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 a Woman Weigh at 5'3"?
At 5'3" (160cm), a healthy weight for most women falls between approximately 47–63 kg (7 stone 5 lbs to 9 stone 13 lbs) 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. Our free BMI calculator above can help you find your personal healthy weight range and understand what your weight 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 Results Mean
Using our BMI calculator, you can instantly discover your current BMI and see where it falls on the NHS health scale. A healthy BMI is between 18.5 and 24.9 — this is the range associated with lower health risks for most UK adults. At 5'3", a BMI of 18.5 corresponds to roughly 47 kg (7 stone 5 lbs), while a BMI of 24.9 is around 63 kg (9 stone 13 lbs).
If you're of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends slightly lower thresholds — a healthy weight range would be 18.5 to 22.9 BMI, roughly 47–57 kg at your height. This is because these populations face higher health risks from conditions like type 2 diabetes at lower BMI levels.
Remember: BMI is a useful screening tool but has limitations. It doesn't distinguish between muscle and fat, so athletes or very muscular individuals may have a higher BMI without increased health risk. Your GP can discuss what a healthy weight means specifically for you.
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.
If You're Above a Healthy Weight Range
If the BMI calculator shows you're above the healthy weight range, small changes can make a real difference. Even losing 5–10% of your body weight can improve blood pressure, blood sugar control, and joint health — you don't need to reach a "perfect" number.
Starting points: use our weight converter to track your current weight in kg, stone, and lbs so you can monitor progress clearly. Sustainable loss is typically 0.5–1 kg per week through a combination of modest calorie reduction and increased physical activity. Your GP can suggest local weight management support, or you can explore NHS digital tools and community programmes. If you have weight-related health conditions, your GP may discuss prescription options.
- 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 5'3" considered short for a woman in the UK?
At 160cm (5'3"), you're slightly below the UK average female height of approximately 161.6cm. Height varies widely and is influenced by genetics. What matters most for health is where your weight sits relative to your height — your BMI — rather than height itself. Use our BMI calculator to check your personal health metrics.
What's the difference between ideal weight and healthy weight?
Ideal weight is often calculated using formulas like the Devine or Robinson method, but these give rough estimates. Healthy weight is defined by your BMI falling in the 18.5–24.9 range (or lower thresholds for certain ethnicities). Your healthy weight range is typically 5–10 kg wide — there's no single "perfect" number. Your GP can advise on what's realistic for your individual circumstances.
Can I use a standard BMI chart or should I use a calculator?
Both work, but our free BMI calculator is faster and more accurate for your specific height. Standard BMI charts show ranges but your personal calculation gives an exact result. This is especially useful if you're between standard height categories on a chart.
Does muscle weight count differently than fat weight?
No — BMI counts total weight, not composition. If you're very muscular, BMI may overestimate health risk. Conversely, if you carry more fat and less muscle, BMI may underestimate risk. This is why BMI is a screening tool, not a complete picture. Your GP may suggest waist measurement or other assessments alongside BMI.
How often should I check my weight and BMI?
Weekly weighting is reasonable if you're tracking progress, though weight fluctuates naturally day-to-day due to water, food, and hormones. Monthly or quarterly BMI checks are often more meaningful for long-term trends. Use our progress tracker to log changes over time and spot patterns rather than obsessing over daily variation.
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.