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 55kg in Stone? UK Weight Conversion Guide
55kg converts to 8 stone 8.7 pounds (or 8st 8.7lbs in UK notation). If you're tracking your weight using UK measurements or comparing your weight to NHS health guidelines, understanding this conversion is useful for health planning. This guide explains the conversion, what it means for your health according to UK standards, and how to use our free weight converter tool to check your personal measurements instantly.
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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.
Converting 55kg to Stone — The Calculation
The exact conversion from kilograms to stone uses a straightforward formula: divide kilograms by 6.35029. For 55kg, the calculation is 55 ÷ 6.35029 = 8.667 stone, which equals 8 stone 9.3 pounds (or approximately 8st 8.7lbs in common UK usage).
To break this down further: one stone equals exactly 14 pounds, so 0.667 stone × 14 = 9.3 pounds. You can also convert 55kg directly to pounds (55 × 2.20462 = 121.3 lbs) and then divide by 14 to get stone. Use our free weight converter above to instantly convert between kg, stone, and pounds — it's useful for tracking measurements across different systems without a UK pharmacy calculation.
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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.
Is 55kg a Healthy Weight? UK NHS Guidance
Whether 55kg is a healthy weight depends on your height and age. According to NHS guidelines, a healthy BMI (body mass index) falls between 18.5 and 24.9. For someone 160cm tall, 55kg gives a BMI of approximately 21.5, which is within the healthy range. For someone 180cm tall, the same weight would give a BMI of around 16.9, which is below the healthy threshold.
The NHS recommends using your BMI as a screening tool alongside other health markers like waist circumference and overall fitness. Calculate your personal BMI instantly using our free BMI calculator above — it will show you where your weight sits relative to UK health guidelines. If you're concerned about your weight or health, discuss it with your GP, who can provide personalised advice based on your individual circumstances.
- 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 55kg to stone without a calculator?
Divide 55 by 6.35029, which gives approximately 8.67 stone. Multiply the decimal (0.67) by 14 to get pounds: 0.67 × 14 = 9.4 pounds. So 55kg = 8 stone 9 pounds. For quick mental maths, remember that 6.35kg ≈ 1 stone, so 55kg is roughly 8.5–9 stone.
Is 55kg underweight, normal, or overweight?
At 55kg, you cannot determine if it's healthy without knowing your height. A 160cm tall person at 55kg has a healthy BMI of 21. A 180cm tall person at 55kg has a BMI of 16.9, which is below healthy. Use our free BMI calculator above to check your personal status based on your actual height.
What's the difference between stone, pounds, and kilograms?
Stone and pounds are UK imperial measurements; kilograms are metric. 1 stone = 14 pounds exactly. 1 kilogram = 2.20462 pounds. The UK commonly uses stone for body weight, although NHS clinical records use kilograms. Our weight converter above lets you switch between all three instantly.
Should I aim for 55kg as my target weight?
Your ideal weight depends on your height, age, sex, muscle mass, and overall health. The NHS recommends aiming for a BMI between 18.5 and 24.9 rather than targeting a specific weight. Speak with your GP about what healthy weight range is right for you personally.
How do I track weight changes between kg and stone?
Use our free progress tracker to log your weight in your preferred unit (kg, stone, or pounds). The tracker automatically converts between units, so you can monitor your health journey consistently. You can also print or share your progress to discuss with your GP or healthcare provider.
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.