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 Kg In Stones And Pounds?
57 kilograms converts to 8 stone and 12.4 pounds (or 8st 12lbs for short). However, whether this weight is healthy for you depends entirely on your height. BMI takes both weight and height into account, which is why the same weight gives very different BMI values at different heights. Use our free BMI calculator above to find your personal BMI instantly, or read on to see what 57kg means at 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.
57 Kg BMI At Different Heights
To convert 57kg to stone and pounds, simply divide by 6.35 — this gives 8 stone and 12.4 pounds. But to understand if this is a healthy weight for you, you need to calculate your BMI. Here's what 57kg gives at common heights:
- 160 cm (5ft 3in): BMI of 22.3 — Healthy weight (NHS category)
- 165 cm (5ft 5in): BMI of 20.9 — Healthy weight
- 170 cm (5ft 7in): BMI of 19.7 — Healthy weight
- 175 cm (5ft 9in): BMI of 18.6 — Healthy weight
- 180 cm (5ft 11in): BMI of 17.6 — Underweight
At most heights, 57kg falls into the healthy weight range according to NHS guidelines. The weight converter tool on this page helps switch between kilos in stone and metric to imperial measurements instantly.
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 BMI Categories And What They Mean
The NHS uses standard BMI categories for UK adults. A healthy BMI sits between 18.5 and 24.9, overweight is 25.0 to 29.9, and obese starts at 30.0. At 57kg, you're likely in the healthy range unless you're particularly tall. However, BMI has limitations — it doesn't account for muscle mass or where fat is stored around your body. Your waist circumference matters too: the NHS recommends keeping waist below 94cm (men) or 80cm (women) for good health. If you're concerned about your weight or health, your GP can provide personalised advice based on your complete health picture, not just a number on the scale.
- 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.
Is 57kg a healthy weight?
At 57kg, you're likely in a healthy weight range for most heights. Calculate your BMI using our free BMI calculator above to check your personal result. If your BMI falls between 18.5 and 24.9, that's considered healthy by NHS standards. Remember, healthy weight varies by height, muscle mass, and individual factors.
How do I convert 57kg to stones and pounds?
Divide 57 by 6.35 to get stones, which equals 8 stone 12.4 pounds (or 8st 12lbs). Use our weight converter on this page to switch between metric and imperial measurements instantly. This makes it easy to understand your weight in UK measurements.
What's the formula for BMI?
BMI equals your weight in kilograms divided by your height in metres squared. For 57kg at 170cm, that's 57 ÷ (1.7 × 1.7) = 19.7 BMI. Our free BMI calculator does this instantly — just enter your weight and height to see your result.
Do I need to lose weight at 57kg?
Whether you need to lose weight depends on your height and overall health, not just the number 57kg. At 57kg, most people fall into a healthy weight range. Your GP can advise if weight loss is right for you. Focus on how you feel — energy levels, fitness, and health markers matter more than hitting a specific weight.
What BMI counts as underweight?
A BMI below 18.5 is classified as underweight by NHS guidelines. At 57kg, you'd need to be quite tall (around 180cm or above) to fall into this category. If your BMI is below 18.5, speak to your GP about whether you need nutritional support.
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.