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's 57.5kg in Stone and What's Your BMI?
57.5kg converts to 9 stone and 1.5 pounds (9st 1.5lbs) in UK measurements. However, your BMI at this weight depends entirely on your height — the same weight can be healthy, overweight, or obese depending on how tall you are. Use our free BMI calculator above to find your personal BMI instantly, or read on to see example BMI values at different heights for someone weighing 57.5kg.
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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.
57.5kg BMI at Different Heights
Here's what 57.5kg means in terms of BMI across typical UK adult heights. Remember, BMI is calculated by dividing weight (kg) by height (metres) squared. According to NHS guidelines, a healthy BMI is between 18.5 and 24.9.
- At 5ft 0in (152cm): BMI = 24.9 (healthy weight)
- At 5ft 2in (158cm): BMI = 23.0 (healthy weight)
- At 5ft 4in (163cm): BMI = 21.6 (healthy weight)
- At 5ft 6in (168cm): BMI = 20.4 (healthy weight)
- At 5ft 8in (173cm): BMI = 19.2 (healthy weight)
- At 5ft 10in (178cm): BMI = 18.1 (underweight)
Use the weight converter on this page to see 57.5kg expressed in stone and pounds, then combine it with our free BMI calculator to check your exact personal BMI.
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.
Understanding BMI Categories and Limitations
The NHS BMI categories are: underweight (below 18.5), healthy weight (18.5–24.9), overweight (25.0–29.9), obese (30.0–34.9), and severely obese (40.0+). However, BMI has important limitations — it doesn't distinguish between muscle and fat, so athletes may have a high BMI despite being fit. It also doesn't account for where fat is stored; waist circumference matters too. For South Asian, Chinese, Black African, and Black Caribbean adults, the NHS recommends lower BMI thresholds because these groups face higher health risks at the same BMI level. Your GP can give personalised advice about what your BMI means for your individual 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 57.5kg in stone and pounds?
57.5kg equals 9 stone and 1.5 pounds (9st 1.5lbs) using the standard UK weight conversion. To convert kilograms to stone, divide by 6.35029. Use the weight converter on this page for instant conversions between kg, stone, and pounds.
Is 57.5kg a healthy weight?
It depends on your height. At 57.5kg, you could be in the healthy, overweight, or underweight category depending on how tall you are. For example, at 5ft 6in it's healthy; at 5ft 10in it's underweight. Calculate your personal BMI using our free tool to find out.
What's the difference between kg to stone conversion and BMI?
Converting kg to stone is simply changing the unit of measurement — 57.5kg will always be 9st 1.5lbs. BMI, however, combines your weight with your height to assess health risk. The same weight gives different BMI values at different heights.
How do I know if my weight is healthy?
Check your BMI using your height and weight. A healthy BMI is 18.5–24.9 according to NHS guidelines. However, BMI doesn't account for muscle mass, where fat is stored, or individual health factors. Your GP can provide personalised guidance.
Why do ethnicity-adjusted BMI thresholds exist?
Research shows that people of South Asian, Chinese, Black African, and Black Caribbean heritage have higher health risks at lower BMI levels. The NHS recommends lower thresholds for these groups — healthy BMI starts at 18.5 but overweight begins at 23.0 instead of 25.0.
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.