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 5.5 Stone in Kilograms?
5.5 stone is equal to approximately 34.9 kg. This conversion uses the standard stone to kilogram formula used across the NHS and UK health services. Stone and pounds remain the most common way UK adults discuss body weight, but kilograms are used in clinical settings and international health contexts. If you need to convert between different weight units regularly, our free weight converter above lets you switch between kg, stone, and pounds instantly.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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.
Stone to Kg Conversion Formula and Nearby Values
To convert 5.5 stone to kilograms, use this simple formula: stone × 6.35029 = kg. So 5.5 × 6.35029 = 34.93 kg (rounded to 34.9 kg).
Here are nearby values to help you see the full range of the stone to kg conversion:
- 5.0 stone = 31.75 kg
- 5.2 stone = 32.98 kg
- 5.4 stone = 34.25 kg
- 5.5 stone = 34.93 kg
- 5.6 stone = 35.56 kg
- 5.8 stone = 36.81 kg
- 6.0 stone = 38.10 kg
The kilogram to stone conversion is straightforward once you remember the multiplier. For converting kilograms in stone in the opposite direction, divide by 6.35029.
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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.
BMI and Healthy Weight Context at 5.5 Stone
At 5.5 stone (34.9 kg), your BMI depends on your height. For example, at an average UK female height of 5ft 4in (163 cm), a weight of 5.5 stone gives a BMI of approximately 20.9 — which falls comfortably in the healthy weight range of 18.5 to 24.9 according to NHS guidelines. However, at a taller height of 5ft 9in (175 cm), the same weight would result in a BMI of around 16.2, which is slightly below the healthy range. Use our free BMI calculator above to check what your personal BMI is and whether your weight sits in the recommended range for your specific height.
- 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.
Is 5.5 stone a healthy weight?
Whether 5.5 stone is healthy depends entirely on your height and overall health. Use the BMI calculator on this page to find your personal BMI — this gives a better indicator of whether your weight is in the healthy range for your height according to NHS guidelines. Your GP can also discuss your individual health context with you.
How do I convert stone to kg quickly?
Multiply the stone value by 6.35029. So 5.5 × 6.35029 = 34.93 kg. Our free weight converter above also does this instantly — just enter the value in stone and it converts to kg, lbs, and all other units automatically.
What is 5.5 stone in pounds?
5.5 stone equals 77 pounds (since 1 stone = 14 lbs, so 5.5 × 14 = 77 lbs). You can also express this as 5 stone 7 pounds in traditional UK format.
How does 5.5 stone compare to average UK weight?
The average UK adult woman weighs around 71.6 kg (11st 3lbs), and the average UK adult man weighs approximately 85.7 kg (13st 7lbs). At 5.5 stone (34.9 kg), this weight is below average for adults, which may indicate a younger person, a smaller-framed adult, or someone at a lower end of the healthy weight spectrum.
What conversions are most useful to remember?
The key conversions are: 1 stone = 6.35 kg, 1 stone = 14 pounds, and 1 kg = 2.20462 lbs. Using these multipliers, you can convert between any UK weight units. Our weight converter handles these instantly if you prefer not to calculate manually.
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.