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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What's the ideal weight for a 5'5 female?
For a woman who is 5 feet 5 inches (165 cm) tall, the ideal weight range according to NHS guidelines is approximately 50–67 kg (7 stone 12 lbs to 10 stone 7 lbs). This range is based on a healthy BMI of 18.5 to 24.9, which represents the weight bracket associated with the lowest health risks for most adults. However, "ideal" weight is individual and depends on factors like muscle mass, bone density, and overall fitness. Our free BMI calculator helps you discover where your personal weight falls within the healthy range for your height.
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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.
BMI-based healthy weight range for 5'5 females
The ideal body weight for a 5'5" woman is calculated using the NHS BMI framework. A healthy BMI sits between 18.5 and 24.9, and for your height, this translates to a weight range of 50–67 kg or 7 stone 12 lbs to 10 stone 7 lbs.
To calculate this range: BMI = weight (kg) ÷ height (m)². At 165 cm (1.65 m), the lower bound is 18.5 × (1.65)² = 50.3 kg, and the upper bound is 24.9 × (1.65)² = 67.7 kg.
This healthy weight range is evidence-based and widely recognised by the NHS as associated with lower risks of type 2 diabetes, heart disease, and certain cancers. However, this range is a guide, not a target—your actual ideal weight may fall anywhere within it depending on your muscle mass, frame size, and individual health profile.
Use our free BMI calculator above to check exactly where your current weight sits and discover your personal healthy weight range 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.
How to find your healthy weight using the BMI calculator
The most practical way to determine what should i weigh is to use a healthy weight calculator based on your height and current weight. Enter your details into our free BMI calculator on this page to see your BMI instantly and understand whether you fall within the healthy range.
If your current weight is outside the healthy bracket, our calculator also shows you the weight range you'd need to reach to achieve a healthy BMI. Many people find it helpful to use the weight converter on this page to switch between kg and stone—UK measurements that make it easier to track progress over time.
Remember: the nhs healthy weight framework is a starting point. Your GP can provide personalised advice about what weight is right for your individual circumstances, especially if you have specific health conditions or fitness goals.
- 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 there an average UK weight for women aged 25–35?
According to recent data, the average UK adult woman weighs approximately 71.6 kg (11 stone 3 lbs). However, "average" does not mean "ideal"—many women at the average weight may still be overweight by BMI standards. At 5'5", a weight of 71.6 kg gives a BMI of about 26.5, which falls in the overweight category. Use our BMI calculator to find your personal healthy range.
Does muscle mass change what the ideal weight should be?
Yes, significantly. BMI does not distinguish between muscle and fat—athletes and very fit individuals may have a high BMI but low body fat. If you're very muscular, your ideal weight may sit higher than the standard BMI range. Conversely, if you have low muscle mass, you may be healthier at a weight lower than the average range. Discuss your individual circumstances with your GP.
What is the weight for height UK guidance for overweight vs. obese?
At 5'5", the NHS categories are: healthy weight (50–67 kg), overweight (67–80 kg), obese class I (80–95 kg), and obese class II (95+ kg). These are based on BMI thresholds of 18.5–24.9 (healthy), 25–29.9 (overweight), 30–34.9 (obese I), and 35+ (obese II). Our weight converter and BMI calculator make it easy to check which category you fall into.
If I'm 5'5" and my BMI is 25, am I overweight?
Yes, a BMI of 25 falls just into the overweight category (BMI 25–29.9 according to NHS guidelines). At 5'5", this equates to approximately 68 kg (10 stone 10 lbs). You're just above the healthy weight range. Small changes in diet and activity often help bring BMI back into the healthy bracket—try our progress tracker to log small steps toward your goal.
Is the healthy weight range different for women of South Asian or Black African heritage?
Yes. The NHS recommends lower BMI thresholds for people of South Asian, Chinese, Black African, and Black Caribbean heritage due to higher health risks at lower BMI levels. For these groups, healthy BMI is 18.5–22.9 rather than 18.5–24.9. At 5'5", this means an ideal weight range of 50–61 kg (7 stone 12 lbs to 9 stone 9 lbs). Ask your GP if lower thresholds apply to you.
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.