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
Is 57 Kilos a Healthy Weight?
57 kilos converts to 8 stone and 12 pounds (or 125.7 lbs). Whether this weight is healthy depends entirely on your height, age, and individual health factors. For some adults, 57kg is well within a healthy range; for others, it may fall outside. The most reliable way to assess whether your weight is healthy is to calculate your BMI and compare it against NHS guidelines. Our free BMI calculator above will instantly show you where your weight sits and whether it's in a healthy range for your height.
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.
Healthy Weight Ranges by Height at 57kg
At 57 kilos, your weight status depends on how tall you are. Here are three practical examples using NHS healthy weight guidance:
- At 5ft 0in (152cm): 57kg gives a BMI of 24.7 — within the healthy range (18.5–24.9). This weight would be considered healthy.
- At 5ft 4in (163cm): 57kg gives a BMI of 21.4 — comfortably healthy. This is a good weight for this height.
- At 5ft 8in (173cm): 57kg gives a BMI of 19.0 — healthy. At this height, 57kg is in the lower half of the healthy range.
If you're shorter than 5ft 0in, 57kg may be above your healthy weight range. If you're taller than 5ft 8in, 57kg may be below the healthy range. Use our weight converter and BMI calculator to check your personal healthy weight range based on your exact height.
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.
NHS Guidance: Is Your Weight Right for You?
BMI is the primary NHS tool for assessing healthy weight. A healthy BMI sits between 18.5 and 24.9 for most UK adults. However, BMI alone doesn't tell the whole story — waist measurement also matters. The NHS recommends that men keep their waist below 94cm (37 inches) and women below 80cm (31.5 inches) for good health. If 57kg puts you outside a healthy BMI range for your height, or if you're concerned about your weight and health, speak to your GP. They can assess your individual situation, consider your medical history, and advise whether any action is needed. Remember: weight is just one health marker. Regular physical activity, good nutrition, and stress management matter equally.
- 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 57kg in stones and pounds?
57kg equals 8 stone and 12 pounds (8st 12lbs), or 125.7 lbs in pure pounds. Use our free weight converter above to convert between kilos, stone, and lbs instantly for any weight.
Is 57kg a healthy weight?
It depends on your height. At 5ft 4in, 57kg is healthy (BMI 21.4). At 5ft 0in, it's healthy (BMI 24.7). At 5ft 8in, it's healthy (BMI 19.0). Shorter heights may be overweight; taller heights may be underweight. Calculate your personal BMI using the calculator on this page.
What's my healthy weight range at 57kg?
If you're 57kg, your healthy range depends on your height. The NHS healthy BMI range is 18.5–24.9. At 5ft 6in, the healthy weight range is roughly 47–64kg. At 5ft 10in, it's roughly 52–70kg. Check with our BMI calculator for your exact height.
Should I lose weight if I'm 57kg?
Only if your BMI is above 25 and your GP advises it. Many people at 57kg are in a healthy weight range. Speak to your GP if you're unsure — they can assess your individual health, not just the number on the scales.
How do I track weight changes from 57kg?
Use our free progress tracker to log your weight over time and see trends. Combine this with regular activity and healthy eating. Weight loss should be gradual — the NHS recommends 0.5–1kg per week for sustainable results. Your GP can advise on safe targets for 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.