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's a Normal Body Weight for a 5ft 3in Female?
For a 5ft 3in (160cm) female, a healthy weight typically falls between 50–67 kg (7st 12lbs–10st 8lbs) according to NHS BMI guidance. However, your ideal weight depends on several factors including muscle mass, bone density, and overall health. This guide explains the UK health approach to healthy weight, how to use our free BMI calculator to find your personal healthy weight range, and why individual circumstances matter more than a single number.
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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.
UK Healthy Weight Ranges and BMI Guidelines
The NHS defines a healthy BMI range as 18.5 to 24.9 for most UK adults. For a 5ft 3in female, this translates to a healthy weight of approximately 50–67 kg (7st 12lbs–10st 8lbs).
However, this is a general guide. Your healthy weight also depends on:
- Ethnicity: Women of South Asian, Chinese, Black African, or Black Caribbean heritage have different health risk thresholds — the NHS recommends aiming for a BMI of 18.5–22.9 for these groups
- Muscle mass: Athletic or muscular women may have a higher healthy weight due to muscle being denser than fat
- Overall health: Weight-related health conditions like type 2 diabetes or high blood pressure may influence your personal target
- Age and life stage: Metabolism changes with age, and pregnancy, menopause, and medication can all affect weight
Use our free BMI calculator above to find your personal BMI and healthy weight range based on your exact height and current weight.
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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 Health Guidance and Personal Health Context
Weight is just one aspect of health. The NHS emphasises that sustainable weight management combines balanced nutrition, regular physical activity, and adequate sleep. If you're concerned about your weight or have weight-related health conditions, your GP can provide personalised advice tailored to your individual circumstances.
For practical health management, consider using our free weight converter tool to track your progress in measurements you find most helpful (stone, kilograms, or pounds). Many women find it useful to also measure waist circumference — the NHS recommends under 80cm (31.5in) for women to reduce health risks — rather than relying on weight alone.
If you're exploring weight management options, our GLP-1 weight loss calculator can help you understand potential outcomes with structured weight loss 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.
What's the exact healthy weight range for a 5ft 3in female in the UK?
According to NHS BMI guidelines, the healthy weight range for a 5ft 3in (160cm) female is approximately 50–67 kg (7st 12lbs–10st 8lbs). This assumes a BMI of 18.5–24.9. However, your personal ideal weight depends on factors like muscle mass, ethnicity, age, and overall health. Your GP can advise on your individual target.
Does ethnicity affect healthy weight for women at this height?
Yes. The NHS recommends lower BMI thresholds for women of South Asian, Chinese, Black African, or Black Caribbean heritage due to higher health risks at lower weights. For these groups, a healthy BMI range is 18.5–22.9, which would mean a healthy weight of approximately 50–59 kg (7st 12lbs–9st 4lbs) at 5ft 3in.
Is BMI the only measure of healthy weight?
No. BMI is a useful screening tool but doesn't account for muscle mass, bone density, or where fat is stored. The NHS also recommends measuring waist circumference (under 80cm for women) and considering overall health, fitness, and weight-related health conditions. Your GP can provide a fuller health picture.
How can I find my healthy weight range easily?
Use our free BMI calculator on this page — simply enter your height and weight, and it will show your BMI category and healthy weight range based on NHS guidance. You can also use our weight converter tool to switch between stone, kg, and pounds as you track progress.
What should I do if I'm concerned about my weight?
Start by discussing your concerns with your GP, who can assess your individual health, check for weight-related conditions, and advise on whether weight loss is appropriate for you. They can signpost you to NHS weight management support in your area, which may include behaviour change programmes or specialist services.
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.