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
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NHS BMI Chart for Women: Understanding Your Healthy Weight Range
The NHS BMI chart for women shows where your weight falls within standard health categories. If you're wondering whether your weight is healthy, the NHS BMI categories provide a clear framework: underweight (below 18.5), healthy weight (18.5–24.9), overweight (25.0–29.9), and obese (30.0 and above). However, the NHS also recognises that women of South Asian, Chinese, Black African, or Black Caribbean heritage should use lower BMI thresholds due to higher health risks at lower weights. This guide explains the chart, how to calculate your BMI, and why BMI is just one part of assessing 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 Healthy Weight Ranges for Women
The NHS BMI chart for women uses the same BMI formula as for men: weight (kg) divided by height (m) squared. However, healthy BMI thresholds may differ based on ethnicity. For most UK women, the standard bmi range uk categories are:
- Underweight: BMI below 18.5
- Healthy weight: BMI 18.5–24.9
- Overweight: BMI 25.0–29.9
- Obese (Class I): BMI 30.0–34.9
- Obese (Class II): BMI 35.0–39.9
- Severely obese: BMI 40.0 and above
For women of South Asian, Chinese, Black African, or Black Caribbean backgrounds, the overweight bmi threshold begins at BMI 23.0, and obesity begins at BMI 27.5. This adjustment reflects research showing these groups face greater health risks at lower BMI levels. Use our free BMI calculator above to find your personal BMI instantly and see which category you fall into.
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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.
BMI Limitations and Other Important Health Measures
BMI limitations are important to understand. BMI does not distinguish between muscle and fat—athletes or very muscular women may have a high BMI but low body fat. BMI also ignores where fat is stored; excess belly fat carries higher health risks than fat stored elsewhere. Age, bone density, and pregnancy also affect BMI accuracy. Alongside BMI, the NHS recommends checking your waist circumference: for women, increased health risk begins above 80cm (31.5 inches), and high risk above 88cm (34.5 inches). Your GP can assess your overall health picture, including blood pressure, cholesterol, blood sugar, and lifestyle factors—not just BMI alone.
- 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 a healthy BMI for women according to the NHS?
A healthy BMI for most UK women is between 18.5 and 24.9. For women of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends a healthy BMI range of 18.5 to 22.9 due to higher health risks at higher BMI levels in these groups.
How do I calculate my BMI using the NHS BMI formula?
Divide your weight in kilograms by your height in metres squared. For example, if you weigh 65kg and are 1.65m tall: 65 ÷ (1.65 × 1.65) = BMI of 23.9. Our free BMI calculator above does this instantly for you.
Why are BMI thresholds different for some ethnicities?
Research shows that women of South Asian, Chinese, Black African, and Black Caribbean backgrounds have a higher risk of type 2 diabetes and heart disease at lower BMI levels compared to other groups. The NHS adjusted thresholds reflect this evidence to ensure fairer health assessment across all communities.
Is a high BMI always a sign of poor health?
Not necessarily. BMI does not account for muscle mass, bone density, or where fat is stored. Athletes may have high BMI but excellent health. Waist circumference, blood pressure, cholesterol, and fitness level are also important. Your GP can provide personalised health assessment beyond BMI alone.
What should I do if my BMI falls in the overweight or obese range?
Discuss your results with your GP, who can assess your overall health and discuss safe, evidence-based approaches to weight management if appropriate. The NHS recommends aiming to lose 0.5–1kg per week through a balanced diet and regular physical activity. Your GP can refer you to specialist support services if needed.
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.