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
15 Stone 9 in Pounds — Convert to kg and Check Your Health
15 stone 9 pounds is equivalent to 99.8 kilograms (or 220 pounds). If you're converting your weight for health reasons, understanding how this weight relates to your personal health is important. Using our free weight converter on this page, you can instantly switch between UK measurements (stone and pounds) and metric units (kg). If you'd like to see how this weight affects your health according to NHS guidance, try our free BMI calculator to discover your personal BMI and where it falls on the UK health scale.
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.
What Does 15 Stone 9 Mean for UK Health Guidance?
According to NHS guidelines, a healthy BMI for most UK adults falls between 18.5 and 24.9. At 15 stone 9 pounds (99.8 kg), whether this weight is considered healthy depends on your height — this is why BMI calculations matter. For example, at an average UK adult height of 5ft 8in (173cm), a weight of 15 stone 9 would result in a BMI of approximately 30.7, which falls into the obese category (Class I) according to NHS classifications.
It's important to remember that BMI has limitations — it doesn't distinguish between muscle and fat, and doesn't account for where fat is stored. Your GP can provide personalised health advice about what your weight means for your individual circumstances.
- Use our BMI calculator above to check your personal BMI at this weight
- Factor in your age, fitness level, and any health conditions
- Consider your waist circumference as well — the NHS also recommends measuring this
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.
Managing Your Weight — UK Resources and Support
If you're concerned about your weight, the NHS offers free weight management support through your GP. Depending on where you live in the UK, you may be eligible for structured weight loss programmes, dietary advice, or specialist tier 3 weight management services.
For sustainable weight loss, the NHS recommends losing no more than 0.5 to 1 kg per week. This typically requires a calorie deficit of around 500 kcal per day, achieved through a combination of dietary changes and increased physical activity. If you're tracking your progress, our free progress tracker can help you log weight changes over time and stay motivated.
- Contact your GP to discuss your weight and health goals
- Ask about NHS weight management programmes available in your area
- Consider speaking with a dietitian for personalised nutrition guidance
- 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 15 stone 9 to kilograms?
15 stone 9 pounds equals approximately 99.8 kg. To calculate: 15 stone (95.25 kg) plus 9 pounds (4.08 kg) = 99.33 kg. Use our free weight converter above for instant conversions between stone, pounds, and kilograms.
Is 15 stone 9 a healthy weight?
Whether 15 stone 9 is healthy depends on your height, age, and overall health. Use our free BMI calculator on this page to check your personal BMI. At an average UK height of 5ft 8in, this weight results in a BMI of approximately 30.7 (obese category). Your GP can give personalised advice.
What weight loss rate should I aim for?
The NHS recommends losing 0.5 to 1 kg (1–2 lbs) per week for sustainable results. This typically requires a calorie deficit of around 500 kcal per day through diet and physical activity combined. gradual weight management can lead to muscle loss, so steady progress is preferable.
Can I access weight loss support through the NHS?
Yes. Contact your GP to discuss weight management options. The NHS offers free support including weight loss programmes, dietary advice, and in some areas, specialist tier 3 weight management services. Availability varies by region (ICB).
What does BMI tell me about my health?
BMI is a useful screening tool that indicates whether your weight falls into a healthy range for your height according to NHS guidelines. However, BMI has limitations — it doesn't account for muscle mass or fat distribution. Combined with waist measurement and GP advice, it gives a fuller health picture.
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.