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
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85.5 Kg to Stone — Instant Conversion
85.5 kilograms is equal to 13 stone and 6.5 pounds (13st 6.5lbs). If you're converting your weight between metric and imperial measurements, understanding this kg to stone conversion is useful for tracking your health in UK measurements. Whether you're checking your BMI, monitoring weight changes, or simply working with UK health records, converting kilograms to stone helps you understand your weight in the format most UK adults use. This guide covers the exact conversion, nearby values, and what this weight means for your health at different 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.
Conversion Formula and Nearby Values
To convert 85.5kg to stone, divide the kilogram value by 6.35029 (the standard conversion factor). The formula is: kg ÷ 6.35029 = stone. So 85.5 ÷ 6.35029 = 13.47 stone, which is 13 stone and 6.5 pounds.
Here's a table of nearby kilogram weights converted to stone and pounds for quick reference:
- 80 kg = 12st 8lbs
- 82 kg = 12st 13.6lbs
- 84 kg = 13st 3.2lbs
- 85.5 kg = 13st 6.5lbs
- 87 kg = 13st 10lbs
- 89 kg = 14st 0lbs
- 90 kg = 14st 3lbs
You can also use the reverse conversion: stone to kg by multiplying stone by 6.35029. This metric to imperial weight conversion is essential for UK health records, NHS appointments, and personal health tracking.
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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.
BMI and Healthy Weight at 85.5 Kg
At 85.5kg (13st 6.5lbs), your BMI depends on your height. For an average UK adult man (5ft 9in or 175cm), 85.5kg gives a BMI of approximately 27.9, which falls in the overweight range (BMI 25–29.9). For an average UK woman (5ft 3.5in or 161.6cm), the same weight results in a BMI of around 32.8, which is in the obese range (BMI 30+). Use our free BMI calculator above to check your personal BMI at this weight and your height. The healthy weight range at most UK heights is significantly lower, typically between 9–11 stone, depending on individual height and frame. If you're concerned about your weight or health, your GP can provide personalised guidance.
- 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 85.5kg in stone and pounds?
85.5kg equals 13 stone 6.5 pounds (13st 6.5lbs). To convert, divide 85.5 by 6.35029. You can use our free weight converter above to instantly switch between kg, stone, and pounds for any weight value.
Is 85.5kg a healthy weight?
It depends on your height and individual health factors. At 85.5kg, most UK adults fall in the overweight or obese BMI category. Our BMI calculator above shows your personal BMI based on your height. Your GP can advise whether this weight is healthy for you specifically.
How many pounds is 85.5kg?
85.5kg equals approximately 188.6 pounds (lbs). One kilogram equals 2.20462 pounds, so 85.5 × 2.20462 = 188.6lbs. Use our weight converter for instant conversions between kg and lbs.
What stone to kg conversion formula should I use?
To convert stone to kilograms, multiply the stone value by 6.35029. For example, 13 stone × 6.35029 = 82.55kg. The reverse formula (kg to stone) divides by 6.35029: 85.5 ÷ 6.35029 = 13.47 stone.
Can I track weight loss from 85.5kg using MyWeightCheck tools?
Yes. Use our free progress tracker to log your weight and monitor changes over time. Our BMI calculator and weight converter help you track health metrics in your preferred measurements (kg, stone, or pounds).
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.