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 Female BMI of 26 Mean?
A BMI of 26 puts you in the overweight category according to NHS guidelines. This means your weight is above the healthy range for your height, though it's still below obesity thresholds. The good news is that even modest weight loss — as little as 5–10% of your current body weight — can bring meaningful health improvements. Understanding where you sit on the BMI scale is the first step towards making informed decisions about your health. Use our free BMI calculator above to see your exact BMI and healthy weight range for your specific height.
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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.
BMI 26 and NHS Categories Explained
According to NHS guidelines, a BMI of 26 falls in the overweight category, which covers BMI 25.0 to 29.9. Below 18.5 is underweight, 18.5–24.9 is healthy weight, and 30 and above is obese. The NHS BMI formula divides your weight in kilograms by your height in metres squared — this same calculation applies to all adults.
For women of South Asian, Chinese, Black African, or Black Caribbean heritage, slightly different thresholds apply. The NHS recommends these groups aim for a healthy BMI range of 18.5–22.9, as research shows they face higher health risks at higher BMI levels. At a BMI of 26, women from these backgrounds would be in the overweight category with recommendations to consider lifestyle changes.
- Healthy BMI for most UK women: 18.5–24.9
- Healthy BMI for South Asian and other specified groups: 18.5–22.9
- Your personal healthy weight range depends on your exact height
Try our free BMI calculator to find your exact healthy weight range in stone and pounds.
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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.
Why BMI Has Limits and What Else Matters
BMI doesn't tell the whole story about health. It doesn't distinguish between muscle and fat — athletes or very muscular individuals may have a high BMI but low body fat. BMI also doesn't account for where fat is stored, and waist circumference is increasingly recognised as important. A measurement around your natural waist is worth tracking alongside BMI: for women, over 80cm (31.5 inches) indicates increased health risk, and over 88cm (34.5 inches) indicates high risk.
Other useful health markers include blood pressure, cholesterol levels, and how you feel physically. Your GP can assess your individual health picture beyond just BMI. If you're concerned about your weight and health, a conversation with your GP is the best first step — they can discuss your personal health risks and appropriate next steps, whether that's lifestyle changes, increased activity, or other support.
- 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 26 overweight for a woman?
Yes, according to NHS guidelines. A BMI of 26 falls in the overweight category (25.0–29.9). The healthy range for most UK women is 18.5–24.9. However, BMI is just one health indicator — your GP can assess your overall health picture based on your individual circumstances, medical history, and other factors.
What should a woman weigh for a healthy BMI?
Healthy weight depends on your height. For example, a woman 5ft 5in (165cm) tall would have a healthy weight range of approximately 48–65kg (7st 8lbs to 10st 3lbs). Use our free BMI calculator above to find your personal healthy weight range in stone and pounds based on your exact height.
Can I lower a BMI of 26 without medication?
Yes. Losing 5–10% of your body weight through a balanced diet and increased physical activity can bring health benefits and lower your BMI. The NHS recommends aiming for gradual weight loss of 0.5–1kg per week for sustainable results. Your GP or a registered dietitian can provide personalised advice on diet and exercise approaches that suit you.
Does a BMI of 26 mean I have a weight-related health condition?
Not automatically. A BMI of 26 alone doesn't diagnose any condition. However, being overweight increases the risk of type 2 diabetes, high blood pressure, and heart disease over time. Your GP can check your blood pressure, blood sugar, and cholesterol to assess your individual health risk.
What's the difference between overweight and obese BMI?
Overweight (BMI 25.0–29.9) is below the obesity threshold. Obese starts at BMI 30.0. At BMI 26, you're in the overweight category. The NHS and your GP can discuss appropriate next steps based on your health, family history, and any weight-related symptoms you may have.
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.