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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What is 78.5kg in Stones?
78.5 kilograms is equal to 12 stone 5.4 pounds (or 12st 5.4lbs). This is a straightforward metric to imperial weight conversion commonly used in the UK, where stone and pounds remain the preferred measurements despite NHS clinical records using kilograms. Whether you're tracking your weight, understanding health information, or converting measurements, our free weight converter above can instantly switch between kg, stone, and lbs for any value. At average UK heights, 78.5kg falls into different BMI categories depending on your height — use our free BMI calculator to check your personal health context.
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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.
78.5kg in Stone — Conversion Table & Formula
To convert kilograms to stone, divide your weight in kg by 6.35029. So: 78.5 ÷ 6.35029 = 12.36 stone, which equals 12 stone 5.4 pounds.
Here's a quick reference table showing 78.5kg alongside nearby values when you convert kilograms to stone:
- 75kg = 11st 11.0lbs
- 76kg = 11st 13.8lbs
- 77kg = 12st 1.6lbs
- 78.5kg = 12st 5.4lbs
- 79kg = 12st 7.4lbs
- 80kg = 12st 9.2lbs
- 81kg = 12st 11.0lbs
This conversion works because 1 stone = 6.35029kg exactly. The metric to imperial weight conversion is standard across UK health services, though most people naturally think in stone and pounds for everyday weight management.
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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.
78.5kg — BMI and Healthy Weight Context
At 78.5kg, your BMI depends entirely on your height. For example, at 5ft 8in (173cm), 78.5kg gives a BMI of approximately 27.6, which falls in the overweight category according to NHS guidelines. At 5ft 10in (178cm), the same weight results in a BMI of around 25.2 — within the healthy weight range. Use the BMI calculator on this page to find your personal BMI instantly.
For sustainable health, the NHS recommends aiming for a BMI between 18.5 and 24.9 (or 18.5–22.9 if you're of South Asian, Chinese, Black African, or Black Caribbean heritage). Even modest weight loss of 5–10% from your current weight can bring meaningful health benefits, including lower blood pressure and improved blood sugar control.
- 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 78.5kg to stone and pounds?
Divide 78.5 by 6.35029 to get 12.36 stone. To express this as stone and pounds, multiply the decimal (0.36) by 14 to get 5.04 pounds. So 78.5kg = 12 stone 5.4 pounds exactly.
Is 78.5kg a healthy weight for an adult?
It depends on your height and build. Use our free BMI calculator above to check your personal BMI. At average UK heights, 78.5kg may fall into the overweight, healthy, or overweight category. Your GP can provide personalised guidance based on your individual health profile.
What's the formula to convert kg to stone?
The formula is: weight in kg ÷ 6.35029 = weight in stone. For 78.5kg: 78.5 ÷ 6.35029 = 12.36 stone. You can use our free weight converter above to do this instantly for any weight.
What weight loss would make a difference at 78.5kg?
Losing just 5–10% of your body weight (approximately 4–8kg) can significantly improve health markers like blood pressure, cholesterol, and blood sugar control. The NHS recommends a safe, sustainable loss rate of 0.5–1kg per week through a balanced diet and increased physical activity.
How does 78.5kg compare to average UK adult weight?
The average UK adult woman weighs approximately 71.6kg, and the average UK adult man weighs approximately 85.7kg. At 78.5kg, you're slightly above the female average and slightly below the male average. However, "healthy weight" is individual — it depends on your height, age, muscle mass, and overall health.
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.