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
What Is 80.4kg in Stone and What BMI Does It Give?
80.4kg is equivalent to 12 stone 8.6 pounds in UK measurements. However, your BMI — the key health indicator — depends entirely on your height. At different heights, 80.4kg falls into different NHS weight categories, from healthy weight to obese. Use our free BMI calculator above to find your exact BMI instantly, or explore the example BMI values below for common UK heights to understand where you might fall on the NHS guidelines.
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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.
BMI Examples at 80.4kg Across Different Heights
Your BMI depends on your height, not just your weight. Here's how 80.4kg translates to BMI at common UK heights using the standard kg to stone conversion context:
- At 160cm (5ft 3in): BMI = 31.4 (Obese Class I)
- At 165cm (5ft 5in): BMI = 29.5 (Overweight)
- At 170cm (5ft 7in): BMI = 27.8 (Overweight)
- At 175cm (5ft 9in): BMI = 26.2 (Overweight)
- At 180cm (5ft 11in): BMI = 24.8 (Healthy weight)
- At 185cm (6ft 1in): BMI = 23.5 (Healthy weight)
These figures show that at 80.4kg, whether you're classified as overweight or healthy depends significantly on your height. The NHS BMI calculator on this page will give you your precise BMI in seconds.
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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.
Understanding NHS BMI Categories and Limitations
The NHS classifies BMI as: Healthy weight (18.5–24.9), Overweight (25–29.9), Obese Class I (30–34.9), Obese Class II (35–39.9), and Severely Obese (40+). However, BMI has important limitations — it doesn't distinguish between muscle and fat, so athletes may have a high BMI despite low body fat. It also doesn't account for where fat is stored; waist measurement matters too. For South Asian, Chinese, Black African, and Black Caribbean adults, the NHS recommends lower BMI thresholds due to higher health risks at the same BMI. Your GP can provide personalised guidance on what your BMI means for your individual health.
- 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 80.4kg to stone and pounds?
80.4kg converts to 12 stone 8.6 pounds. Use the formula: kg ÷ 6.35 = stone. Our free weight converter above makes this instant. You can also convert kilograms to stone using online tools or simply divide by 6.35029 for the exact stone weight in UK measurements.
Is 80.4kg a healthy weight?
It depends on your height. At 80.4kg, you could have a BMI ranging from 23.5 (healthy) to 31.4 (obese) depending on your height. Use our BMI calculator to find your exact BMI and NHS weight category. Your GP can advise whether this weight is healthy for you personally.
What's the healthy weight range for my height at 80.4kg?
The healthy weight range depends on your height. For example, at 175cm (5ft 9in), healthy weight is 56–76kg, so 80.4kg is above range. At 180cm (5ft 11in), healthy weight is 60–81kg, so 80.4kg is at the upper edge. Calculate your personal healthy weight range using our free BMI calculator above.
Why does BMI matter if I weigh 80.4kg?
BMI is used by the NHS to screen for weight-related health risks like type 2 diabetes, heart disease, and high blood pressure. A BMI over 25 increases these risks. However, BMI has limitations — it doesn't account for muscle mass or fat distribution. Your waist measurement and overall fitness also matter. Speak to your GP for a complete health assessment.
What should I do if my BMI at 80.4kg is in the overweight or obese range?
The NHS recommends losing weight at a rate of 0.5–1kg per week through a reduced-calorie diet and increased physical activity. Even a clinically studied weight loss can improve health. Your GP can refer you to weight management services or discuss prescription options if appropriate. Track your progress using our free progress tracker to stay motivated.
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.