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
15.6 Stone in Kilograms — Quick Conversion
15.6 stone is equal to approximately 99.1 kg. This conversion uses the standard UK stone to kilogram formula, where 1 stone equals 6.35029 kilograms. Whether you're tracking your weight for health reasons, medical appointments, or comparing your measurements against NHS guidelines, understanding your weight in both stone and kilograms is useful. You can use our free weight converter above to switch between units instantly, or calculate your personal BMI using the BMI calculator on this page.
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.
Conversion Formula and Reference Table
To convert 15.6 stone to kilograms, multiply by 6.35029. The formula is: stone × 6.35029 = kg. So 15.6 × 6.35029 = 99.1 kg. This standard kilogram to stone conversion applies across the UK. Here's a reference table showing nearby values:
- 15.0 stone = 95.3 kg
- 15.2 stone = 96.6 kg
- 15.4 stone = 97.8 kg
- 15.6 stone = 99.1 kg
- 15.8 stone = 100.3 kg
- 16.0 stone = 101.6 kg
- 16.2 stone = 102.8 kg
If you're converting kilos in stone, use the opposite calculation: divide kilograms by 6.35029 to get stone. Our weight converter makes this instant — no maths needed.
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.
BMI Context at 15.6 Stone
At 15.6 stone (99.1 kg), your BMI depends on your height. For example, at an average UK male height of 5ft 9in (175 cm), a weight of 99.1 kg gives a BMI of 32.2, which falls in the obese (Class I) range according to NHS guidelines. At an average UK female height of 5ft 3.5in (161 cm), the same weight gives a BMI of 38.1, which is severely obese (Class III). Use our free BMI calculator above to find your personal BMI and health category based on your actual height. BMI provides useful screening information, though it doesn't account for muscle mass or where fat is stored.
- 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.
Is 15.6 stone considered overweight in the UK?
Yes, 15.6 stone (99.1 kg) is typically in the overweight to obese range according to NHS guidelines, depending on your height. At most adult heights, this weight falls into the obese category (BMI 30+). Your GP can advise whether this weight poses health risks for you personally, considering your age, health conditions, and fitness level.
How do I convert 15.6 stone to pounds?
15.6 stone equals 218.4 pounds (lbs). Since 1 stone = 14 pounds, multiply 15.6 × 14 = 218.4 lbs. Alternatively, convert stone to kg first (99.1 kg), then multiply by 2.20462 to get pounds. Our weight converter handles this instantly for you.
What's the healthy weight range at my height if I weigh 15.6 stone?
Your healthy weight range depends on your height. Use our free BMI calculator above — enter your height and current weight to see where you fall. A healthy BMI is 18.5–24.9 according to NHS standards. Your calculator will show your target weight range to reach a healthy BMI at your specific height.
Is 99.1 kg a safe weight for an adult?
Safety depends on your height, age, fitness level, and medical history. At 15.6 stone (99.1 kg), most adults are above the NHS healthy weight range. However, only your GP can assess whether weight loss would benefit your personal health. They can advise based on your overall health picture and any weight-related conditions you may have.
Can I use MyWeightCheck tools to track weight loss from 15.6 stone?
Yes. Use our free progress tracker to log your weight over time and monitor your progress. Our GLP-1 weight loss calculator can help estimate potential weight loss if you're considering prescription weight loss options. Our BMI calculator will show you how your BMI improves as you progress — all available free on this page.
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.