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 19 Stone 5 in Kilograms?
19 stone 5 pounds (19st 5lbs) converts to approximately 123.38 kilograms. In the UK, we typically measure body weight in stone and pounds, but kilograms are the standard unit used by the NHS and in clinical healthcare settings. Understanding both measurements helps you engage effectively with health information, whether you're checking your BMI, discussing weight with your GP, or tracking progress towards a healthier weight. This conversion is straightforward using a simple formula, and our free weight converter above can calculate it instantly for any weight you need to convert.
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.
UK Health Context — What Does This Weight Mean?
At 123.38 kg, understanding your health context is important. Using NHS guidance, we can calculate your BMI and see how this weight relates to health recommendations for UK adults. For example, at a height of 1.73m (5ft 8in), a weight of 123.38 kg gives a BMI of approximately 41.2, which falls into the severely obese category (Class III) according to NHS classifications. However, BMI is just one screening tool — it doesn't account for muscle mass, fitness level, or where fat is stored around the body.
- Healthy weight BMI range: 18.5 to 24.9 (for most UK adults)
- For South Asian or Black African heritage: Lower thresholds apply — healthy range is 18.5 to 22.9
- Waist circumference also matters: Over 94cm (37 inches) for men or 80cm (31.5 inches) for women indicates increased health risk, regardless of BMI
Use our free BMI calculator on this page to find your personal BMI at this weight and your height — it gives you tailored NHS health guidance instantly.
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.
Weight Management and NHS Support in the UK
If you're at this weight and interested in weight management, the NHS offers structured support through its weight management pathway. Most people start with tier 1 support — self-help tools, digital resources, and community programmes. Your GP can refer you to tier 2 services for structured behaviour change support, or tier 3 specialist services if you need more intensive help, which may include prescription medications for weight management.
Even modest weight loss of 5–10% can bring significant health benefits, including improved blood pressure, better blood sugar control, and reduced joint strain. Our GLP-1 weight loss calculator can help you explore potential outcomes if you're considering prescription weight loss support, while our progress tracker lets you log and monitor your weight loss journey. Always speak to your GP about the right approach for your individual 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.
How do I convert 19 stone 5 pounds to kilograms?
Use the formula: (19 × 6.35029) + (5 × 0.453592) = 123.38 kg. Alternatively, use our free weight converter above — it calculates instantly for any stone and pounds combination. Our converter handles the maths so you don't have to.
What BMI is 19 stone 5 in kg?
BMI depends on your height. At 123.38 kg and 1.73m tall (5ft 8in), your BMI would be approximately 41.2, which falls into the severely obese category (Class III). Use our BMI calculator to find your personal BMI using your exact height and weight.
Is 19 stone 5 a healthy weight according to NHS guidelines?
According to NHS BMI categories, a healthy weight BMI is 18.5 to 24.9. At 123.38 kg, most adults would be above this range. However, your individual health picture depends on fitness level, muscle mass, and where weight is distributed. Your GP can give personalised health advice.
How much weight would I need to lose to reach a healthy BMI?
For someone 1.73m tall at a healthy BMI of 24.9, the target weight would be approximately 74.5 kg. That's a loss of about 48.88 kg from 123.38 kg. The NHS recommends losing no more than 0.5–1 kg per week for sustainable, healthy weight loss.
What support is available on the NHS for weight management at this weight?
Your GP can refer you to NHS tier 2 or tier 3 weight management services. Tier 3 services may include structured programmes, behaviour change support, and prescription medications if appropriate. Access varies by region, so ask your GP about services available in your area.
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.