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
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57 Kg In Stones And Lbs — What's Your BMI?
57 kg converts to 8 stone and 12.8 pounds in UK measurements. However, your BMI at this weight depends entirely on your height. Someone who is 5ft 3in (160cm) will have a very different BMI than someone who is 6ft tall (183cm). Use our free BMI calculator above to find your exact BMI, then see where you fall within NHS health categories. This guide shows you what 57kg means for your health at different 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.
What BMI Does 57 Kg Give At Different Heights?
At 57 kg, your BMI varies significantly by height. Here are examples for common UK heights:
- 5ft 2in (157cm): BMI 23.1 — healthy weight range
- 5ft 4in (163cm): BMI 21.3 — healthy weight range
- 5ft 6in (168cm): BMI 19.8 — healthy weight range
- 5ft 8in (173cm): BMI 18.4 — underweight (just below healthy range)
- 5ft 10in (178cm): BMI 17.2 — underweight
- 6ft 0in (183cm): BMI 16.1 — underweight
To convert kilograms to stone, divide 57 by 6.35 to get 8.98 stone, which equals 8 stone and 12.8 pounds. For a personalised assessment of what this weight means for your health, calculate your exact BMI using the tool on this page.
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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 Your BMI At 57 Kg
According to NHS guidelines, a healthy BMI is between 18.5 and 24.9 for most UK adults. At 57 kg, whether you're in a healthy weight range depends on your height — as shown above, taller individuals may fall into the underweight category at this weight, whilst shorter adults are likely in the healthy range.
Important: BMI has limitations. It doesn't account for muscle mass, bone density, or where fat is stored. If you're athletic or very muscular, your BMI may appear higher than your actual body fat percentage. For South Asian, Chinese, Black African, or Black Caribbean adults, the NHS recommends lower BMI thresholds due to higher health risks at the same BMI. Always speak with your GP if you're concerned about your weight or health.
- 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 57 kg in stones and pounds?
57 kg equals 8 stone and 12.8 pounds. To convert kilograms to stone and pounds, divide the kg by 6.35029 to get stone, then multiply any remaining decimal by 14 to get additional pounds. Our free weight converter on this page makes this calculation instant.
Is 57 kg a healthy weight?
Whether 57 kg is healthy depends on your height, age, and body composition. At shorter heights (5ft 2–5ft 4in), it's typically in the healthy weight range. At taller heights (5ft 10in+), it may be underweight. Use our free BMI calculator above to check your personal BMI and see where you fall within NHS categories.
What are the NHS BMI categories?
The NHS defines healthy BMI as 18.5–24.9, overweight as 25.0–29.9, obese as 30.0–34.9, and severely obese as 40.0 and above. For people of South Asian, Chinese, Black African, or Black Caribbean heritage, lower thresholds apply (healthy weight 18.5–22.9, overweight 23.0–27.4, obese 27.5+).
Can I use BMI alone to assess my health?
No. BMI is a useful screening tool but has important limitations. It doesn't distinguish between muscle and fat, doesn't account for where fat is stored, and is less accurate for elderly people or athletes. Your GP can provide personalised health advice based on your full health picture, not just BMI.
How does height affect BMI at 57 kg?
BMI is calculated by dividing weight by height squared, so height has a huge impact. At 57 kg, a person who is 5ft 4in has a BMI of around 21.3 (healthy), whilst someone 6ft tall has a BMI of around 16.1 (underweight). This is why calculating your personal BMI based on your actual height is essential.
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.