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 Ideal BMI for Men?
According to NHS guidance, the ideal BMI range for adult men is between 18.5 and 24.9. This range is associated with the lowest health risks for cardiovascular disease, type 2 diabetes, and other weight-related conditions. However, BMI is just one indicator of health — your individual ideal weight also depends on factors like muscle mass, age, and overall fitness. Using our free BMI calculator above, you can instantly find your personal BMI and see where it falls within the NHS guidelines.
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 Healthy Weight Standards for Men
The NHS recognises four main BMI categories for adult men:
- Underweight: BMI below 18.5 — may indicate nutritional deficiency or underlying health issues
- Healthy weight: BMI 18.5–24.9 — associated with lowest disease risk
- Overweight: BMI 25.0–29.9 — increased risk of type 2 diabetes and heart disease
- Obese: BMI 30.0 and above — significantly elevated health risks
For a man of average UK height (5ft 9in or 175cm), a healthy BMI falls within approximately 55–74 kg (8st 9lbs to 11st 9lbs). To calculate your own healthy weight range using the BMI formula, divide your weight in kilograms by your height in metres squared. The NHS recommends discussing your individual target weight with your GP, as your ideal BMI may vary based on muscle mass, age, and fitness level.
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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 into the overweight or obese range, the NHS offers support through its weight management pathway. Tier 1 support includes the free NHS Weight Loss Plan and digital tools you can access from home. If you need additional help, your GP can refer you to Tier 2 community weight management programmes, which offer structured support including diet and exercise guidance. For men with a BMI of 30 or above, or BMI 27–29.9 with weight-related conditions like high blood pressure or type 2 diabetes, specialist Tier 3 services may offer prescription weight loss medications alongside lifestyle support. Always speak with your GP about what's available in your area, as NHS services vary by region.
- 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 healthy BMI range for men according to the NHS?
The NHS defines a healthy BMI for men as 18.5–24.9. This range is based on research showing the lowest risk of weight-related diseases. A BMI below 18.5 is classed as underweight, 25–29.9 as overweight, and 30 and above as obese. Individual circumstances vary, so discuss your target weight with your GP.
How do I calculate my ideal weight for my height?
Use the BMI formula: weight (kg) ÷ height (m)². For example, a man 1.75m tall with a healthy BMI of 22 would have an ideal weight around 67kg (10st 7lbs). For precise healthy weight ranges tailored to your height, use our free BMI calculator above — it instantly shows your healthy weight band.
What are the main limitations of BMI as a health indicator?
BMI limitations include: it doesn't distinguish between muscle and fat (athletes may have high BMI but low body fat); it doesn't account for where fat is stored (waist circumference matters); and it's less accurate for older men due to muscle loss. Combine BMI with waist measurement and overall fitness for a complete picture.
When should I seek NHS help for weight management?
Contact your GP if your BMI is 30 or above, or 27–29.9 with weight-related health conditions (high blood pressure, type 2 diabetes, heart disease risk). Your GP can refer you to NHS weight management services, which may include structured programmes, dietary advice, increased physical activity plans, or in some cases, specialist medication support.
What does an "overweight" BMI threshold mean for men's health?
An overweight BMI threshold of 25.0–29.9 indicates increased risk of type 2 diabetes, high blood pressure, and cardiovascular disease compared to the healthy range. Even a modest weight loss of 5–10% can improve these risk factors. Your GP can advise whether lifestyle changes or further support would be helpful for your individual situation.
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.