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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What is 57 kg in Pounds?
57 kilograms equals approximately 125.7 pounds (or 125 lbs 11 oz). However, whether this weight is healthy for you depends entirely on your height. Using our free weight converter, you can instantly switch between kg, stone, and pounds. To understand what this weight means for your health, you'll need to calculate your BMI — the standard NHS health screening tool. Below we show what BMI 57kg gives at different heights, plus which NHS categories apply to you.
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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
Your BMI at 57kg varies significantly depending on your height. Here's what 57 kilograms means in terms of BMI across common UK heights:
- At 5ft 2in (157cm): BMI of 23.1 — falls in the healthy weight range (18.5–24.9)
- At 5ft 4in (163cm): BMI of 21.5 — healthy weight range
- At 5ft 6in (168cm): BMI of 20.1 — healthy weight range
- At 5ft 8in (173cm): BMI of 19.1 — healthy weight range
- At 5ft 10in (178cm): BMI of 18.0 — falls just below healthy weight threshold
- At 6ft (183cm): BMI of 17.0 — underweight by NHS standards
Calculate your exact BMI using the free BMI calculator on this page by entering your own height and 57kg weight. Remember that BMI is a screening tool — it doesn't account for muscle mass or body composition, so it's always worth discussing your results with your GP.
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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.
NHS BMI Categories and What They Mean
The NHS divides adults into BMI categories that guide health risk assessment. A healthy weight BMI is 18.5 to 24.9 — most people with 57kg fall into this range depending on height. Below 18.5 is classified as underweight, 25–29.9 is overweight, and 30 or above is obese. For people of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends slightly lower thresholds because these groups face higher disease risk at the same BMI. BMI has limitations — it cannot distinguish muscle from fat, so athletes may have a high BMI despite low body fat. Your waist measurement and overall fitness matter too. Use our weight converter to check your weight in stone and pounds, then discuss your personal health with your GP.
- 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 pounds exactly?
57 kg equals 125.66 pounds (or approximately 125.7 lbs). To convert: multiply 57 by 2.20462. In stone and pounds, 57kg is 8 stone 13.7 lbs. Use our free weight converter above to instantly convert between all three measurements.
Is 57 kg a healthy weight?
Whether 57kg is healthy depends on your height and individual health factors. At 5ft 4in–5ft 8in, this weight typically falls into the NHS healthy BMI range. At shorter heights (under 5ft 2in) it may be slightly high; at taller heights (over 6ft) it may be slightly low. Use our free BMI calculator to check your personal BMI.
What's my BMI if I weigh 57 kg and I'm 5ft 6in tall?
At 57kg and 5ft 6in (168cm), your BMI is approximately 20.1, which falls comfortably in the NHS healthy weight range of 18.5–24.9. This is considered a healthy weight for your height. However, other factors like waist circumference and overall fitness also matter for health assessment.
How do I convert 57 kilograms to stone?
Divide 57 by 6.35029 to get stone. 57kg = 8 stone 13.7 lbs. The easiest way is to use our free weight converter on this page — just enter 57kg and it instantly shows stone, pounds, and kilograms all together.
Is BMI the only way to assess if 57 kg is healthy?
No. BMI is a useful screening tool but has limitations — it doesn't show where fat is stored or account for muscle mass. The NHS also recommends measuring waist circumference (over 94cm in men or 80cm in women indicates increased health risk) and discussing your overall health with your GP for personalised advice.
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.