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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BMI Ranges for Men — NHS Health Categories
Understanding your BMI range is an important first step in assessing your health. For adult men in the UK, the NHS uses standard BMI categories to help determine whether your weight falls within a healthy range for your height. Your BMI (body mass index) is calculated by dividing your weight in kilograms by your height in metres squared. Knowing where your BMI sits — and what it means — can help you and your GP have informed conversations about weight management and long-term 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.
NHS BMI Categories for Adult Men
The NHS uses four main BMI categories for adult men, based on your height and weight. These categories help identify health risks associated with excess weight:
- Healthy weight: BMI 18.5–24.9 (lowest risk group)
- Overweight: BMI 25.0–29.9 (increased health risks)
- Obese (Class I): BMI 30.0–34.9 (significant health risks)
- Obese (Class II): BMI 35.0–39.9 (high health risks)
- Severely obese (Class III): BMI 40.0+ (very high health risks)
The BMI formula is straightforward: weight (kg) ÷ height (m)². For example, a man who is 1.75m tall and weighs 80kg would have a BMI of approximately 26.1, which falls in the overweight category. This healthy BMI range of 18.5–24.9 is what NHS health professionals recommend for most adult men. However, it's important to note that BMI limitations exist — BMI does not distinguish between muscle and fat, so muscular men may have a higher BMI without excess body fat.
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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 Support and When to Seek Help
If your BMI falls outside the healthy range, your GP can offer support and advice. The NHS weight management pathway includes several tiers of support: self-help resources and community programmes (Tier 1), GP-led lifestyle interventions (Tier 2), specialist weight management services (Tier 3), and bariatric surgery for severe obesity (Tier 4). Men with a BMI of 30 or above, or BMI 27–29.9 with weight-related conditions like type 2 diabetes or high blood pressure, may be eligible for specialist support. Your GP can assess your individual situation and discuss lifestyle changes, behaviour support, or prescription options if appropriate. Using our free weight converter and BMI calculator together gives you a clear picture of your current health status and helps track progress over time.
- 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 is the healthiest BMI range for men according to the NHS?
The NHS recommends a healthy BMI range of 18.5 to 24.9 for adult men. This range represents the lowest risk for weight-related health problems. Your GP can advise if your individual situation calls for adjustments based on ethnicity, muscle mass, or existing health conditions.
At what BMI should men be concerned about their health?
Men with a BMI of 25 or above are classified as overweight or obese by NHS standards and face increased health risks. A BMI of 30+ significantly increases risk of type 2 diabetes, heart disease, and certain cancers. If your BMI is 27+ with weight-related health conditions, your GP may recommend specialist support.
Does BMI work the same for all men?
The standard BMI formula applies to adult men generally, but BMI has important limitations. It doesn't account for muscle mass — muscular or athletic men may have a high BMI with low body fat. For men of South Asian, Chinese, Black African, or Caribbean heritage, the NHS recommends lower BMI thresholds due to higher health risks at the same BMI.
How can I check if my BMI is healthy?
Calculate your BMI by dividing your weight (kg) by your height (m) squared. Alternatively, use our free BMI calculator on this page — it gives you an gradual improvement and shows which NHS category you fall into. You can also use our weight converter to check your weight in different units.
What should I do if my BMI is outside the healthy range?
Contact your GP for personalised advice. They can assess your overall health, discuss lifestyle changes like diet and exercise, and refer you to specialist NHS weight management services if appropriate. Weight loss of just 5–10% of body weight can have significant health benefits.
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.