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 BMI is 13.7 Stone in Pounds?
13.7 stone converts to 191.8 pounds (87.2 kg). Your BMI at this weight depends entirely on your height — the same weight can be healthy for one person and overweight for another. Using our free BMI calculator, you can instantly see what your personal BMI is. Below, we've calculated what BMI this weight gives at six different heights, along with the NHS category each one falls into. This helps you understand whether you're in a healthy weight range or if your GP might suggest lifestyle changes.
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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.
13.7 Stone BMI at Different Heights
13.7 stone (191.8 lbs or 87.2 kg) produces very different BMI values depending on your height. Here's what this weight means across common UK heights:
- At 5ft 2in (157cm): BMI 33.5 — Obese (Class I) category
- At 5ft 6in (168cm): BMI 30.9 — Obese (Class I) category
- At 5ft 10in (178cm): BMI 27.5 — Overweight category
- At 6ft (183cm): BMI 25.4 — Healthy weight category
- At 6ft 2in (188cm): BMI 24.6 — Healthy weight category
If you want to convert this weight to kilograms or check your exact height-to-weight ratio, use our free weight converter above. Remember, BMI is a useful screening tool but doesn't account for muscle mass, bone density, or where fat is stored on your body.
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.
NHS BMI Categories and What They Mean
According to NHS guidelines, a healthy BMI for most UK adults is between 18.5 and 24.9. At 13.7 stone, whether you're in a healthy range depends on your height. People of South Asian, Chinese, Black African, or Black Caribbean heritage have lower NHS thresholds — a healthy BMI for these groups starts at 18.5 and goes up to 22.9. Your GP can provide personalised advice about what your weight means for your individual health, especially if you have weight-related conditions like high blood pressure or type 2 diabetes.
- 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 13.7 stone to kilograms?
13.7 stone equals 87.2 kg. To convert any weight from stone to kg, multiply the stone value by 6.35029. You can use our free weight converter above to switch instantly between stone, pounds, and kilograms.
Is 13.7 stone a healthy weight for me?
It depends on your height and ethnicity. Use our free BMI calculator above to find out your personal BMI — it will tell you immediately whether 13.7 stone falls into a healthy range for you. Your GP can also advise based on your overall health.
What's the healthy weight range at my height?
The healthy BMI range (18.5–24.9) translates to different stone weights depending on height. At 5ft 8in, healthy weight is roughly 8st 7lbs to 11st 7lbs. For your specific height, use our BMI calculator to see the exact healthy range.
Does 13.7 stone mean I need to lose weight?
Not necessarily — it depends on your height and overall health. Some people at 13.7 stone may be in a healthy range, whilst others may benefit from lifestyle changes. Your GP can advise based on your BMI, waist circumference, and any weight-related health conditions.
Why does height matter so much for BMI?
BMI divides weight by height squared, so a small difference in height creates a significant difference in BMI. The same weight looks very different on a shorter person than a taller person — that's why height is crucial for understanding whether your weight is healthy.
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.