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
Is 85 Kilos a Healthy Weight?
85 kilos converts to 13 stone 5 pounds (13st 5lbs), but whether this is healthy depends entirely on your height. For someone who is 5ft 8in (173cm), a weight of 85kg gives a BMI of 30.1, which falls into the obese category. However, at 6ft 2in (188cm), the same weight results in a BMI of 24.4, which is in the healthy range. The NHS provides clear BMI guidance to help you understand what your weight means for your health. Use our free BMI calculator above to check your personal BMI instantly based on your exact height and 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.
Healthy Weight Ranges by Height
To determine if 85kg is healthy for you, compare your height to these healthy weight ranges for UK adults. These are based on NHS BMI guidelines (18.5 to 24.9):
- 5ft 4in (163cm): Healthy range is 49–65kg (7st 10lbs – 10st 3lbs). At 85kg, you would be overweight.
- 5ft 8in (173cm): Healthy range is 55–75kg (8st 8lbs – 11st 10lbs). At 85kg, you would be in the obese range.
- 6ft 0in (183cm): Healthy range is 62–85kg (9st 9lbs – 13st 5lbs). At 85kg, you would be at the upper edge of healthy.
- 6ft 3in (190cm): Healthy range is 66–92kg (10st 5lbs – 14st 5lbs). At 85kg, you would be comfortably in the healthy range.
These ranges show how significantly height affects whether a weight is healthy. Use the weight converter on this page to check your current weight in metric to imperial units.
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.
Understanding Your BMI and Next Steps
BMI is a screening tool used by the NHS to assess health risk, but it has limitations — it doesn't distinguish between muscle and fat. Your waist measurement also matters. The NHS recommends: men over 94cm (37in) have increased health risk; women over 80cm (31.5in) have increased risk. If your weight is outside the healthy range for your height, don't worry. Small changes can make a real difference. The NHS recommends losing 0.5–1kg per week through a combination of balanced eating and increased physical activity. Your GP can provide personalised advice and support, or you can explore structured weight loss programmes in your local area.
- 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 kilos in stones and pounds?
85kg converts to exactly 13 stone 5 pounds (13st 5lbs). To calculate this: 85kg ÷ 6.35029 = 13.4 stone, which is 13 stone plus 0.4 × 14 pounds = 13st 5.6lbs. This is the standard conversion used in UK health contexts.
Is 85kg overweight or obese according to NHS guidelines?
It depends on your height. At 5ft 8in (173cm), 85kg gives a BMI of 30.1 (obese). At 6ft 2in (188cm), it gives a BMI of 24.4 (healthy). Use our BMI calculator on this page to find your personal BMI based on your exact height and weight.
What's a healthy weight for someone who weighs 85kg?
If you currently weigh 85kg and are outside the healthy BMI range for your height, the NHS recommends aiming to lose 5–10% of your body weight initially. For 85kg, this means losing 4–8.5kg. This modest loss can significantly improve health markers like blood pressure and blood sugar levels.
How do I know if my weight is healthy besides BMI?
BMI is just one indicator. The NHS also recommends measuring your waist circumference. Men with a waist over 94cm (37in) and women over 80cm (31.5in) have increased health risk, even if their BMI is in the healthy range. Your GP can provide a full health assessment.
What should I do if I need to lose weight from 85kg?
Start with your GP for personalised advice. The NHS recommends losing 0.5–1kg per week through balanced eating and 150 minutes of activity per week. You can track your progress using our free progress tracker. For some people, structured programmes or weight loss support may be recommended.
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.