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 8.6 kg in Stone?
8.6 kilograms is equal to 1 stone and 5.6 pounds (1st 5.6lbs). To convert kilograms to stone, you divide the weight by 6.35029. This conversion is useful for UK health contexts, as adults in the UK typically use stone and pounds for body weight measurements, whilst medical professionals often work in kilograms. Use our free weight converter above to instantly switch between kg, stone, and pounds, or calculate your BMI at different heights to understand your health context at this weight.
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.
8.6 kg to Stone Conversion Reference
8.6 kg = 1 stone 5.6 lbs (approximately)
The kilogram to stone conversion uses this exact formula: weight in kg ÷ 6.35029 = weight in stone. For 8.6 kg: 8.6 ÷ 6.35029 = 1.356 stone.
Here are nearby weight conversions to give you context:
- 8.0 kg = 1st 3.8lbs
- 8.3 kg = 1st 4.8lbs
- 8.6 kg = 1st 5.6lbs
- 8.9 kg = 1st 6.4lbs
- 9.2 kg = 1st 7.4lbs
Whether you're tracking weight in stone and pounds or converting between metric and imperial measurements, understanding this relationship helps you communicate your weight clearly with healthcare providers and use UK weight management resources effectively.
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.
8.6 kg BMI and Healthy Weight Context
At 8.6 kg, understanding your BMI requires knowing your height. For example, at an average UK female height of 163cm (5ft 4in), 8.6 kg would indicate severe underweight (BMI 3.2), which is not a typical body weight for adults. However, 8.6 kg may be relevant if you're tracking infant or child weight, where different growth charts apply.
For context on healthy adult weight ranges, use our free BMI calculator above to enter your actual height and current weight. The NHS recommends a healthy BMI between 18.5 and 24.9 for most adults. If you're concerned about weight or health, your GP can provide personalised guidance based on your individual circumstances and medical history.
- 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 8.6 kg to stone and pounds?
Divide 8.6 by 6.35029 to get stone. 8.6 ÷ 6.35029 = 1.356 stone, which equals 1 stone and 5.6 pounds. You can also use our free weight converter on this page for gradual improvement in both imperial and metric units.
Is 8.6 kg a healthy weight for an adult?
8.6 kg is well below a healthy adult weight range. At any height, this would indicate severe underweight. Healthy adult weights typically range from around 50–100 kg depending on height. If you have concerns about weight, consult your GP for personalised advice.
What's the formula for converting kilograms to stone?
The formula is: weight in kg ÷ 6.35029 = weight in stone. Alternatively, multiply kilograms by 0.157473 to convert directly to stone. To convert back, multiply stone by 6.35029.
Why do UK adults use stone instead of kilograms?
UK tradition and habit are the main reasons. The metric system (kilograms) is used in medical and clinical settings across the NHS, but many UK adults prefer stone and pounds for personal weight discussions. Both units are widely accepted in UK health contexts.
How does 8.6 kg compare to average UK body weight?
The average UK adult weighs around 70–85 kg. At 8.6 kg, this is significantly lower, typically indicating infant weight or a health concern requiring medical assessment. Use our BMI calculator to check healthy weight ranges for your specific height.
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.