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
13.5 Stone in Pounds — Quick Conversion
13.5 stone equals exactly 189 pounds. In kilograms, this is approximately 85.2 kg. Whether you're tracking your weight for health reasons or simply need a quick conversion between UK measurements, understanding how stone, pounds, and kilograms relate to each other is useful for NHS health guidance. Use our free weight converter above to switch between metric and imperial measurements instantly, and our BMI calculator to see where your weight sits on the healthy weight scale according to NHS guidelines.
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.
Stone to Pounds Conversion Explained
13.5 stone = 189 pounds exactly. This conversion uses the standard UK measurement where 1 stone = 14 pounds. To calculate it yourself: 13.5 × 14 = 189 lbs.
In metric terms, 189 pounds is approximately 85.2 kg. This weight sits in the overweight to obese range for most UK adults, depending on height and age. For example:
- At 5ft 6in (168cm), a weight of 189 lbs gives a BMI of approximately 30.6 (obese category)
- At 5ft 10in (178cm), the BMI would be approximately 27.1 (overweight category)
- At 6ft (183cm), the BMI would be approximately 25.6 (healthy weight range)
Use our free BMI calculator above to find your exact BMI based on your height and current weight. Remember that BMI is a screening tool and does not account for muscle mass, bone density, or where fat is stored on the body.
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.
UK Health Guidance at This Weight
If your weight is 189 lbs (13.5 stone / 85.2 kg), NHS guidance suggests considering a chat with your GP if you fall into the overweight or obese range for your height. Even a modest 5% weight reduction — around 9.5 lbs in your case — can bring meaningful health benefits including better blood sugar control, reduced blood pressure, and improved mobility.
Weight management options in the UK include lifestyle changes (diet and activity), NHS-supported programmes through your GP, and prescription-only weight loss medications available through specialist services or private prescribing. Track your progress over time using our free progress tracker, and remember that sustainable weight loss typically occurs at a rate of 0.5–1 kg per week alongside a reduced-calorie diet and increased physical activity.
- 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 13.5 stone?
13.5 stone equals exactly 189 pounds. The conversion is simple: multiply stone by 14 (since 1 stone = 14 pounds). So 13.5 × 14 = 189 lbs. You can use our free weight converter above to check conversions between stone, pounds, and kilograms instantly.
What is 189 pounds in kilograms?
189 pounds is approximately 85.2 kg. To convert pounds to kilograms yourself, divide by 2.20462. This weight falls into the overweight to obese range for most UK adults, though it depends on your height — use our BMI calculator to find your personal BMI.
Is 13.5 stone a healthy weight?
Whether 189 lbs (13.5 stone) is healthy depends on your height, age, and body composition. For most UK adults, this weight puts you in the overweight or obese BMI category. Your GP can advise on whether this weight increases health risks for you personally and discuss weight management options if needed.
What can I do if I weigh 189 pounds?
If you're looking to manage your weight, start by discussing your health goals with your GP. You might explore lifestyle changes (reduced-calorie diet and increased activity), NHS weight management programmes, or prescription weight loss options available through NHS specialist services. Track progress with our free progress tracker.
How much weight would I need to lose to reach a healthy BMI?
The amount depends on your height. For example, at 5ft 6in, you'd need to reach approximately 163 lbs (11.6 stone / 74 kg) for a healthy BMI of 24.9. Use our free BMI calculator above to find your target healthy weight range based on your height, then discuss realistic, sustainable goals with your GP.
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.