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 80.5kg a Healthy Weight in Stone?
80.5 kilograms is equivalent to 12 stone 8 pounds. Whether this weight is healthy depends entirely on your height — the same weight can be perfectly healthy for one person and overweight for another. The NHS uses BMI (body mass index) to assess if a weight is in a healthy range. Use our free BMI calculator above to check your personal BMI instantly, or read on to see how 80.5kg compares across 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.
Healthy Weight Ranges at Different Heights
At 80.5kg (12 stone 8lbs), whether your weight falls in a healthy range depends on your height. Here are three real examples:
- If you're 5ft 4in (163cm): 80.5kg gives a BMI of 30.4 — this falls into the obese category. Your healthy weight range would be approximately 48–64kg (7st 8lbs–10st 1lbs).
- If you're 5ft 9in (175cm): 80.5kg gives a BMI of 26.2 — this falls into the overweight category. Your healthy weight range would be approximately 57–75kg (8st 13lbs–11st 11lbs).
- If you're 6ft 0in (183cm): 80.5kg gives a BMI of 24.0 — this falls into the healthy weight category. Your healthy weight range would be approximately 61–82kg (9st 9lbs–12st 13lbs).
Use the weight converter on this page to find your exact weight in stone, then calculate your BMI to see where you stand.
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.
What the NHS Recommends
The NHS recommends a BMI between 18.5 and 24.9 as a healthy range for most UK adults. If your BMI is 25–29.9, you're classified as overweight; 30 or above is obese. However, BMI is just one tool — waist measurement also matters. For men, a waist over 94cm (37 inches) indicates increased health risk; over 102cm (40 inches) is high risk. For women, risk increases above 80cm (31.5 inches) and becomes high above 88cm (34.5 inches). If you're concerned about your weight or health, talk to your GP who can give personalised advice based on your full health picture, not just a number on the scales.
- 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 80.5kg in stone and pounds?
80.5kg converts to 12 stone 8 pounds (or 12st 8lbs). To convert kg to stone yourself, divide the kilograms by 6.35029. One stone equals 6.35kg, and one stone equals 14 pounds exactly.
Is 80.5kg overweight for someone 5ft 8in tall?
At 5ft 8in (173cm), 80.5kg gives a BMI of approximately 26.9, which falls into the overweight category (25–29.9). A healthy weight range at this height would be roughly 57–76kg (8st 13lbs–11st 13lbs). Your GP can advise on whether weight loss would benefit your health.
Can BMI alone tell me if my weight is healthy?
BMI is a useful screening tool but has limitations. It doesn't distinguish between muscle and fat, so athletes may have a high BMI despite low body fat. Waist circumference is equally important — excess weight carried around the middle carries greater health risk. For a complete picture, consult your GP.
What's the best way to reach a healthy weight?
The NHS recommends losing weight at 0.5–1kg per week through sustainable changes: a balanced diet with a calorie deficit, increased physical activity, and behaviour change. Track your progress using our free progress tracker to stay motivated. Your GP can refer you to local weight management support if needed.
How do I know my healthy weight range?
Your healthy weight range depends on your height, age, sex, and muscle mass. Calculate your BMI using our free BMI calculator on this page — it will show your healthy weight range immediately. South Asian, Chinese, Black African, and Black Caribbean adults should use lower BMI thresholds (ask your GP for guidance specific to your heritage).
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.