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 55 Kg in Stone? BMI and Health Context
55 kilograms is equivalent to 8 stone 8.4 pounds in UK measurements. However, your BMI — which combines your weight with your height — gives a much clearer picture of whether 55 kg is a healthy weight for you personally. At different heights, 55 kg produces different BMI values, some falling in the healthy range and others in the overweight category according to NHS guidelines. Use our free BMI calculator above to find your exact BMI, or read on to see what 55 kg means at various heights.
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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.
55 Kg BMI at Different Heights
At 55 kg, your BMI depends entirely on your height. Here's what 55 kg produces across common UK heights:
- At 150 cm (4ft 11in): BMI of 24.4 — healthy weight range
- At 155 cm (5ft 1in): BMI of 22.9 — healthy weight range
- At 160 cm (5ft 3in): BMI of 21.5 — healthy weight range
- At 165 cm (5ft 5in): BMI of 20.2 — healthy weight range
- At 170 cm (5ft 7in): BMI of 19.0 — healthy weight range
- At 175 cm (5ft 9in): BMI of 17.9 — underweight range
These calculations use the standard kilogram to stone conversion formula and NHS BMI categories. If you're at the lower end, ensure you're eating enough to support your health. Calculate your personal BMI using the free converter tool on this page by entering 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.
NHS BMI Categories and Limitations
According to NHS guidelines, a healthy BMI for most adults is between 18.5 and 24.9. At 55 kg, you may fall within this range depending on your height — which is why height matters so much. The NHS also recognises that BMI has limitations: it doesn't account for muscle mass, bone density, or where fat is stored on your body. For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower BMI thresholds due to higher cardiovascular risk at the same BMI. Your GP can discuss your individual health context and whether 55 kg is right for you.
- 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 55 kg a healthy weight?
It depends on your height. At 55 kg, most people between 150 cm and 175 cm fall within the NHS healthy weight range (BMI 18.5–24.9). Use the BMI calculator on this page with your exact height to find out. If you're significantly taller or shorter, the answer changes. Your GP can also assess your overall health beyond just BMI.
What is 55 kg in stone and pounds?
55 kg converts to 8 stone 8.4 pounds (often written as 8st 8lbs). To convert kilograms to stone yourself, divide the kg by 6.35. Weight in stone is the traditional UK measurement, though the NHS uses kilograms clinically.
How do I know if my weight is healthy?
Calculate your BMI using the free BMI calculator on this page — enter your weight and height. Your BMI score tells you which NHS category you fall into: underweight, healthy, overweight, or obese. However, BMI is just one indicator. Your waist circumference, blood pressure, fitness level, and overall health habits matter too.
Should I try to change my weight at 55 kg?
Only your GP can advise whether your weight needs to change. If you fall in the healthy BMI range and feel well, no change may be needed. If you have health concerns or fall outside the healthy range for your height, speak to your GP about safe, sustainable approaches to weight management.
Does 55 kg mean different things for men and women?
BMI applies equally to men and women — the same BMI formula and NHS categories apply to both. However, body composition differs slightly between sexes, and some health conditions are more common in women or men at the same weight. Your GP considers your individual circumstances.
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.