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 a Healthy BMI for Men According to NHS Guidelines?
According to NHS guidance, a healthy BMI for adult men is between 18.5 and 24.9. However, your BMI is just one part of assessing overall health. The NHS also considers waist circumference, family history, and existing health conditions like type 2 diabetes or high blood pressure. If you're unsure whether your BMI falls within the healthy range, our free BMI calculator above can instantly show your personal BMI based on your height and weight. Your GP can then provide personalised advice about what your individual BMI means for your health.
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 Thresholds for Men
The NHS uses standardised BMI categories for all adults, including men:
- Underweight: BMI below 18.5
- Healthy weight: BMI 18.5 to 24.9 (target range)
- Overweight: BMI 25.0 to 29.9
- Obese (Class I): BMI 30.0 to 34.9
- Obese (Class II): BMI 35.0 to 39.9
- Severely obese (Class III): BMI 40.0 and above
These categories apply to men aged 18 and over. Men of South Asian, Chinese, Black African, or Black Caribbean heritage may have different risk profiles at the same BMI — your GP can discuss this with you. The BMI formula is straightforward: weight in kilograms divided by height in metres squared. For a man 1.75m tall, a healthy weight would be approximately 56–76 kg (8st 11lbs to 11st 13lbs using the UK stone conversion). This reflects the healthy BMI range for that height.
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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
The NHS offers support across four tiers if your BMI is above the healthy range. Tier 1 includes self-help resources and digital tools — such as our free weight converter and BMI calculator — to help you understand your current health metrics. Tier 2 provides primary care-based behaviour change programmes through your GP surgery. If needed, Tier 3 offers specialist multidisciplinary weight management services, where prescription weight loss medications may be considered following clinical assessment. NICE guidance recommends that men with a BMI of 30 or above, or 27–29.9 with weight-related conditions, discuss weight management options with their GP. Even modest weight loss of 5–10% of body weight can meaningfully improve blood pressure, blood sugar control, and cardiovascular health.
- 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 a BMI of 25 healthy for men according to NHS guidelines?
A BMI of 25 falls in the overweight category (25.0–29.9) according to NHS standards. The healthy range is 18.5–24.9. However, BMI is a screening tool and doesn't account for muscle mass. Someone with significant muscle may have a higher BMI but lower body fat. Your GP can assess your overall health picture beyond BMI alone.
What BMI should a man aged 40 aim for?
The NHS healthy BMI range of 18.5–24.9 applies to all adult men regardless of age. However, older men may naturally lose muscle mass over time. Your GP can advise on a healthy weight for your individual age, fitness level, and any existing health conditions. Use our BMI calculator to check where you currently stand.
Does the NHS BMI calculator differ from private calculators?
The BMI formula is universal — weight (kg) ÷ height (m)². The NHS uses the same calculation. What differs is context: the NHS provides clinical interpretation against NHS categories and considers ethnicity, waist circumference, and health conditions. Our free BMI calculator on this page uses NHS thresholds for accuracy and UK measurements.
When should a man with BMI 28 contact his GP?
A BMI of 28 is in the overweight range. The NHS recommends contacting your GP if you have overweight BMI plus any weight-related health condition — such as prediabetes, high blood pressure, or sleep apnoea — even if BMI is below 30. Your GP can assess your individual risk and discuss weight management options.
What are the limitations of BMI for men's health?
BMI doesn't distinguish between muscle and fat — athletes may have high BMI but be healthy. It also ignores where fat is stored; waist circumference is important too. BMI is less accurate for very tall men and doesn't account for bone density or individual metabolic differences. Your GP uses BMI alongside other health markers for a complete picture.
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.