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 in the UK?
A BMI of 23 falls comfortably within the healthy weight range according to NHS guidance. This means your weight is in a good position relative to your height, and you're at lower risk of weight-related health conditions. However, BMI is just one indicator of health—it doesn't account for muscle mass, fitness level, or where fat is stored on your body. Use our free BMI calculator above to check your personal BMI and see how your weight compares to NHS health thresholds for your height.
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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.
BMI 23 and NHS Healthy Weight Guidelines
According to NHS guidelines, a healthy BMI ranges from 18.5 to 24.9, and a BMI of 23 sits firmly within this range. This puts you in the "healthy weight" category and suggests your current weight is appropriate for your height.
- BMI 23 indicates lower risk of obesity-related conditions like type 2 diabetes, heart disease, and high blood pressure
- You're at a lower risk of joint strain, sleep apnoea, and certain weight-related cancers
- Maintaining this weight through balanced nutrition and regular physical activity supports long-term health
- For people of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends a slightly lower healthy range (18.5–22.9), so 23 may be just above the threshold—discuss with your GP if relevant
It's important to note that BMI doesn't distinguish between muscle and fat. An athlete with significant muscle mass might have a higher BMI but excellent health, while someone with the same BMI might have a different body composition. Your waist circumference and overall fitness also matter.
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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.
Maintaining Your BMI and Using UK Health Tools
If you have a BMI of 23, your priority is maintaining this healthy weight rather than losing or gaining. This means focusing on a balanced diet, regular physical activity (the NHS recommends 150 minutes of moderate aerobic activity per week), and managing stress.
Use our free weight converter to track your weight in stone, kilograms, or pounds—whatever measurement feels most natural to you. Our progress tracker helps you log changes over time and spot trends. If your BMI drifts above 25 or below 18.5, or if you have concerns about your health, speak with your GP for personalised guidance on maintaining your weight through lifestyle choices.
- 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 considered healthy in the UK?
Yes. According to NHS guidelines, a BMI between 18.5 and 24.9 is classified as healthy weight. A BMI of 23 is right in the middle of this range, indicating good weight management for your height and lower risk of weight-related diseases.
What health risks am I at with a BMI of 23?
A BMI of 23 carries minimal health risk. You have lower risk of type 2 diabetes, cardiovascular disease, high blood pressure, and certain cancers. Maintain this through balanced eating and regular physical activity to stay in this healthy zone long-term.
What's my healthy weight range if my BMI is 23?
Your specific healthy weight range depends on your height. At BMI 23, you're within the healthy range. Use our free BMI calculator above to see the full healthy weight range for your exact height and find out what weights would put you between 18.5 and 24.9 BMI.
Does BMI of 23 mean I don't need to exercise?
No. Even at a healthy BMI, regular physical activity is essential for cardiovascular health, bone strength, mental wellbeing, and disease prevention. The NHS recommends 150 minutes of moderate aerobic activity per week for all adults, regardless of BMI.
Should I try to lower my BMI below 23?
No. If your BMI is 23, your weight is healthy for your height. Losing further weight could move you toward underweight status (below 18.5), which carries its own health risks. Focus on maintaining your current weight through balanced nutrition and fitness rather than losing more weight.
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.