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's 16.6 Stone In Kilograms?
16.6 stone equals approximately 105.4 kg — a weight that falls into different NHS BMI categories depending on your height. Whether you're checking your current weight or tracking progress, understanding what this weight means for your health is important. BMI (body mass index) is a useful screening tool that combines weight and height to give health context. Use our free BMI calculator above to check your personal BMI, or explore the examples below to see how 105.4 kg converts to different BMI ranges across typical adult heights.
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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.
BMI at 16.6 Stone (105.4 kg) — Examples by Height
At 16.6 stone (105.4 kg), your BMI depends entirely on your height. Here's how this weight converts to BMI across common UK adult heights:
- 5ft 2in (157 cm): BMI 42.9 — Severely obese (Class III) according to NHS guidelines
- 5ft 5in (165 cm): BMI 38.5 — Obese (Class II)
- 5ft 8in (173 cm): BMI 35.2 — Obese (Class II)
- 5ft 10in (178 cm): BMI 33.0 — Obese (Class I)
- 6ft 0in (183 cm): BMI 31.1 — Obese (Class I)
- 6ft 2in (188 cm): BMI 29.7 — Overweight
To convert kilograms to stone, simply divide 105.4 by 6.35 — or use our free weight converter above to switch between metric and imperial units instantly.
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.
Understanding NHS BMI Categories
The NHS classifies BMI ranges to help identify health risk from excess weight. At 16.6 stone, most heights fall into the obese category, which means your GP may recommend lifestyle changes or screening for weight-related conditions like type 2 diabetes, high blood pressure, or sleep apnoea.
Important: BMI has limitations — it doesn't distinguish between muscle and fat, so athletes may have high BMI with low body fat. Your GP can provide personalised health advice based on your individual circumstances, including waist measurement and medical history, which are also important indicators of health risk.
- 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.
What is 16.6 stone in kilograms exactly?
16.6 stone equals 105.4 kg. To convert stone to kg, multiply the stone value by 6.35029. This conversion is consistent across the UK where stone and pounds remain common for body weight measurement, while medical professionals often use kilograms.
Is 16.6 stone (105.4 kg) a healthy weight?
At 16.6 stone, a healthy weight depends on your height. At most typical adult heights, this weight falls into the obese category according to NHS guidelines. Your GP can advise whether weight loss would benefit your health and discuss appropriate options.
What's the healthy weight range for my height at 16.6 stone?
Use our free BMI calculator above to find your exact healthy weight range based on your height. Generally, a healthy BMI is 18.5 to 24.9 — for 5ft 8in, that's roughly 55 to 74 kg. Your GP can also advise on realistic targets for you.
Can I lose weight from 16.6 stone (105.4 kg) safely?
Yes. The NHS recommends losing weight at 0.5 to 1 kg per week for sustainable results. This typically requires a calorie deficit of around 500 kcal daily, alongside increased physical activity. Your GP can provide personalised guidance on safe weight loss for your circumstances.
Does BMI tell the whole story about health at 16.6 stone?
No. BMI doesn't account for muscle mass, waist circumference, or medical history. Someone with significant muscle may have high BMI but low health risk. Waist measurement and conversations with your GP give a fuller health picture than BMI alone.
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.