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
Men's BMI Chart and NHS Weight Categories
A BMI chart for men shows where your weight falls within NHS health categories, from underweight through to obesity. Understanding your BMI range is a useful first step in assessing your weight-related health, though it's important to remember that BMI is a screening tool with limitations—it doesn't account for muscle mass, where fat is stored, or overall fitness. This guide explains the NHS BMI formula, the official healthy weight ranges for adult men in the UK, and what to do if you're concerned about your weight.
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 What They Mean
The NHS BMI range divides adult health into five clear categories based on your BMI score. The BMI formula is straightforward: weight in kilograms divided by height in metres squared (kg ÷ m²). For men in the UK, here's how the categories break down according to NICE guidance:
- Underweight: BMI below 18.5 — may indicate insufficient nutrition or underlying health concerns
- Healthy weight: BMI 18.5–24.9 — the recommended healthy BMI range for most adult men
- Overweight: BMI 25.0–29.9 — increased health risks including hypertension and type 2 diabetes
- Obese (Class I): BMI 30.0–34.9 — significant health risks warrant GP assessment
- Obese (Class II): BMI 35.0–39.9 — higher cardiovascular and metabolic disease risk
- Severely obese (Class III): BMI 40.0 and above — specialist medical support typically recommended
Use our free BMI calculator above to find your personal BMI instantly and see which NHS BMI category you fall into.
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 Weight Management Support and When to See Your GP
The NHS provides a structured weight management pathway designed to help men at every stage. If your BMI is above 25 or you're concerned about your weight, your first step is a conversation with your GP, who can assess your overall health, discuss any weight-related conditions like high blood pressure or prediabetes, and explain what support is available. For men with a BMI of 30 or above, or BMI 27–29.9 with weight-related health conditions, the NHS can refer you to specialist tier 3 weight management services, which may include structured programmes, dietary guidance, physical activity support, and in some cases, prescription weight loss medications. Early intervention often leads to better long-term outcomes.
BMI limitations are important to understand: BMI doesn't distinguish between muscle and fat, so athletic men with significant muscle mass may have a high BMI despite low body fat. Waist measurement is equally important—the NHS recommends men keep their waist below 94 cm (37 inches) to reduce health risk, or below 80 cm for those of South Asian heritage. Combined with your BMI, waist circumference gives a clearer picture of your health risk. Use the weight converter on this page to check your weight in stone, pounds, or kilograms, and track changes over time with our free progress tracker as you work towards your goals.
- 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 normal BMI for men according to the NHS?
The NHS defines a healthy BMI for men as 18.5 to 24.9. This range is based on reduced risk of weight-related health conditions. However, your GP can provide personalised guidance based on your age, fitness, and medical history, as BMI is a screening tool rather than a complete health assessment.
Why doesn't BMI account for muscle mass?
BMI uses only height and weight in its calculation—it cannot distinguish between muscle, fat, and bone density. This means athletes or very muscular men may have a "high" BMI despite being very fit. Waist measurement and body composition assessment provide additional useful information.
At what BMI should a man speak to his GP about weight management?
The NHS recommends discussing weight with your GP if your BMI is 25 or above, or if you have concerns about your weight regardless of BMI. If your BMI is 30 or above, or 27–29.9 with weight-related health conditions like high blood pressure or type 2 diabetes, your GP can refer you to specialist weight management services.
What is the NHS weight management pathway for men?
The NHS pathway has four tiers: tier 1 (self-help and community programmes), tier 2 (primary care-based interventions), tier 3 (specialist multidisciplinary services with possible medication), and tier 4 (bariatric surgery). Your GP assesses which tier is appropriate for you and makes referrals accordingly.
Does waist measurement matter as much as BMI?
Yes—waist circumference is equally important. The NHS recommends men keep their waist below 94 cm (37 inches) for general health, or below 80 cm for those of South Asian heritage. A larger waist indicates increased abdominal fat, which carries higher health risks even if BMI is in the normal range.
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.