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
Convert 13.5 Stone to Pounds
13.5 stone is equal to 189 pounds (lbs). This conversion uses the standard UK measurement where 1 stone equals exactly 14 pounds. If you're checking your weight for health purposes, understanding your weight in different units helps you compare it against NHS guidance and calculate your BMI. Our free weight converter above makes it easy to switch between stone, pounds, and kilograms whenever you need to.
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.
13.5 Stone to Pounds Conversion
13.5 stone = 189 lbs (or 189 pounds exactly).
To convert stone to pounds, multiply the stone value by 14. So: 13.5 × 14 = 189 lbs. This is the standard UK conversion used in NHS health guidance and weight management services.
For context, 189 lbs equals approximately 85.7 kg. At different heights, this weight gives different BMI values:
- At 5ft 6in (168cm): BMI = 30.7 (obese category)
- At 5ft 10in (178cm): BMI = 27.1 (overweight category)
- At 6ft (183cm): BMI = 25.7 (healthy weight category)
Use our BMI calculator above to find your exact BMI based on your height and weight.
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.
Understanding Your Weight in UK Health Context
Knowing your weight in both stone and pounds helps you engage with UK health information more effectively. NHS guidance, weight management services, and health professionals often use kilograms for clinical measurements, but many UK adults prefer stone and pounds for personal tracking.
If you're exploring weight management options, your weight is just one part of the picture. Your BMI, waist circumference, and overall health history all matter. If you're interested in weight loss support, including prescription options like GLP-1 medications, our weight loss calculator can help you understand potential outcomes. Always discuss any health concerns or weight management plans with your GP.
- 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 do I convert stone to pounds quickly?
Multiply the stone value by 14. For 13.5 stone: 13.5 × 14 = 189 pounds. Use our weight converter above for instant conversions between stone, pounds, and kilograms without a UK pharmacy calculation.
Is 13.5 stone a healthy weight?
It depends on your height. At 5ft 10in, 13.5 stone (189 lbs) gives a BMI of 27.1 (overweight). At 6ft, it's 25.7 (healthy). Check your personal BMI using our free calculator to see where you fall on NHS health guidelines.
What is 13.5 stone in kilograms?
13.5 stone equals approximately 85.7 kg. This is the metric equivalent used in NHS clinical records. Use our weight converter to switch between any units instantly.
How much weight would I lose on Wegovy or Mounjaro from this starting point?
Clinical trials showed average weight loss of 15–21% of body weight. From 189 lbs, that could range roughly 28–40 lbs over several months. Individual results vary significantly. Try our GLP-1 weight loss calculator to see projected outcomes at different doses.
Where can I find NHS guidance about healthy weight?
The NHS recommends a healthy BMI of 18.5–24.9 for most adults. Your GP can discuss what a healthy weight range means for you personally based on your health history and ethnicity, as some groups have different risk thresholds.
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.