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?
57 kilograms converts to exactly 8 stone and 12.8 pounds in UK measurements. This conversion uses the standard formula: divide kilograms by 6.35 to get stone. If you're tracking your weight in the UK health system, understanding how to convert between metric and imperial measurements is useful for comparing your weight against NHS guidance and calculating your personal BMI. Use our free weight converter above to switch between kg, stone, and pounds instantly.
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 in UK Health Context
At 57kg, your weight falls into a range relevant to UK health assessment. To understand what this means for your health, it's helpful to consider your height and age, as these determine your BMI category according to NHS guidelines. For example, at a height of 5ft 4in (163cm), a weight of 57kg gives a BMI of approximately 22.5, which falls into the healthy weight range (18.5–24.9) set by the NHS. However, if you're taller or shorter, your BMI category will differ. Use our free BMI calculator above to check your personal BMI and see where you fall on the NHS scale. The NHS also recommends monitoring waist circumference alongside weight, as where fat is stored matters for health risk.
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 and Next Steps
If you're interested in weight management or want to understand your current health status, speaking with your GP is the best starting point. Your doctor can assess your individual circumstances, consider any underlying health conditions, and advise whether your current weight is healthy for you. They may also refer you to NHS weight management services if appropriate. You can also track changes in your weight over time using our free progress tracker, which helps you see trends and stay motivated. Remember that healthy weight is individual—factors like muscle mass, genetics, and overall fitness all play a role.
- 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 57kg to stone manually?
Divide 57 by 6.35029 to get stone. 57 ÷ 6.35 = 8.98 stone, which equals 8 stone and 12.8 pounds. Our weight converter above does this instantly—simply enter 57 and select kg to stone conversion.
Is 57kg a healthy weight for me?
This depends on your height, age, and other factors. Calculate your BMI using our free BMI calculator above by entering 57kg and your height—the NHS recommends a healthy BMI of 18.5–24.9 for most adults. Your GP can also advise based on your individual health.
What does 57kg equal in just pounds?
57kg equals approximately 125.7 pounds. You can use our weight converter to switch between any metric and imperial measurements instantly.
How is 57kg compared to average UK weight?
According to Office for National Statistics data, the average UK woman weighs approximately 71.6kg (11st 3lbs) and the average UK man weighs approximately 85.7kg (13st 7lbs). At 57kg, you're below the national average, but what matters most is whether your weight is healthy for your individual height and circumstances.
Should I aim to reach or maintain 57kg?
This is personal and depends on your height, health status, and goals. The NHS recommends aiming for a BMI between 18.5 and 24.9, and a weight loss of 0.5–1kg per week if you choose to change. Speak with your GP for personalised advice on healthy weight 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.