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 Is 57 Kilograms in Stones and Pounds?
57 kilograms is equal to 8 stone and 12.8 pounds (often rounded to 8 stone 13 pounds). However, whether this is a healthy weight depends entirely on your height. Using the standard kg to stone conversion, we can calculate your BMI at different heights to see where you fall on the NHS BMI scale. Use our free BMI calculator above to find your exact BMI, or read on to see typical examples for this weight across common UK heights.
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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.
57kg BMI at Different Heights
57 kilograms gives different BMI values depending on how tall you are. Here are examples of what 57kg means on the NHS BMI scale at various heights:
- At 5ft 2in (157cm): BMI of 21.6 — healthy weight
- At 5ft 4in (163cm): BMI of 19.1 — healthy weight
- At 5ft 6in (168cm): BMI of 17.4 — healthy weight (lower end)
- At 5ft 8in (173cm): BMI of 15.9 — underweight
- At 5ft 10in (178cm): BMI of 14.8 — underweight
The kilogram to stone conversion remains constant, but your BMI category shifts as height increases. Use our weight converter and BMI calculator to find your exact figure.
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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.
Understanding BMI Categories
The NHS uses these BMI ranges for UK adults: healthy weight is 18.5 to 24.9, overweight is 25.0 to 29.9, and obese is 30.0 and above. For people of South Asian, Chinese, Black African, or Black Caribbean heritage, lower thresholds apply — healthy weight starts at 18.5 but overweight begins at 23.0. BMI is a useful screening tool but has limitations: it does not distinguish between muscle and fat, and does not account for where fat is stored. Your GP can provide personalised advice about what your BMI means for your individual health and 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.
How do I convert 57 kilos to stones and pounds?
Divide 57 by 6.35029 to get 8.98 stone, which equals 8 stone and 12.8 pounds. Our free weight converter makes this instant. The metric to imperial weight conversion is straightforward — 57kg is roughly 8st 13lbs in UK measurements.
Is 57kg a healthy weight?
It depends on your height. At average UK heights (5ft 4in to 5ft 6in), 57kg typically gives a healthy BMI. At taller heights, it may be underweight. Use our BMI calculator above to find your personal BMI and NHS category based on your exact height.
What does my BMI tell me about my weight?
BMI gives a quick health screening indicator, but it is not the complete picture. It does not show body composition, muscle mass, or where fat is stored. Waist measurement also matters — the NHS recommends discussing your weight and health with your GP for personalised guidance.
Is 57kg different for men and women?
BMI is calculated the same way for all adults regardless of sex. However, healthy body fat percentage ranges differ between men and women. At 57kg, both would need to consider their height to assess whether it falls in a healthy BMI range for their individual circumstances.
How can I track my weight progress?
Use our free progress tracker to log your weight over time and see trends. Combined with regular BMI checks using our calculator, you can monitor whether your weight is moving toward or away from a healthy range for your height and circumstances.
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.