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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80.4kg in Stone — Quick Conversion
80.4kg is equivalent to 12 stone 8.4 pounds (or 12st 8.4lbs) in UK measurements. If you're converting kilograms to stone using the standard kilogram to stone conversion, this weight falls into the overweight category according to NHS guidelines for most adults. Understanding your weight in stone is useful for tracking health progress and comparing to UK health thresholds. Use our free weight converter above to check conversions between kg, stone, and pounds instantly.
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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 Table and Formula
To convert 80.4kg to stone, divide by 6.35029. The calculation is: 80.4 ÷ 6.35029 = 12.66 stone, which breaks down as 12 stone and 8.4 pounds.
Here's a quick reference table showing nearby weight conversions in kg, stone, and pounds:
- 78kg = 12st 3.4lbs
- 79kg = 12st 5.2lbs
- 80kg = 12st 7.1lbs
- 80.4kg = 12st 8.4lbs
- 81kg = 12st 9.1lbs
- 82kg = 12st 10.9lbs
- 83kg = 13st 0.7lbs
This conversion uses the internationally recognised 1 stone = 6.35029kg ratio. Many UK health services use kilograms for clinical records, but understanding how many stone you weigh remains helpful for personal tracking and comparing to UK population averages.
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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.
Healthy Weight Context at 80.4kg
At 80.4kg, your BMI depends on your height. For an average UK adult male (5ft 9in/175cm), this weight gives a BMI of approximately 26.2, falling into the overweight category. For an average UK adult female (5ft 3.5in/161.6cm), the same weight gives a BMI of around 30.9, entering the obese category.
The NHS recommends a healthy weight range of BMI 18.5–24.9 for most adults. At 80.4kg, reducing weight by approximately 5–10kg could move you into a healthier BMI range and improve cardiovascular health markers. Calculate your personal BMI using our free BMI calculator above to see your exact health category.
- 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 80.4kg in stone and pounds?
80.4kg equals 12 stone 8.4 pounds (12st 8.4lbs). The conversion uses the standard rate of 1 stone = 6.35029kg. To convert any weight, divide kilograms by 6.35029 to get stone, then multiply the decimal by 14 to get additional pounds.
Is 80.4kg considered a healthy weight?
Whether 80.4kg is healthy depends on your height and ethnicity. For most UK adults of average height, this weight falls into the overweight or obese BMI range. Use our BMI calculator to check your personal BMI category. Your GP can advise on healthy weight targets for your individual circumstances.
How much weight would I need to lose from 80.4kg to reach a healthy BMI?
This varies by height. For a 5ft 9in adult, healthy BMI requires approximately 63–78kg. For a 5ft 3in adult, approximately 51–64kg. The NHS recommends safe weight loss of 0.5–1kg per week. Consult your GP for personalised guidance on realistic and sustainable weight loss goals.
What's the difference between converting to stone versus pounds?
Stone and pounds are both imperial units. One stone equals exactly 14 pounds. So 80.4kg = 12 stone + 0.4 stone. Converting 0.4 stone to pounds gives 0.4 × 14 = 5.6 pounds. Our weight converter handles this automatically — just enter your kg and select the output unit.
How does 80.4kg compare to average UK adult weight?
The average UK adult male weighs approximately 85.7kg (13st 7lbs) and average female approximately 71.6kg (11st 3lbs). At 80.4kg, you're slightly below the male average but above the female average. Weight varies widely by age, height, and muscle mass — BMI is a more useful individual health indicator than population averages.
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.