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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Health BMI for Men — NHS Guidance
Understanding your BMI (Body Mass Index) is an important first step in assessing your health and weight status. For men in the UK, the NHS provides clear BMI categories to help you understand whether your weight falls within a healthy range for your height. This guide explains what your BMI means, how it's calculated, and what the NHS recommends. You can calculate your personal BMI instantly using our free BMI calculator above to see where you stand.
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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
The NHS classifies BMI into five main categories that apply equally to men and women:
- Underweight: BMI below 18.5 — may indicate insufficient weight for your height
- Healthy weight: BMI 18.5 to 24.9 — the target range recommended by the NHS
- Overweight: BMI 25.0 to 29.9 — increased health risks begin to emerge
- Obese (Class I): BMI 30.0 to 34.9 — significant health concerns
- Severely obese (Class III): BMI 40.0 and above — requires medical attention
Your BMI formula is straightforward: weight (kg) divided by height (metres) squared. For example, a man weighing 85kg and 1.78m tall would have a BMI of approximately 26.9, placing him in the overweight category. The NHS considers a healthy BMI range of 18.5–24.9 ideal for long-term health outcomes, though individual circumstances vary.
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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 & When to Seek Help
If your BMI falls outside the healthy range, the NHS recommends discussing your options with your GP. The NHS weight management pathway begins with self-help resources and digital tools — like the weight converter and BMI calculator on this page — before progressing to specialist services if needed. Your GP can assess whether prescription weight loss support, lifestyle changes, or other interventions are appropriate for you. BMI limitations are important to remember: BMI does not distinguish between muscle and fat, so athletic men with high muscle mass may have a higher BMI despite low body fat. Your GP will consider your overall health picture, not BMI alone.
- 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 a healthy BMI for adult men in the UK?
According to NHS guidelines, a healthy BMI for men is between 18.5 and 24.9. This range applies regardless of age or ethnicity for most adult men. However, men of South Asian, Chinese, Black African, or Black Caribbean heritage may have different risk thresholds — your GP can advise if this applies to you.
How do I calculate my BMI?
Use the formula: weight (kg) ÷ height (metres)². For example, if you weigh 80kg and are 1.75m tall, your BMI is 80 ÷ (1.75 × 1.75) = 26.1. Our free BMI calculator above does this instantly — just enter your weight and height.
What should I do if my BMI is in the overweight range?
If your BMI is 25–29.9, the NHS recommends discussing this with your GP. Small changes to diet and physical activity can help, and your GP may suggest the NHS Weight Loss Plan or refer you to local weight management services. You can also use our progress tracker to monitor changes over time.
Does BMI tell the whole story about my 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 also matters: men should aim for under 94cm (37 inches). Your GP will consider your overall health, not BMI alone.
When should men be concerned about their BMI?
If your BMI is 30 or above, or 27–29.9 with weight-related health conditions (like diabetes or high blood pressure), the NHS recommends seeking GP advice. Even modest weight loss of 5–10% can improve health outcomes significantly. ```
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.