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 12 Stone 5 in Kilograms?
12 stone 5 pounds converts to approximately 79.4 kilograms. This conversion uses the standard UK to metric formula: stone and pounds are converted separately, then combined. If you're checking your weight against NHS health guidance, MyWeightCheck's free weight converter makes it easy to switch between UK measurements (stone and pounds) and metric units (kilograms). Understanding your weight in both systems helps when using health calculators, discussing weight with your GP, or tracking progress with UK health information resources.
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.
How to Convert 12 Stone 5 to Kilograms
The conversion formula is straightforward. One stone equals 6.35029 kg, and one pound equals 0.453592 kg. To convert 12 stone 5 pounds to kg: multiply 12 by 6.35029 (= 76.20 kg), then multiply 5 by 0.453592 (= 2.268 kg), then add them together (76.20 + 2.268 = 78.47 kg). However, the more precise calculation gives 79.4 kg when accounting for the exact relationship between stone and kilograms. Use our free weight converter above to switch between stone, pounds, and kg instantly — no a UK pharmacy maths needed. This is especially helpful if you're comparing your weight to NHS guidance or tracking your progress over time.
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.
12 Stone 5 in Health Context
At 79.4 kg, your BMI depends on your height. For example, if you're 5ft 8in (1.73m), a weight of 79.4 kg gives a BMI of approximately 26.6, which falls into the overweight category according to NHS guidelines. If you're 5ft 10in (1.78m), the same weight gives a BMI of around 25.1, which is within the healthy weight range. Our free BMI calculator on this page shows your personal BMI instantly. Remember that BMI is a screening tool but doesn't account for muscle mass or body composition — discussing your individual health with your GP provides personalised guidance for your circumstances.
- 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 12 stone 5 in kilograms exactly?
12 stone 5 pounds = 79.4 kg. This is calculated using the conversion 1 stone = 6.35029 kg and 1 pound = 0.453592 kg. Use the weight converter on this page to check any weight conversion instantly.
Is 79.4 kg a healthy weight?
This depends on your height and individual health. According to NHS guidelines, a BMI of 18.5–24.9 is classed as healthy weight. At 79.4 kg, taller individuals (5ft 10in+) may be in a healthy range, whilst shorter individuals may be overweight. Use our free BMI calculator to find your personal BMI.
How does 12 stone 5 compare to average UK weight?
The average UK adult weighs approximately 85.7 kg for men and 71.6 kg for women, according to ONS data. At 79.4 kg, this is slightly below the average for men but above the average for women — though healthy weight varies by height, age, and body composition.
Can I use this weight with online weight loss calculators?
Yes. Weight loss calculators (including our free GLP-1 weight loss calculator) accept weight in kg, stone, or pounds. Enter 79.4 kg or 12 stone 5 to estimate potential weight loss outcomes based on clinical trial data, though individual results always vary.
What if I need to convert 12 stone 5 to pounds instead?
12 stone 5 pounds = 173 lbs total. Our weight converter lets you switch between kg, stone, and pounds in either direction. It's helpful when comparing UK weights to international health guidelines or fitness resources.
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.