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 Table for Women Using Kilograms
A BMI table for women using kilograms helps you quickly understand where your weight falls within NHS health categories. BMI (Body Mass Index) is calculated by dividing your weight in kilograms by the square of your height in metres. For UK women, the NHS provides clear BMI ranges that indicate whether you're at a healthy weight, overweight, or obese. This guide shows you the standard BMI formula, NHS categories, and explains what each range means for your health — plus important limitations to keep in mind.
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
The NHS BMI formula divides your weight (kg) by your height (m) squared. The results fall into five main categories that guide health recommendations:
- Below 18.5: Underweight — may indicate nutritional concerns
- 18.5 to 24.9: Healthy weight — the target range for most UK adults
- 25.0 to 29.9: Overweight — increased health risk for some conditions
- 30.0 to 34.9: Obese (Class I) — higher cardiovascular and metabolic risk
- 35.0 to 39.9: Obese (Class II) — significantly elevated health risks
- 40.0+: Severely obese (Class III) — severe health risks requiring medical support
For women of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower BMI thresholds: overweight starts at BMI 23.0 and obese at 27.5, because these populations face higher cardiovascular and metabolic risks at lower BMI levels. Use our free BMI calculator above to determine your personal BMI instantly.
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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 Support and When to Seek Help
The NHS offers a structured weight management pathway for women who need support. Tier 1 includes self-help resources and community programmes; Tier 2 involves GP-led behaviour change support; Tier 3 provides specialist multidisciplinary weight management services where prescription medications like GLP-1 injections may be considered; and Tier 4 covers bariatric surgery for severe obesity. Your GP can assess your individual circumstances, discuss your healthy weight range, and refer you to appropriate support if needed. Even a 5–10% reduction in body weight can improve blood pressure, blood sugar control, and reduce joint pain. Track your progress using our free progress tracker to monitor meaningful changes over time.
- 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 UK women?
The NHS defines healthy BMI for most UK women as 18.5 to 24.9. However, women of South Asian, Chinese, Black African, or Black Caribbean descent should aim for 18.5 to 22.9, as these groups face higher health risks at higher BMI levels. Your GP can discuss what's healthy for your individual circumstances.
How do I calculate my BMI using kilograms?
Divide your weight in kg by your height in metres squared. Example: if you weigh 70kg and are 1.65m tall, your BMI is 70 ÷ (1.65 × 1.65) = 25.7. Our BMI calculator above does this instantly for you.
Why do South Asian and Black women have lower BMI thresholds?
Research shows these populations develop type 2 diabetes and cardiovascular disease at lower BMI levels than other groups. The NHS therefore recommends lower threshold points to identify health risks earlier and enable earlier intervention.
What should I do if my BMI is in the obese range?
Schedule an appointment with your GP, who can assess your overall health, discuss contributing factors, and recommend appropriate support. This might include lifestyle changes, behaviour change programmes, or referral to specialist weight management services. Treatment is personalised to your circumstances.
Is BMI accurate for all women?
BMI has limitations — it doesn't distinguish between muscle and fat, doesn't account for where fat is stored, and may be less accurate for very muscular women, elderly women, or pregnant women. Your GP can provide holistic health assessment beyond BMI alone, considering waist circumference, fitness, and other factors.
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.