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
16 and a Half Stone in Kg — Conversion and Health Context
16 and a half stone is equivalent to approximately 104.6 kilograms. This conversion uses the standard metric formula: one stone equals 6.35029 kg. Whether you're tracking your weight for health reasons, managing a weight loss journey, or simply need to switch between UK measurements and metric, understanding how your weight converts is a useful first step. Use our free weight converter above to instantly switch between stone, pounds, and kilograms — and check your personal BMI using our free BMI calculator on this page.
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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.
How to Convert 16.5 Stone to Kilograms
To convert 16 and a half stone to kg, multiply the stone value by 6.35029. The calculation is straightforward: 16.5 × 6.35029 = 104.6 kg. This conversion method works for any stone weight — simply divide any kilogram figure by 6.35029 to reverse the calculation. For practical purposes, 16.5 stone is commonly rounded to 104–105 kg in health contexts. Our free weight converter on this page lets you instantly convert between stone, pounds, and kilograms without a UK pharmacy calculation. This is especially useful if you're tracking weight changes or comparing your measurements against NHS health guidance, which often references both metric and imperial units depending on context.
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.
What Does 104.6 kg Mean for Your Health?
At 104.6 kg (16.5 stone), your health context depends on your height and age. According to NHS guidance, this weight falls into the overweight or obese category for most UK adults, though exact classification requires calculating your BMI. For example, at 5ft 8in (173 cm), a weight of 104.6 kg gives a BMI of approximately 37, which falls into the obese category. However, BMI does not account for muscle mass, bone density, or where fat is stored — your GP can provide personalised health advice. Our BMI calculator on this page shows your precise category instantly. If you're considering weight management, even a 5–10% reduction in body weight can bring meaningful health benefits, and your GP can discuss suitable options including lifestyle changes or, where appropriate, prescription treatments.
- 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 104.6 kg overweight according to NHS guidelines?
It depends on your height. For most UK adults, 104.6 kg falls into the overweight or obese BMI category. Use our free BMI calculator on this page to check your personal BMI. Your GP can also assess your health risk based on waist measurement, fitness level, and medical history — BMI is a screening tool, not a complete health picture.
How do I convert stone to kg without a calculator?
Multiply the stone value by 6.35029. So 16.5 stone × 6.35029 = 104.6 kg. For quick mental maths, remember that one stone is roughly 6.35 kg. Use our free weight converter above for instant conversions without a UK pharmacy calculation.
What's the healthy weight range for my height at this weight?
Healthy weight range depends on your height and ethnicity. For example, at 5ft 8in, a healthy weight is typically 55–74 kg. At 104.6 kg, most adults would benefit from gradual, sustainable weight loss. Our BMI calculator shows your personal healthy weight range instantly — enter your height to see your recommended range.
Can I lose weight from 104.6 kg safely?
Yes. The NHS recommends losing 0.5–1 kg per week through a combination of reduced-calorie diet and increased physical activity. Your GP can provide personalised guidance. For some people, prescription weight management treatments may be appropriate — your GP can assess whether this suits your individual circumstances.
Is there a difference between 16.5 stone and 104.6 kg for health purposes?
No — they're exactly the same weight, just in different units. NHS health thresholds use both metric (kg) and imperial (stone) measurements. Your BMI, health risk, and treatment options are the same regardless of which unit you use. Use whichever feels most natural to you.
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.