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
19 Kg in Stone — Is This a Healthy Weight?
19 kg converts to 2 stone and 13.2 pounds using the standard kilogram to stone conversion. Whether this weight is healthy depends entirely on your height, age, and overall health. A weight that's healthy for a child or a very short adult may be underweight for someone taller. This guide explains how to determine if your weight falls within a healthy range using NHS guidance, and what to do if you'd like to assess your personal health status.
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.
Healthy Weight Ranges by Height
A healthy weight isn't a single number — it's a range that depends on your height. The NHS uses BMI (body mass index) to define healthy weight ranges. For most UK adults, a BMI between 18.5 and 24.9 is considered healthy weight.
At 19 kg, here are three examples showing whether this weight falls into a healthy range:
- Height 4ft 6in (137cm): BMI = 20.1 — healthy weight range
- Height 5ft (152cm): BMI = 16.3 — underweight (below healthy range)
- Height 5ft 6in (168cm): BMI = 12.3 — significantly underweight
Use our free BMI calculator above to check your personal BMI instantly based on your exact height and weight. This gives you a clear picture of where you sit within the NHS healthy weight ranges.
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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.
NHS Guidance and Next Steps
If your weight appears to be outside the healthy range, the NHS recommends speaking with your GP. Being significantly underweight (BMI below 18.5) can affect bone health, immunity, and energy levels, and deserves medical attention.
Beyond weight, the NHS also tracks waist circumference as an indicator of health risk. For men, over 94cm (37 inches) indicates increased risk; for women, over 80cm (31.5 inches). A conversation with your GP can help you understand what a healthy weight means specifically for you, taking into account your age, medical history, and individual circumstances. Weight is just one health marker — overall fitness, diet, and wellbeing matter too.
- 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 19 kg in stone and pounds?
19 kg converts to 2 stone and 13.2 pounds (often rounded to 2 stone 13 lbs). To convert kilograms to stone, divide the kg by 6.35. The weight converter on this page lets you switch between metric and imperial measurements instantly.
Is 19 kg a healthy weight for adults?
It depends on height. At 19 kg, adults under 5ft (152cm) tall may be within a healthy weight range, whilst taller adults at this weight would be significantly underweight. Use the BMI calculator above to check your personal BMI — it tells you if your weight is healthy for your specific height.
Who might weigh 19 kg?
19 kg is a typical weight for children aged 7–9 years old, or very small adults. For children, BMI categories are different from adults and are based on age and sex-specific growth charts — always consult your GP or health visitor about a child's weight rather than using adult BMI.
What should I do if I'm significantly underweight?
Being underweight (BMI below 18.5) can affect bone health, immunity, and energy levels. Speak with your GP to rule out underlying health conditions and get personalised advice. Your GP can discuss dietary support or referral to a specialist if needed.
How do I know my healthy weight range?
Your healthy weight range depends on your height. The NHS recommends a BMI of 18.5–24.9 for most adults. Our free BMI calculator on this page shows you your healthy weight range instantly — simply enter your height and current weight to see where you fall.
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.