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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118 Lbs Into Stone — What's Your BMI?
118 lbs is equivalent to 8 stone 6 pounds, or approximately 53.5 kg. However, your BMI and health category depend entirely on your height. The same weight produces very different BMI values depending on how tall you are. This guide shows you what BMI 118 lbs gives at different heights, and where that sits within NHS weight categories. Use our free BMI calculator above to find your exact BMI instantly, or read on for height-by-height context.
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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.
118 Lbs BMI at Different Heights
At 118 lbs (53.5 kg), your BMI varies significantly by height. Here's how this weight translates across common UK heights:
- 5ft 2in (157 cm): BMI 19.5 — Healthy weight (NHS category)
- 5ft 4in (163 cm): BMI 18.8 — Healthy weight
- 5ft 6in (168 cm): BMI 18.2 — Healthy weight
- 5ft 8in (173 cm): BMI 17.6 — Underweight (below 18.5)
- 5ft 10in (178 cm): BMI 17.0 — Underweight
- 6ft 0in (183 cm): BMI 16.4 — Underweight
At lower heights, 118 lbs falls comfortably within the healthy weight range. At taller heights, it may indicate being underweight. Your GP can assess whether this weight is appropriate for your individual health circumstances, especially if you have health conditions or are experiencing unintended weight changes.
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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 & Weight Context
The NHS defines healthy BMI as 18.5 to 24.9 for most UK adults. At 118 lbs, shorter individuals (around 5ft 2in–5ft 6in) are likely in this range, whilst taller adults may be below 18.5, which is classified as underweight. It's important to note that BMI doesn't account for muscle mass, bone density, or where fat is stored — it's a screening tool, not a diagnostic measure. For South Asian, Chinese, Black African, and Black Caribbean adults, the NHS recommends slightly lower thresholds (18.5–22.9 for healthy weight). Our free weight converter above lets you check this weight in different units, and you can explore your BMI context using the BMI calculator on this page.
- 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 118 lbs in stone and pounds?
118 lbs is exactly 8 stone 6 pounds. To convert any weight in lbs to stone to kg conversion, divide by 6.35029 to get kilograms (118 lbs = 53.5 kg), or divide by 14 to get stone. The imperial to metric conversion is straightforward once you know the multiplier.
Is 118 lbs a healthy weight?
It depends on your height. At heights 5ft 2in to 5ft 6in, 118 lbs is likely a healthy weight (BMI 18.2–19.5). At taller heights, it may be underweight. Your GP can advise whether this weight is right for you based on your individual health, age, and medical history.
Why does BMI differ based on height when the weight is the same?
BMI accounts for both weight and height — the formula is weight (kg) divided by height (m) squared. Taller people naturally have lower BMI at the same weight, because their body is distributed across a greater frame. This is why kilogram to stone conversion alone isn't enough to assess health.
What if my BMI at this weight is underweight?
If your BMI is below 18.5, speak to your GP before making dietary changes. Underweight can indicate nutritional deficiencies, medical conditions, or other health concerns. Your GP can assess your individual circumstances and recommend appropriate support if needed.
Can I use stone and pounds measurements with the BMI calculator?
Yes — the BMI calculator on this page accepts stone, pounds, and kilograms. Simply enter your weight in whichever unit you prefer, enter your height, and the calculator will give your exact BMI and NHS category instantly. Converting 118 lbs to stone first (8st 6lbs) is optional — the tool handles both.
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.