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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Women's BMI Chart: Understanding Your Healthy Weight Range
A BMI chart for women shows where your weight falls across the NHS health categories — from underweight through to severely obese. Understanding your BMI range is a useful first step in assessing your health, though it's important to know that BMI is a screening tool only and doesn't account for muscle, bone density, or where fat is stored. This guide explains the standard BMI formula, UK thresholds for women, and how to interpret your personal BMI in context.
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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.
NHS BMI Categories and Healthy Weight Ranges for Women
The NHS BMI formula is the same for women and men: weight (kg) ÷ height (m)². For women, the NHS BMI categories are:
- Below 18.5: Underweight
- 18.5 to 24.9: Healthy weight
- 25.0 to 29.9: Overweight
- 30.0 to 34.9: Obese (Class I)
- 35.0 to 39.9: Obese (Class II)
- 40.0 and above: Severely obese (Class III)
For example, a woman who is 5ft 6in (168cm) tall falls into the healthy weight range between roughly 50kg and 67kg (7st 12lbs to 10st 7lbs). Our free BMI calculator above will instantly calculate your personal BMI from your height and weight — no need to do the maths yourself. Individual healthy BMI ranges vary by height, so checking your specific range is always more useful than general guidance.
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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 Why Waist Measurement Matters
BMI is a useful screening tool but has important BMI limitations: it doesn't distinguish between muscle and fat, so athletic women may have a high BMI despite low body fat percentage. It also doesn't account for where fat is stored — waist circumference is equally important for health risk assessment. The NHS recommends that women also measure their waist: over 80cm (31.5in) indicates increased health risk, and over 88cm (34.5in) indicates high risk. If you have concerns about your weight or health, your GP can discuss your personal situation and help you set realistic health goals beyond just a BMI 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.
What is the healthy BMI range for women?
The NHS defines a healthy BMI for women as 18.5 to 24.9. Your specific healthy weight range in kg or stone depends on your height — use our BMI calculator above to find your personal range instantly.
Is BMI accurate for all women?
BMI is a useful screening tool but has limitations. It doesn't account for muscle mass, bone density, or body composition. Women with high muscle mass may have a higher BMI but lower body fat. Waist measurement is an important complementary measure.
What does it mean if my BMI is over 30?
A BMI of 30 or above falls into the obese category according to NHS guidelines, which indicates increased risk of weight-related health conditions like type 2 diabetes and heart disease. Your GP can discuss your individual health picture and recommend next steps.
Does age affect healthy BMI for women?
The NHS BMI categories are the same across all adult ages. However, as women age, muscle naturally decreases, so maintaining physical activity becomes more important for health — not just achieving a BMI number.
Where can I find my healthy weight range?
Use the free BMI calculator on this page by entering your height and weight. It will show you your BMI category and your healthy weight range for your height according to NHS guidelines. ```
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.