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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55kg in Stone — Quick Conversion & Health Context
55kg is equivalent to 8 stone and 9.6 pounds in UK measurements. If you're checking your weight in stone and pounds or comparing your kilos in stone for health purposes, this conversion helps you understand where you fall on NHS health guidelines. Use our free weight converter to switch between metric and imperial measurements instantly, and check your BMI using our free BMI calculator to see how this weight relates to your personal health profile.
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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.
How to Convert 55kg to Stone
55kg = 8 stone 9.6 pounds (or 8st 9.6lbs)
The standard kg to stone conversion formula is straightforward: divide your weight in kilograms by 6.35029. For 55kg: 55 ÷ 6.35029 = 8.67 stone, which equals 8 stone plus 9.6 pounds. To convert kilograms to stone accurately, remember that one stone equals exactly 6.35029kg and one stone equals 14 pounds.
Here's a table of nearby values for reference:
- 50kg = 7st 12.8lbs
- 52kg = 8st 2.4lbs
- 54kg = 8st 7.9lbs
- 55kg = 8st 9.6lbs
- 56kg = 8st 11.2lbs
- 58kg = 9st 1.7lbs
- 60kg = 9st 6.4lbs
Clinically BackedWeight Loss
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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.
55kg Health Context — BMI & Healthy Weight
At 55kg, your health profile depends entirely on your height. For example, at the average UK female height of 161.6cm (5ft 3in), a weight of 55kg gives a BMI of approximately 21.1 — well within the healthy range of 18.5 to 24.9. At an average UK male height of 175.3cm (5ft 9in), 55kg would give a BMI of around 17.9, which falls into the underweight category. Use our free BMI calculator above to calculate your personal BMI based on your exact height and see where you sit on NHS guidelines. This gives you a complete picture of whether your weight is healthy for 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.
What is 55kg in stone and pounds?
55kg equals 8 stone and 9.6 pounds (8st 9.6lbs). To calculate this yourself, divide 55 by 6.35029 to get 8.67 stone, then multiply the decimal by 14 to get the extra pounds.
Is 55kg a healthy weight?
Whether 55kg is healthy depends on your height. Use our free BMI calculator to find your personal BMI. At average UK female height (5ft 3in), 55kg gives a healthy BMI of around 21. Always consult your GP for personalised health advice based on your individual circumstances.
How do I convert kg to stone quickly?
Divide your weight in kilograms by 6.35029 to get stone. For example: 55kg ÷ 6.35029 = 8.67 stone. The decimal represents additional pounds — multiply by 14 to get the exact pounds: 0.67 × 14 = 9.6 pounds.
What is the metric to imperial weight conversion?
The metric to imperial weight conversion uses these factors: 1kg = 2.20462 pounds, and 1 stone = 6.35029kg. So 55kg converts to approximately 121.3 pounds, or 8 stone 9.6 pounds in stone and pounds format.
How does 55kg compare to average UK weight?
The average UK adult woman weighs approximately 71.6kg (11st 3lbs), so 55kg is noticeably lighter. The average UK adult man weighs approximately 85.7kg (13st 7lbs). Individual healthy weight varies by height, age, and build — your GP can advise what's healthy for you.
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.