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 4 in Kilograms?
12 stone 4 pounds (written as 12st 4lbs) equals 78 kilograms in metric measurements. If you're tracking your weight for health reasons or need to convert between UK and metric measurements, understanding your weight in both units is helpful. Our free weight converter above makes it easy to switch between stone, pounds, and kilograms instantly. Whether you're monitoring your health through NHS guidance or using a personal health tracker, having your weight in kg helps you access clinical resources and calculate your BMI accurately.
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.
What Does 12 Stone 4 Mean for Your Health?
At 12 stone 4 (78 kg), your health context depends on your height and individual circumstances. Using the BMI calculator on this page, you can determine where your weight falls according to NHS guidelines. For example, if you're 5ft 8in (173cm) tall, a weight of 78 kg gives a BMI of approximately 27.6, which falls in the overweight category (BMI 25–29.9). The NHS healthy weight range for this height is between 55–74 kg (8st 8lbs to 11st 9lbs). If your BMI is in the overweight or obese range, your GP can discuss personalised health approaches with you, which may include lifestyle changes, dietary adjustments, or in some cases, prescription weight management options.
- BMI at 78kg varies by height — use our free BMI calculator to find your personal score
- Healthy weight range depends on your specific height and individual health factors
- Your GP can offer tailored advice based on your health history and circumstances
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.
Managing Your Weight and Health
If you're considering weight management, the NHS recommends a sustainable approach combining dietary changes and increased physical activity. A calorie deficit of approximately 500 kcal per day typically supports a loss of around 0.5 kg per week. For adults who meet certain BMI and health criteria, prescription weight loss medications may be an option following assessment by a healthcare professional. Our free GLP-1 weight loss calculator can help you understand potential outcomes if weight management treatment is appropriate for you. Track your progress over time using our free progress tracker to monitor changes in your weight and health metrics.
- 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 12 stone 4 to kilograms?
12 stone 4 equals exactly 78 kg. To calculate: 12 stone × 6.35029 kg per stone = 76.20 kg, plus 4 pounds × 0.453592 kg per pound = 1.81 kg. Total: 78 kg. Use our free weight converter above to instantly convert between stone, pounds, and kilograms.
Is 12 stone 4 a healthy weight?
Whether 78 kg is healthy depends on your height. Use our free BMI calculator above to check your personal BMI using NHS guidelines. For example, at 5ft 8in, 78 kg gives a BMI of 27.6 (overweight). Your GP can assess your individual health and recommend personalised advice.
What's the healthy weight range if I'm 12 stone 4?
The healthy weight range depends on your height, not your current weight. At 5ft 8in (173cm), the NHS healthy range is 55–74 kg (8st 8lbs to 11st 9lbs). Use the BMI calculator on this page to find the healthy range for your specific height.
Can I use weight loss medication at 12 stone 4?
Prescription weight loss medications like Mounjaro or Wegovy require a clinical assessment by a licensed prescriber. Eligibility depends on your BMI, height, and any weight-related health conditions. Your GP can discuss whether you meet NHS criteria for specialist weight management services or refer you for private assessment.
How much weight would I need to lose to reach a healthy BMI?
This depends on your height. Our free BMI calculator shows the healthy weight range for your height instantly. If you want to estimate weight loss projections with medication, use our free GLP-1 weight loss calculator to see potential outcomes at different doses based on clinical trial data.
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.