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 Women?
A BMI of 23 for women falls comfortably within the healthy weight range according to NHS guidelines. This means your weight is proportionate to your height and generally associated with lower health risks. However, BMI is just one health indicator — your overall fitness, diet, waist circumference, and family history all contribute to your wellbeing. Use our free BMI calculator above to check your personal BMI and explore what the result means for your individual circumstances.
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
According to NHS guidance, the standard BMI range for adults divides weight into clear categories:
- Below 18.5 = Underweight
- 18.5 to 24.9 = Healthy weight (your BMI of 23 sits here)
- 25.0 to 29.9 = Overweight
- 30.0 and above = Obese
At a BMI of 23, you are in the healthy weight range — the optimal zone for most adults. The bmi formula used is weight (kg) divided by height (m) squared. For women of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends slightly lower healthy bmi thresholds (18.5 to 22.9), as these groups face higher cardiovascular and metabolic risks at the same BMI. Your GP can discuss whether these adjusted thresholds apply to you and what a healthy weight means specifically for your health profile.
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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 Support and When to Seek Advice
If you have a BMI of 23 and feel well, no action is needed — maintaining your current healthy weight is the goal. However, if you have concerns about your weight, diet, or health, your GP is always available for a conversation. The NHS weight management pathway begins in primary care: your GP can discuss your health, screen for weight-related conditions like type 2 diabetes or high blood pressure, and signpost you to community support if needed. Even at a healthy BMI, factors like bmi limitations mean your GP should consider your full health picture — family history, fitness levels, and waist circumference matter too. Use our free weight converter to track your weight across different units, and remember that maintaining a healthy lifestyle is more important than hitting a specific number.
- 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 healthy for all women?
A BMI of 23 falls in the healthy range (18.5–24.9) for most women according to NHS guidelines. However, women of South Asian, Chinese, Black African, or Black Caribbean heritage have slightly lower healthy thresholds (18.5–22.9). Your GP can advise on what's healthy for you individually, considering your ethnicity, fitness, and health history.
What is the BMI formula and how is it calculated?
BMI is calculated by dividing weight in kilograms by height in metres squared (BMI = kg ÷ m²). For example, if you weigh 60kg and are 1.65m tall: 60 ÷ (1.65)² = 22. Our free BMI calculator above does this instantly for you.
Does a BMI of 23 mean I don't need to worry about my health?
A healthy BMI is a good sign, but it's not the whole picture. Other factors matter — waist circumference, fitness level, diet quality, blood pressure, and family health history. Your GP can assess your overall health and discuss any concerns beyond BMI alone.
Can I use my BMI to calculate my ideal weight range?
Yes. For your height, the healthy weight range is typically between BMI 18.5 and 24.9. Your GP or our BMI calculator can show the exact healthy weight range for your height in both kg and stone.
Should I try to lose weight if my BMI is 23?
If your BMI is 23 and you feel well with good energy and health markers, weight loss is not necessary. Focus on maintaining your current weight through balanced diet and regular activity. If you have health concerns, speak to your GP for personalised advice.
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.