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 the Healthy BMI Range for Men?
A healthy BMI range for adult men is between 18.5 and 24.9 according to NHS guidelines. This applies to most men in the UK, regardless of height. Your BMI is calculated by dividing your weight in kilograms by your height in metres squared, and it's a useful screening tool to understand whether your weight is within a healthy range. However, BMI has limitations — it doesn't distinguish between muscle and fat, so athletes or very muscular men may have a higher BMI despite being in excellent health. You can use our free BMI calculator above to check your personal BMI instantly using your height and weight.
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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 and Healthy Weight Ranges for Men
According to NHS guidelines, here are the standard BMI categories for adult men:
- 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
For a man who is 5ft 9in (175cm) tall — the approximate UK average — a healthy weight range is approximately 55 to 74kg (8st 8lbs to 11st 9lbs). For a man who is 6ft tall (183cm), the healthy range is approximately 61 to 82kg (9st 8lbs to 12st 12lbs). These figures are based on the standard BMI formula for adults. If you're unsure about your own healthy weight range, calculate your BMI using the tool on this page or speak to your GP.
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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 Why Waist Measurement Matters
While BMI is a useful initial screening tool, it has important limitations. BMI doesn't account for muscle mass, bone density, or where fat is stored on your body. A muscular man may have a high BMI but low body fat percentage and excellent cardiovascular health. The NHS also recommends measuring waist circumference alongside BMI: for men, a waist over 94cm (37 inches) indicates increased health risk, and over 102cm (40 inches) indicates high risk, regardless of BMI. For a complete picture of your health, consider using our weight converter and BMI calculator together, and discuss your results with your GP, who can provide personalised guidance based on your overall health, family history, and any existing medical conditions.
- 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 BMI the same for all adult men in the UK?
Yes, the NHS BMI categories are the same for all adult men. A healthy BMI of 18.5–24.9 applies regardless of height, age, or ethnicity — though the BMI calculation itself varies by individual height and weight. However, if you're of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends slightly lower thresholds due to higher health risk at the same BMI.
How do I calculate my healthy weight range in stone and pounds?
For any height, multiply 18.5 by your height in metres squared to get the lower healthy weight boundary, and 24.9 by the same figure for the upper boundary. The results will be in kilograms — convert to stone using our free weight converter on this page. Alternatively, use our BMI calculator to see your exact healthy range instantly.
Why does muscle mass affect BMI accuracy for men?
BMI only measures total weight relative to height — it can't distinguish between muscle and fat. Since muscle is denser than fat, a man with significant muscle mass (such as an athlete or bodybuilder) may have a BMI above 25, placing him in the "overweight" category, even though his body fat percentage is healthy. This is why waist measurement and overall health assessment matter alongside BMI.
What's the difference between overweight and obese on the BMI scale?
Overweight is a BMI of 25.0–29.9, while obese begins at BMI 30.0. The threshold at BMI 30 is where health risks from excess weight typically increase more significantly. However, individual health risk depends on many factors beyond BMI, including fitness level, diet, family history, and existing medical conditions.
Should I be concerned if my BMI is 24.9?
A BMI of 24.9 falls within the healthy range according to NHS guidelines, so it is not a cause for concern from a weight perspective. However, your overall health depends on many factors — fitness, diet, blood pressure, cholesterol, and family history all matter. If you have concerns about your health, speak to your GP for personalised advice 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.