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 Male?
A normal or healthy BMI for men is between 18.5 and 24.9, according to NHS guidelines. This applies to adult men of any age. However, if you're of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends a slightly lower healthy range of 18.5 to 22.9, as these populations face higher health risks at the same BMI. Your personal healthy weight range depends on your height — use our free BMI calculator above to work out your individual target range instantly.
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 uses five BMI categories for adults:
- Below 18.5: Underweight — may need nutrition support
- 18.5–24.9: Healthy weight — the target range for most men
- 25.0–29.9: Overweight — increased health risks begin here
- 30.0–34.9: Obese (Class I) — significantly increased health risks
- 35.0 and above: Severely obese (Class II or III) — high risk of serious health conditions
These categories are used by the NHS, NICE, and UK health services to assess health risk. A healthy BMI range of 18.5–24.9 is where most men have the lowest risk of weight-related disease. The BMI formula is simple: weight in kilograms divided by height in metres squared. Our BMI calculator handles this automatically — just enter your weight and height.
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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 Support and When to Seek Help
If your BMI falls outside the healthy range, the NHS offers support through its weight management pathway. Most men start at Tier 1 — self-help using free tools like our weight converter and progress tracker. If you need more support, your GP can refer you to Tier 2 (behaviour change programmes) or Tier 3 (specialist weight management services). The NHS recognises that achieving and maintaining a healthy BMI often requires sustained lifestyle changes including diet and physical activity. Your GP can discuss what's realistic for your circumstances and any weight-related health conditions you may have. Remember, BMI has limitations — it doesn't account for muscle mass, so athletes may have a higher BMI despite low body fat.
- 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 25 BMI normal for a man?
A BMI of 25 falls into the "overweight" category according to NHS guidelines, just above the healthy range of 18.5–24.9. While not in the obese range, it indicates increased health risk compared to healthy weight. Many UK men have a BMI in this range. Your GP can advise whether weight loss is recommended based on your overall health.
What BMI should a man aim for?
The NHS recommends a healthy BMI between 18.5 and 24.9 for most men. If you're of South Asian or Black African heritage, aim for 18.5–22.9. Your exact target depends on your height and frame size. Use our free BMI calculator to find your personal healthy weight range instantly.
Why do South Asian men have different BMI thresholds?
Research shows South Asian, Chinese, Black African, and Black Caribbean populations develop type 2 diabetes and cardiovascular disease at lower BMI levels than other groups. The NHS recommends lower thresholds for these communities to catch health risks earlier and provide preventative support sooner.
Is BMI accurate for muscular men?
BMI has significant limitations for muscular individuals. It measures weight relative to height but cannot distinguish between muscle and fat. An athlete with low body fat may have a "high" BMI. For muscular men, your GP may recommend additional measures like waist circumference or body composition assessment.
What should I do if my BMI is above the healthy range?
If your BMI is above 24.9, speak with your GP, who can assess your individual health and recommend the right support. This might include lifestyle changes, weight management programmes, or specialist services. Sustainable weight loss of 0.5–1 kg per week is recommended. Small changes often 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.