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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Is 85.6 kg a Healthy Weight? Stone Conversion & Health Guide
85.6 kilograms converts to 13 stone 6.4 pounds (13st 6.4lbs). Whether this weight is healthy depends entirely on your height, age, and body composition. Using NHS guidelines, we'll help you understand if 85.6kg falls within a healthy range for you, and what to do if it doesn't. Our free BMI calculator above will give you an instant personalised result based on your height.
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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.
Healthy Weight Ranges at Different Heights
To convert kilograms to stone accurately, divide your weight by 6.35. At 85.6kg, this equals approximately 13 stone 6 pounds.
Whether this weight is healthy depends on your height. Here are three practical examples using NHS guidelines:
- At 160cm (5ft 3in): 85.6kg gives a BMI of 33.4 (obese range) — healthy weight would be 47–63kg (7st 6lbs to 9st 13lbs)
- At 175cm (5ft 9in): 85.6kg gives a BMI of 27.9 (overweight range) — healthy weight would be 56–76kg (8st 12lbs to 12st 0lbs)
- At 185cm (6ft 1in): 85.6kg gives a BMI of 25.0 (healthy range) — healthy weight would be 63–98kg (9st 13lbs to 15st 5lbs)
Use the BMI calculator on this page to find your personal result 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.
NHS Guidance: What to Do if You're Outside the Healthy Range
According to NHS guidelines, a healthy BMI for most adults is between 18.5 and 24.9. If your BMI falls above 25, your GP may discuss lifestyle changes including a balanced diet and increased physical activity. For South Asian, Chinese, Black African, or Black Caribbean adults, NHS recommends slightly lower thresholds due to higher health risks at lower BMI levels.
Waist measurement also matters: Men with a waist over 102cm (40in) and women over 88cm (34.5in) face increased health risks regardless of BMI. Track your progress using our free progress tracker, and always speak to your GP for personalised advice about what weight is right for you.
- 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 85.6kg to stone and pounds?
Divide 85.6 by 6.35 to get stone (13.5 stone). To express the decimal as pounds, multiply the remainder by 14. This gives 13 stone 6.4 pounds exactly. Use our weight converter above for instant conversions between kg, stone, and pounds.
Is 85.6kg overweight or obese?
It depends on your height. At 160cm it's obese (BMI 33.4), at 175cm it's overweight (BMI 27.9), and at 185cm it's healthy (BMI 25.0). Calculate your personal BMI above to see where you fall on the NHS scale.
What's the healthy weight range for my height?
Healthy weight depends on height. Generally, healthy BMI is 18.5–24.9. At 175cm, healthy weight is roughly 56–76kg. At 185cm, it's roughly 63–98kg. Your GP can discuss what's realistic and healthy for your individual circumstances.
What should I do if my weight is outside the healthy range?
Start by speaking to your GP, who can assess your overall health and discuss options. The NHS recommends gradual weight loss of 0.5–1kg per week through balanced diet and activity. Sustainable changes work better than rapid loss. Your GP can refer you to weight management services if needed.
Does waist measurement matter as much as weight?
Yes. Even if your BMI is healthy, excess weight around the abdomen increases health risks. NHS recommends checking waist circumference: men over 102cm and women over 88cm face increased risk. Waist-to-height ratio below 0.5 is considered healthy for all adults.
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.