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 13.5 Stone in Pounds?
13.5 stone converts to 189 pounds — a straightforward calculation using the standard UK to imperial conversion. In kilogrammes, this equals approximately 85.7 kg. Understanding your weight in different measurements is useful for health tracking, whether you're using NHS guidance, checking your BMI, or following a weight management programme. Many UK adults use stone and pounds for everyday weight discussions, while healthcare professionals often reference kilogrammes. This UK health guide helps you understand what 13.5 stone means for your health and provides context using NHS weight standards.
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 and UK Health Context
At 13.5 stone (189 lbs / 85.7 kg), your weight falls into the overweight category according to NHS guidelines for most adults. However, your health status depends on your height, age, and other factors — not weight alone.
- If you're 5ft 8in (173cm): A BMI of around 27–28, which is overweight but not obese
- If you're 5ft 10in (178cm): A BMI of approximately 26–27, still in the overweight range
- If you're 6ft (183cm): A BMI of around 25–26, approaching the healthy weight range
NHS guidance suggests a healthy weight range for most adults is a BMI between 18.5 and 24.9. Use our free BMI calculator above to check your exact BMI based on your height, which gives you a clearer picture of your personal health status.
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.
Weight Management and Next Steps
If you're at 13.5 stone and concerned about your health, the NHS recommends starting with sustainable lifestyle changes: a balanced diet with a modest calorie deficit and regular physical activity. Losing just 5–10% of body weight (approximately 7–14 lbs) can improve blood pressure, blood sugar control, and cardiovascular health.
Your GP can provide personalised advice about whether your weight is a health concern for you individually. They can also discuss weight management options, from dietary support to structured programmes. If you're tracking progress, our free progress tracker helps you monitor weight changes over time alongside lifestyle adjustments.
- 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 13.5 stone to pounds?
Multiply stone by 14 — the exact conversion factor. 13.5 × 14 = 189 pounds. Use our free weight converter above for instant conversions between stone, pounds, and kilogrammes across all weights.
Is 13.5 stone overweight according to NHS guidelines?
It depends on your height. 13.5 stone (85.7 kg) is typically in the overweight range for average-height adults, but your BMI determines your actual category. Calculate your BMI using the calculator on this page for your personal health picture.
What's the kilogramme equivalent of 13.5 stone?
13.5 stone equals approximately 85.7 kg. This is the metric measurement used by healthcare professionals and the NHS. Both measurements are equally valid — UK adults often use stone and pounds for personal tracking.
Is losing weight necessary if I'm 13.5 stone?
Weight loss isn't necessary for everyone at this weight. Your overall health depends on fitness level, diet quality, blood pressure, and family history — not weight alone. Talk to your GP about what's appropriate for your individual circumstances.
How quickly should I expect to lose weight healthily?
The NHS recommends losing no more than 0.5–1 kg (1–2 lbs) per week for sustainable results. This typically requires a calorie deficit of 500 kcal daily alongside increased physical activity. Faster weight loss risks muscle loss and is harder to maintain long-term.
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.