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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BMI Chart for Women in kg — NHS Categories & Healthy Weight Ranges
A BMI chart for women in kg helps you understand where your weight falls within NHS health categories. Using the standard BMI formula, you can find your personal BMI and see how it compares to NHS recommendations for healthy weight, overweight, and obese ranges. Our free BMI calculator on this page lets you check your BMI instantly, but understanding the chart itself — and what the NHS says about each range — is equally important for making informed health decisions.
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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 for Women
The NHS BMI chart for women uses the same categories as for men, based on your weight in kg and height. Your BMI is calculated using the formula: weight (kg) ÷ height (metres)². The NHS recognises these standard BMI ranges:
- Underweight: BMI below 18.5
- Healthy weight: BMI 18.5 to 24.9
- Overweight: BMI 25.0 to 29.9
- Obese (Class I): BMI 30.0 to 34.9
- Obese (Class II): BMI 35.0 to 39.9
- Severely obese (Class III): BMI 40.0 and above
For women of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower BMI thresholds due to increased health risk at lower weights. For these groups, a healthy BMI starts at 18.5 but drops to 22.9 as the upper healthy range, with overweight starting at 23.0. This reflects evidence showing these populations face higher risks of type 2 diabetes and heart disease at lower BMI levels. Use our free BMI calculator above to find your personal BMI and see which category applies to you.
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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 Weight Management Pathway and When to Seek Help
If your BMI chart shows you fall outside the healthy range, the NHS recommends speaking to your GP. Your doctor can assess your individual health, discuss any weight-related health conditions you may have, and explain the NHS weight management pathway. This typically starts with tier 1 support — self-help tools and lifestyle advice. For some people, tier 2 or tier 3 services (specialist weight management programmes) may be recommended, which can include behaviour change support, dietary guidance, and in some cases, prescription medications following a clinical assessment. Remember that BMI is a screening tool only — it doesn't account for muscle mass, bone density, or where fat is stored. Your waist measurement and overall health picture matter too. A GP can give you personalised advice about what your BMI means for your individual health.
- 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?
The NHS defines a healthy BMI for most women as 18.5 to 24.9. However, for women of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends a healthy range of 18.5 to 22.9 due to higher health risks at lower BMI levels in these populations. Use our BMI calculator to find your personal healthy weight range based on your height.
How do I calculate my BMI from a chart in kg?
The BMI formula is: weight (kg) ÷ height (metres)². For example, if you weigh 65kg and are 1.65m tall, your BMI is 65 ÷ (1.65)² = 23.9, which falls in the healthy weight range. Our free BMI calculator on this page does this instantly — simply enter your weight in kg and height, and it shows your BMI and category.
At what BMI should I talk to my GP about my weight?
If your BMI is consistently above 25.0 (overweight) or if you have a BMI of 23.0 or above with weight-related health conditions like type 2 diabetes or high blood pressure, it's worth discussing with your GP. They can assess your individual circumstances and discuss support options available through the NHS.
Why are BMI thresholds lower for some ethnic groups?
Research shows that South Asian, Chinese, Black African, and Black Caribbean populations develop weight-related health problems like type 2 diabetes and heart disease at lower BMI levels than other groups. The NHS therefore recommends lower BMI thresholds (healthy range 18.5–22.9 instead of 18.5–24.9) to identify health risks earlier in these communities.
What should I do if my BMI falls in the obese category?
If your BMI is 30.0 or above, speak to your GP. You may be eligible for NHS weight management support, which could include tier 2 or tier 3 services, behaviour change programmes, and in some cases, prescription weight loss medications following a clinical assessment. Your GP will discuss options tailored to your health.
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.