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 Is 105 Stones in Kilograms?
105 stones converts to approximately 666.8 kilograms (kg). This weight falls into the severely obese category according to NHS guidelines. If you weigh 105 stone, understanding your weight in both metric and imperial units, along with your BMI, can help you make informed health decisions. Our free weight converter above instantly switches between stone, pounds, and kilograms, whilst our BMI calculator helps you understand what your weight means for your health in the UK context.
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.
UK Health Context for 105 Stone Weight
A weight of 105 stone (666.8 kg) is significantly above the NHS healthy weight range for most UK adults. According to NHS guidelines, a healthy BMI sits between 18.5 and 24.9, with overweight starting at BMI 25 and obesity at BMI 30. At 105 stone, most adults would have a BMI well above 40, which falls into the severely obese category requiring medical attention. The NHS recognises that reaching and maintaining a healthy weight is challenging and recommends a structured, multidisciplinary approach through specialist weight management services. If you're at this weight, your GP can refer you to tier 3 or tier 4 specialist services, which may include dietary support, behaviour change programmes, and in some cases, prescription weight management medication or bariatric surgery assessment.
- NHS healthy weight range: BMI 18.5–24.9
- Overweight: BMI 25–29.9
- Obese: BMI 30–39.9
- Severely obese: BMI 40+
- Specialist services available through NHS referral from your GP
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.
Tools and Resources to Support Your Health
Managing weight at 105 stone requires professional support and a tailored approach. The NHS offers free tier 1 weight management resources, including digital tools and community programmes accessible to all UK adults. Our free BMI calculator on this page shows your exact BMI status and healthy weight range for your height. If you're interested in exploring prescription weight management options, our GLP-1 weight loss calculator can help estimate potential outcomes with medically supervised treatment. Most importantly, speaking with your GP is the essential first step—they can assess your individual health, discuss available options (including lifestyle support, medications, or specialist referral), and provide personalised nhs health advice tailored to your circumstances.
- 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 105 stone to kilograms?
Multiply 105 by 6.35029. The calculation is 105 × 6.35029 = 666.78 kg. You can use our free weight converter above for instant conversions between stone, pounds, and kilograms whenever you need them.
What is my BMI if I weigh 105 stone?
Your BMI depends on your height. At 105 stone (666.8 kg), most adults would have a BMI well above 40, which is the severely obese category. Use our free BMI calculator above to calculate your exact BMI by entering your height and weight.
Is 105 stone considered obese by NHS standards?
Yes. According to NHS guidelines, a BMI of 40 or above is classified as severely obese. At 105 stone, you would almost certainly fall into this category and would benefit from speaking with your GP about specialist weight management support.
What weight loss support is available on the NHS?
The NHS offers a four-tier pathway: tier 1 (digital tools and community programmes), tier 2 (primary care support), tier 3 (specialist multidisciplinary services with possible medication), and tier 4 (bariatric surgery assessment). Your GP can refer you to specialist services appropriate for your needs.
Can prescription weight loss medications help at 105 stone?
Prescription weight management medications like Mounjaro and Wegovy may be considered as part of a comprehensive approach alongside diet, exercise, and behavioural support. However, at this weight, your GP or specialist will assess whether medication, lifestyle changes, or other options are most appropriate for 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.