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 18 Stone in Pounds?
18 stone is equal to 252 pounds (lbs). This is a straightforward UK-to-imperial weight conversion using the standard ratio of 14 pounds per stone. If you're checking your weight, tracking progress, or simply need to convert between UK measurements and pounds, this guide explains the conversion and provides NHS health context. Use our free weight converter above to switch between stone, pounds, and kilograms instantly—all measured in UK units that make sense for your health journey.
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.
UK Weight Conversion and Health Context
In the UK, we commonly measure body weight in stone and pounds, where 1 stone equals exactly 14 pounds. To convert 18 stone to pounds, you multiply by 14: 18 × 14 = 252 lbs. For metric context, 18 stone is approximately 114.3 kg—useful if you're using NHS health tools or international health references.
Understanding your weight in different units helps when using health calculators, tracking fitness progress, or discussing health with your GP. The NHS uses kilograms for clinical measurements, but many UK adults still think in stone and pounds. Having this conversion knowledge makes it easier to interpret BMI charts, healthy weight ranges, and weight loss targets that may be presented in different units.
If you're 18 stone, your health context depends on your height, age, and overall fitness. Use our free BMI calculator above to check where your weight sits relative to NHS healthy weight guidelines for your height—this gives you a personalised health picture beyond just the number on the scales.
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
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 18 Stone a Healthy Weight?
Whether 18 stone (252 lbs) is healthy depends entirely on your height. According to NHS guidelines, a healthy BMI is 18.5 to 24.9 kg/m². For example, an adult who is 5ft 10in tall would have a BMI of approximately 32.6 at 18 stone—classified as obese (Class I). However, someone 6ft 3in tall would have a BMI around 26.6—classified as overweight but not obese.
If you're concerned about whether your weight affects your health, your GP can provide personalised advice based on your individual circumstances, including your fitness level, family health history, and any existing health conditions. Even modest weight loss of 5–10% can bring real health benefits. Track your progress using our free progress tracker and consider discussing weight management options with your GP if you'd like support.
- 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.
How many pounds is 18 stone?
18 stone equals exactly 252 pounds. This uses the standard UK conversion where 1 stone = 14 pounds. To convert any stone weight to pounds, multiply the stone amount by 14. For example, 10 stone = 140 lbs, 15 stone = 210 lbs.
What is 18 stone in kilograms?
18 stone is approximately 114.3 kg. The conversion formula is: stone × 6.35029 = kilograms. This metric measurement is used by the NHS for clinical health records and health calculators, making it useful to know both UK and metric conversions.
Is 18 stone overweight according to the NHS?
It depends on your height. At 18 stone, your BMI classification varies significantly based on how tall you are. Use our free BMI calculator on this page to enter your height and get your personal BMI category according to NHS guidelines—this gives you accurate health context.
How can I track my weight if I'm 18 stone?
You can track your weight in stone and pounds, kilograms, or a combination. Our free progress tracker allows you to log your weight in your preferred unit and visualise changes over time. Many people find it motivating to see progress recorded consistently, whether monthly or weekly.
Should I speak to my GP about being 18 stone?
If you have concerns about your weight or health, it's always worth discussing with your GP. They can assess your individual situation, including your height, fitness, and health conditions. Your GP can discuss whether weight management might benefit your health and what support options are available through the NHS.
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.