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 is 55kg in UK Measurements?
55kg is equivalent to 8 stone 8.6 lbs in UK measurements, or approximately 121.3 pounds. Whether you're tracking your weight for health reasons, following NHS guidance, or simply curious about what this weight means for your health, understanding your weight in familiar UK units is the first step. This guide explains where 55kg sits on the BMI scale, what it means for your health, and how to use this information alongside personalised NHS health advice.
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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.
55kg Conversion & BMI Context
55kg in stone and pounds: 8 stone 8.6 lbs (or approximately 8st 9lbs). To convert your weight using the standard kg to stone conversion, divide 55 by 6.35. Using our free weight converter above, you can switch between kg, stone, and pounds instantly.
Your BMI at 55kg depends on your height. For example, at an average UK adult height of 163cm (5ft 4in), a weight of 55kg gives a BMI of approximately 20.7, which falls in the healthy weight range (18.5–24.9) according to NHS guidelines. However, at 170cm (5ft 7in), the same weight gives a BMI of around 19, still healthy. Use our free BMI calculator above to find your personal BMI and what it means for your health based on your exact height.
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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?
Whether 55kg is healthy depends entirely on your height, age, ethnicity, and individual health circumstances. For most UK adults of average height (163–178cm), 55kg would typically fall in the healthy weight range according to NHS guidance. However, BMI is a screening tool only — it does not account for muscle mass, bone density, or where fat is stored. Your GP can provide personalised advice about whether 55kg is appropriate for you. If you have concerns about your weight or health, your healthcare professional can give context based on your full health picture and medical history.
- 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 lbs?
55kg equals 8 stone 8.6 lbs (approximately 8st 9lbs), or 121.3 pounds. Use our weight converter above to switch between metric and imperial measurements instantly.
What BMI does 55kg give?
Your BMI at 55kg depends on your height. At 163cm (5ft 4in) it's around 20.7 (healthy), at 170cm (5ft 7in) it's around 19 (healthy). Calculate your exact BMI using our free BMI calculator above.
Is 55kg underweight or healthy?
For most UK adults of average to tall height, 55kg falls in the healthy weight range. However, BMI alone doesn't tell the full story — muscle mass and health conditions matter. Speak to your GP for personalised guidance.
How does 55kg compare to average UK weight?
The average UK adult woman weighs approximately 71.6kg (11st 3lbs) and the average UK adult man weighs 85.7kg (13st 7lbs). 55kg is below average, but "average" doesn't mean healthy — your individual context is what matters.
What should I do if I'm concerned about a weight of 55kg?
If you have concerns about whether 55kg is healthy for you, or if you're experiencing weight-related symptoms, speak to your GP. They can assess your health in context and provide personalised guidance based on your age, height, fitness level, and medical history.
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.