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 Does a BMI of 23 Mean for Men?
A BMI of 23 falls squarely within the NHS healthy weight range for adults. For men, this BMI indicates you're at a healthy weight and at lower risk of weight-related health conditions like type 2 diabetes, high blood pressure, and heart disease. BMI is a useful screening tool, but it's just one part of the picture — your overall fitness, muscle mass, and waist measurement also matter. Use our free BMI calculator to check your personal BMI and see where you fall on the UK health scale.
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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.
How BMI 23 Fits Into the NHS BMI Categories
According to NHS guidelines, the BMI formula divides your weight in kilograms by your height in metres squared. A BMI of 23 falls in the healthy weight range of 18.5 to 24.9, which is the target zone for UK adults. This means your weight is proportionate to your height and you're at lower risk for obesity-related health conditions.
- BMI below 18.5: Underweight
- BMI 18.5–24.9: Healthy weight (your range)
- BMI 25.0–29.9: Overweight
- BMI 30.0+: Obese
For men of South Asian, Chinese, Black African, or Black Caribbean descent, the NHS recommends a slightly lower healthy threshold (18.5–22.9), so context matters. Calculate your exact BMI using the BMI calculator on this page to see your specific number and healthy weight range.
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.
BMI Limitations and What Else Matters
While a BMI of 23 is reassuring, BMI has important limitations you should understand. It doesn't distinguish between muscle and fat — an athlete with high muscle mass might have a higher BMI but lower body fat. BMI also doesn't show where fat is stored, which matters for health.
The NHS recommends also checking your waist circumference: men should aim for under 94cm (37 inches) for health, with increased risk above 102cm (40 inches). Combined with regular physical activity and a balanced diet, a healthy BMI of 23 suggests you're managing your weight well.
- 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 23 good for a man?
Yes, a BMI of 23 is considered healthy for men according to NHS guidelines. It falls comfortably within the healthy weight range of 18.5–24.9, suggesting lower risk of weight-related health conditions. However, BMI is just one health marker — fitness, muscle mass, and waist measurement also matter.
What weight should a man be with a BMI of 23?
This depends on your height. For example, at 1.75m (5ft 9in), a BMI of 23 equals approximately 70kg (11 stone). At 1.80m (5ft 11in), it's about 74kg (11 stone 8lbs). Use our weight converter to calculate your exact target weight for your height.
Should I try to lose weight if my BMI is 23?
No. A BMI of 23 is in the healthy range, so weight loss is not medically necessary. Focus instead on maintaining your current weight through balanced nutrition and regular physical activity. Your GP can advise if any changes are needed for your individual health.
How is BMI calculated?
BMI is calculated using the formula: weight (kg) divided by height (m) squared. For example, if you weigh 70kg and are 1.75m tall: 70 ÷ (1.75²) = 22.9. Our BMI calculator does this instantly — just enter your weight and height.
What's the difference between BMI and body fat percentage?
BMI measures weight relative to height, while body fat percentage measures the actual proportion of fat in your body. A man with a BMI of 23 might have varying body fat depending on muscle mass. Both metrics together give a clearer picture of health than BMI alone.
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.