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
How Much Should I Weigh at 5'3" as a Female?
At 5'3" (160cm), a healthy weight for an adult female typically falls between 47kg and 63kg (7 stone 6lbs to 9 stone 13lbs), based on NHS BMI guidelines. However, your ideal weight depends on your individual body composition, muscle mass, and overall health — not just a single number. Use our free BMI calculator above to find your personal healthy weight range and interpret what your BMI means for your health.
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.
What Your BMI Calculator Result Means
The BMI (Body Mass Index) is a useful screening tool that relates your weight to your height. For an adult female at 5'3", the NHS healthy weight range corresponds to a BMI between 18.5 and 24.9. This means:
- BMI below 18.5: Underweight — may indicate insufficient body mass for optimal health
- BMI 18.5–24.9: Healthy weight — associated with lower risk of weight-related health conditions
- BMI 25.0–29.9: Overweight — increased risk of type 2 diabetes and cardiovascular disease
- BMI 30+: Obese — significantly elevated health risks
Important: BMI doesn't distinguish between muscle and fat. Athletes or very muscular individuals may have a higher BMI within a healthy range. If you're unsure how to interpret your result, your GP can give you personalised guidance based on your complete health picture.
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
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.
What to Do if You're Above Your Healthy Weight Range
If your BMI calculator result shows you're above the healthy weight range, here are practical, evidence-based steps:
- Start with your GP: A consultation can identify any underlying health conditions and discuss safe weight management options
- Aim for gradual loss: The NHS recommends losing 0.5–1kg per week through a combination of reduced-calorie diet and increased physical activity — sustainable approaches work best
- Track progress: Use our free progress tracker to log your weight loss journey and stay motivated
- Explore support: Weight loss medications, digital programmes, or community weight management services are available depending on your BMI and health needs
Remember, even a 5% reduction in body weight can bring meaningful health benefits including improved blood pressure, better blood sugar control, and reduced joint strain.
- 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 exact healthy weight range for a 5'3" female in UK measurements?
At 5'3" (160cm), the NHS healthy weight range is approximately 47–63kg, or 7 stone 6lbs to 9 stone 13lbs. This corresponds to a BMI of 18.5–24.9. However, your ideal weight within this range depends on your individual frame size, muscle mass, and genetics. Use our BMI calculator to find your personal target.
Is BMI accurate for all women?
BMI is a useful screening tool but has limitations. It doesn't account for muscle mass (so athletes may have a higher BMI), bone density, or where fat is stored. For women of South Asian, Black African, or Black Caribbean heritage, the NHS recommends lower BMI thresholds due to higher health risks at the same BMI. Your GP can provide more detailed health assessment.
How quickly can I expect to lose weight safely?
The NHS recommends losing 0.5–1kg (1–2lbs) per week for sustainable, healthy weight loss. A calorie deficit of around 500kcal per day typically achieves this. Faster weight loss is possible with medical support but increases the risk of muscle loss and nutritional deficiencies.
What should I do if my BMI is above the healthy range?
Start by booking an appointment with your GP, who can assess your overall health and discuss weight management options. These may include dietary advice, exercise guidance, digital weight loss programmes, or — if appropriate — prescription weight loss medication alongside lifestyle changes.
Can I use a weight converter to check my weight in different units?
Yes. Our free weight converter helps you switch between kg, stone, and pounds easily. This is useful if you weigh yourself on a metric scale but prefer to track your weight in stone and pounds, as many UK adults do.
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.