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 Is the Ideal Weight for a 5'5 Female?
For a 5'5" (165 cm) adult female, the healthy weight range according to NHS guidelines is approximately 50 to 67 kg (7 stone 12 lbs to 10 stone 6 lbs). This range is based on a healthy BMI of 18.5 to 24.9. However, "ideal" weight varies between individuals depending on muscle mass, frame size, age, and ethnicity. Use our free BMI calculator above to find out where your personal weight sits on the healthy scale, or try our weight converter to switch between kg and stone measurements instantly.
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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.
Healthy Weight Range and NHS Guidelines
The healthy weight range for a 5'5" female is 50–67 kg (7st 12lbs–10st 6lbs), based on NHS BMI categories. This corresponds to a BMI between 18.5 and 24.9, which the NHS classifies as a healthy weight for adults of White British, Black African, and Caribbean heritage.
For adults of South Asian, Chinese, or other ethnic backgrounds, the NHS recommends slightly lower thresholds: a healthy BMI of 18.5 to 22.9, which translates to approximately 50–61 kg (7st 12lbs–9st 9lbs) for your height.
- Lower healthy weight boundary: 50 kg (7st 12lbs)
- Upper healthy weight boundary: 67 kg (10st 6lbs)
- Average UK adult female weight: approximately 71.6 kg (11st 3lbs)
- BMI at 50 kg: 18.5 (just entering healthy range)
- BMI at 67 kg: 24.9 (top of healthy range)
Weight within this range doesn't assures perfect health, but it's associated with lower risk of weight-related conditions including type 2 diabetes, cardiovascular disease, and certain cancers. Calculate your personal BMI now using our free calculator on this page to see exactly where you sit.
Clinically BackedWeight Loss
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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.
Factors That Affect Your Ideal Body Weight
Your ideal body weight isn't a single number—it's a range influenced by several factors. Muscle mass: muscle is denser than fat, so two people at the same weight can look completely different. Frame size: smaller frames naturally carry less weight; larger frames more. Age: metabolism slows with age, and muscle mass declines naturally, affecting your ideal weight calculator baseline.
Ethnicity: the NHS recognises that South Asian, Chinese, Black African, and Black Caribbean adults face higher health risks at lower BMI levels, so different thresholds apply. Hormonal factors: thyroid function, oestrogen levels, and menopause significantly impact weight distribution and ideal ranges. Rather than fixating on a single number, focus on how you feel, your energy levels, and your health markers—blood pressure, cholesterol, and blood sugar. Your GP can provide personalised guidance on what's healthy for your individual circumstances.
- 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 should a 5'5" female ideally weigh in stone?
For a 5'5" female, the healthy weight range is 7 stone 12 lbs to 10 stone 6 lbs (50–67 kg). This range is based on a healthy BMI of 18.5–24.9 according to NHS guidelines. Individual ideal weight varies by muscle mass, frame size, and age.
What's the average weight for a 5'5" female in the UK?
The average UK adult female weighs approximately 11 stone 3 lbs (71.6 kg). However, average and healthy are different—many UK women fall above the healthy weight range. Use the BMI calculator on this page to check your personal range.
How do I calculate my ideal weight range for my height?
Ideal weight range is calculated using BMI. For a healthy BMI of 18.5–24.9, multiply your height in metres squared by 18.5 and 24.9. For 5'5" (1.65m): 18.5 × (1.65)² = 50 kg (lower), 24.9 × (1.65)² = 67 kg (upper). Our free BMI calculator does this instantly.
Does ideal weight differ by ethnicity?
Yes. The NHS recommends lower BMI thresholds for South Asian, Chinese, Black African, and Black Caribbean adults due to higher health risks at lower weights. For these groups, a healthy BMI is 18.5–22.9, equating to approximately 50–61 kg for a 5'5" female.
What if I'm above the ideal weight range—how can I get started?
Even modest weight loss (5–10% of body weight) brings health benefits. Start with a reduced-calorie diet and increased physical activity. Track your progress with our free progress tracker, or consult your GP about personalised guidance. Prescription weight loss support is available through NHS specialist services or private healthcare.
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.