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 57kg in Stone?
57kg converts to 8 stone 12.8 pounds (or 8st 12.8lbs in UK notation). To convert kilograms to stone, divide the kilogram value by 6.35029. At this weight, your BMI depends on your height — use our free BMI calculator above to find your personal BMI instantly. Understanding your weight in both metric and imperial measurements is useful for UK health contexts, whether you're tracking progress or discussing your weight with your GP. This guide shows you the conversion, nearby weight values, and healthy weight context at this specific weight.
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.
57kg to Stone Conversion Table
57kg equals 8 stone and 12.8 pounds. The kilogram to stone conversion uses a simple formula: divide kilograms by 6.35029 to get stone. Here are conversions for weights near 57kg so you can see the pattern:
- 52kg = 8st 3.2lbs
- 54kg = 8st 7.2lbs
- 56kg = 8st 11.2lbs
- 57kg = 8st 12.8lbs
- 58kg = 9st 1.6lbs
- 59kg = 9st 3.2lbs
- 62kg = 9st 10lbs
To convert stone and pounds back to kilograms, multiply stone by 6.35029 and add (pounds × 0.453592). This metric to imperial weight conversion works the same way whether you're tracking health progress or checking clothing sizes.
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.
BMI and Healthy Weight at 57kg
At 57kg, your BMI depends entirely on your height. For example, at an average UK female height of 163cm (5ft 4in), a weight of 57kg gives a BMI of 21.4 — which falls in the healthy weight range according to NHS guidelines (18.5–24.9). At an average UK male height of 175cm (5ft 9in), 57kg would give a BMI of 18.6 — also healthy. Calculate your personal BMI now using our free BMI calculator on this page to see where you fall. Remember, BMI is a useful screening tool but doesn't account for muscle mass or where fat is stored. Your GP can provide personalised health advice based on your individual 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.
What is 57kg in stone and pounds exactly?
57kg converts to 8 stone 12.8 pounds (8st 12.8lbs). To calculate this, divide 57 by 6.35029 (the kg-to-stone conversion factor), which gives 8.97 stone. Multiply the decimal (0.97) by 14 to get pounds: 13.58 lbs, which rounds to 12.8lbs for practical purposes.
Is 57kg a healthy weight?
Whether 57kg is healthy depends on your height and age. Use our free BMI calculator to find your personal BMI — at average UK heights, 57kg typically falls in the healthy weight range. However, BMI is just one health measure. Your GP can assess your overall health considering factors like fitness, medical history, and where weight is distributed.
How do I convert 57kg to pounds?
Multiply 57 by 2.20462 (the kg-to-lbs conversion factor) to get 125.66 pounds. For stone and pounds, divide 57 by 6.35029 to get 8.97 stone, which equals 8 stone and 12.8 pounds. Use our weight converter above for instant conversions between all units.
How much weight would I need to lose or gain to reach a specific BMI?
This depends on your height. Use our free BMI calculator above to find your current BMI, then our GLP-1 weight loss calculator can show you projected weight changes. For personalised guidance, speak to your GP or a registered dietitian who can assess your individual health needs and goals.
Why do UK measurements use stone when most of the world uses kilograms?
The UK traditionally uses imperial measurements, and stone remains common in UK culture, clothing sizes, and everyday conversation. However, the NHS uses kilograms for clinical measurements. Having both conversions available — like our weight converter — helps you communicate your weight accurately in any context.
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.