fitness level, muscle mass, and any health conditions.
What is an average BMI for UK men?
The average UK adult man has a BMI of approximately 27.9, which falls in the overweight category. However, average does not mean healthy. The NHS recommends aiming for a BMI within the 18.5 to 24.9 healthy range for long-term health benefits.
Do different ethnicities have different normal BMI ranges?
Yes. The NHS recommends lower BMI thresholds for men of South Asian, Chinese, Black African, and Black Caribbean heritage due to higher health risks at lower BMI levels. For these groups, a healthy BMI range is 18.5 to 22.9, and overweight begins at 23.0.
How do I calculate my BMI as a man?
Divide your weight in kilograms by your height in metres squared. For example, at 80kg and 1.75m tall: 80 ÷ (1.75 × 1.75) = 26.1 BMI. Our BMI calculator above does this instantly—just enter your height and weight in UK measurements.
Should men worry about BMI below 18.5?
A BMI below 18.5 is classified as underweight and may indicate insufficient nutrition or muscle mass. This can be associated with weakened bone density and immune function. If your BMI is below 18.5, discuss this with your GP to rule out underlying health issues or nutritional deficiencies.
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.