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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57 Kilos to Stones and Pounds — Healthy Weight Guide
57 kilograms converts to 8 stone 13.3 pounds (or 8st 13lbs). Whether this weight is healthy depends entirely on your height, age, and overall health. Using our free BMI calculator above, you can check whether 57kg falls within a healthy range for your specific height. This guide explains how to convert kilos in stone and pounds, and shows you what a healthy weight means according to NHS guidance for UK adults.
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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.
Healthy Weight Range at Different Heights
To understand if 57kg is a healthy weight for you, you need to know your height. 57kg is a healthy weight for taller adults, but may be underweight for shorter individuals. The table below shows healthy weight ranges using the stone to kg conversion standard across common UK heights:
- 5ft 0in (152cm): Healthy range 47–64kg (7st 6lbs – 10st 1lbs) — 57kg is above healthy
- 5ft 4in (163cm): Healthy range 49–67kg (7st 10lbs – 10st 7lbs) — 57kg is healthy
- 5ft 8in (173cm): Healthy range 52–71kg (8st 3lbs – 11st 3lbs) — 57kg is healthy
- 5ft 10in (178cm): Healthy range 55–74kg (8st 9lbs – 11st 9lbs) — 57kg is healthy
- 6ft 0in (183cm): Healthy range 59–78kg (9st 3lbs – 12st 4lbs) — 57kg is below healthy
These ranges are based on kilogram to stone conversion using a BMI of 18.5 to 24.9, which is the NHS standard for healthy weight. Check your personal healthy range using our free BMI calculator above.
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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.
What If Your Weight Falls Outside the Healthy Range?
If 57kg is below or above your personal healthy range, NHS guidance suggests taking action. If you're underweight (BMI below 18.5), speak to your GP about nutrition and whether any underlying health conditions need investigating. If you're overweight (BMI above 25), the NHS recommends sustainable changes: eat a balanced diet, increase physical activity, and aim to lose no more than 0.5–1kg per week. Waist measurement also matters — even at a healthy weight, excess weight around the middle increases health risks. For men, aim for under 94cm (37 inches); for women, under 80cm (31.5 inches). Your GP can provide personalised advice about weight management and health goals.
- 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?
57 kilograms equals 8 stone and 13.3 pounds (8st 13lbs when rounded). To convert any weight using the kg to stone formula, divide kilograms by 6.35029. For example: 57 ÷ 6.35029 = 8.98 stone.
Is 57kg a healthy weight for everyone?
No — 57kg is healthy only for taller adults (approximately 5ft 4in and above). At shorter heights, 57kg may be overweight. At taller heights, it may be underweight. Use our free BMI calculator above to check your personal healthy range based on your exact height.
How do I calculate my own healthy weight range?
Your healthy BMI range is 18.5 to 24.9. Multiply your height in metres squared by these numbers to get your healthy weight range in kilograms. For example, at 1.70m: (18.5 × 1.70²) to (24.9 × 1.70²) = 53.4–71.6kg. Our BMI calculator does this instantly.
What should I do if my weight is outside the healthy range?
If underweight, speak to your GP about nutrition and health. If overweight, aim for gradual weight loss (0.5–1kg per week) through balanced eating and increased activity. Also check your waist measurement — excess weight around the middle is a health risk even at a healthy BMI. Use our free progress tracker to log your journey.
Are there other ways to assess my health besides weight?
Yes. Waist circumference, blood pressure, blood sugar, and cholesterol are also important. BMI doesn't account for muscle mass (athletes may have high BMI but good health) or where fat is stored. Your GP can give a full health assessment beyond weight alone.
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.