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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What's Your BMI at 118kg? Height Matters
At 118kg, your BMI depends entirely on your height. This weight falls into the overweight or obese range for most UK adults, but the exact category is determined by how tall you are. Using our free BMI calculator above, you can find your precise BMI instantly. First, let's convert: 118kg equals 18 stone and 8 pounds in UK measurements. Understanding where your weight sits within NHS guidelines helps you make informed health decisions. This guide shows you the BMI ranges at different heights for this weight, plus what each category means for your health.
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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.
BMI at 118kg — Height-Specific Ranges
To convert 118kg to kilos in stone, you get 18 stone 8 lbs. However, BMI isn't about the number alone — it's about how that weight relates to your height. Here are BMI values at 118kg across common UK heights:
- 5ft 2in (158cm): BMI 31.4 — Obese (Class I)
- 5ft 5in (165cm): BMI 29.2 — Overweight
- 5ft 8in (173cm): BMI 27.3 — Overweight
- 5ft 10in (178cm): BMI 25.5 — Overweight
- 6ft 0in (183cm): BMI 23.8 — Healthy weight
- 6ft 2in (188cm): BMI 22.3 — Healthy weight
Use the weight converter on this page to confirm how 118kg translates to your preferred imperial measurements, then check your personal BMI using our free BMI calculator above.
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.
Understanding Your BMI Category
According to NHS guidelines, BMI categories are: Healthy weight (18.5–24.9), Overweight (25–29.9), and Obese (30+). At 118kg, unless you're taller than 6ft, you're likely in the overweight or obese range. However, BMI has limitations — it doesn't distinguish between muscle and fat, so athletes may have a higher BMI without excess body fat. It also doesn't account for where fat is stored (waist circumference matters too). For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower BMI thresholds due to higher health risks at the same weight. Your GP can provide personalised advice about what your BMI means for your individual health.
- 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 118kg in stones and pounds?
118kg equals 18 stone and 8 pounds in UK measurements. You can verify this using the weight converter on this page, which converts between kg, stone, and lbs instantly. The exact conversion is 118kg = 18.58 stone.
Is 118kg overweight or obese?
At 118kg, your category depends on your height. For most UK adults under 5ft 10in, this weight falls into the obese range. For taller adults (over 6ft), it may be in the healthy or overweight range. Use our free BMI calculator above to find your exact category.
What's the healthy weight range for my height?
The healthy weight range depends on your height. For example, at 5ft 8in, the healthy BMI range is approximately 55–75kg. Our BMI calculator shows the healthy weight range for your specific height instantly — just enter your measurements above.
Why does BMI vary with height at the same weight?
BMI measures weight in relation to height squared, not weight alone. The same weight distributed across a taller frame results in a lower BMI. This is why BMI is more useful than weight alone for assessing health risk — it accounts for your frame size.
Should I lose weight at 118kg?
Whether weight loss is appropriate depends on your BMI, health conditions, and GP advice. If you're in the overweight or obese range, modest weight loss (5–10% of body weight) can bring significant health benefits. Your GP can advise on safe, sustainable approaches for your individual situation.
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.