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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Is 17.3 kg to Lbs a Healthy Weight?
17.3 kg is equivalent to 38.1 lbs — but whether this weight is healthy entirely depends on your height. A child weighing 17.3 kg might be perfectly normal, while an adult at this weight would be significantly underweight. This guide explains healthy weight ranges using NHS guidelines, shows you concrete examples across different heights, and helps you understand where your weight falls on the health spectrum. Use our free BMI calculator above to check your personal BMI instantly.
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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.
Healthy Weight Ranges by Height — UK NHS Standards
At 17.3 kg, your weight status depends entirely on your height. The NHS uses BMI (body mass index) to assess whether weight is healthy — calculated by dividing weight in kg by height in metres squared. For adults, the NHS healthy weight range is a BMI between 18.5 and 24.9.
Here are three concrete examples showing how 17.3 kg fits across different heights:
- At 4ft 6in (137cm): 17.3 kg gives a BMI of 9.2 — significantly underweight
- At 5ft 0in (152cm): 17.3 kg gives a BMI of 7.5 — severely underweight
- At 5ft 6in (168cm): 17.3 kg gives a BMI of 6.1 — dangerously underweight
In reality, 17.3 kg is a typical weight only for young children. For adults, this weight would require urgent medical attention. To convert kilograms to stone, use our free weight converter tool on this page for any weight you're assessing.
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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: What If You're Underweight or Outside Healthy Range?
If your weight is significantly below the healthy range for your height, it's important to speak with your GP. Being underweight can affect bone strength, immune function, energy levels, and overall health. The NHS recommends a personalised approach — your GP can assess whether your weight is healthy for you specifically, considering your medical history, frame size, and any underlying health conditions.
Measuring waist circumference alongside weight also matters: men should aim for below 94cm (37in), women below 80cm (31.5in). If you're concerned about your weight, track your health journey using our free progress tracker, and always consult your GP rather than attempting rapid weight changes alone.
- 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 17.3 kg in pounds?
17.3 kg equals 38.1 lbs. To convert kilograms to pounds, multiply by 2.20462. You can also convert to stone using our weight converter — 17.3 kg is approximately 2st 10lbs.
Is 17.3 kg healthy for an adult?
No. At 17.3 kg, an adult of any normal height would be severely underweight and require medical attention. This weight is typical only for young children. Consult your GP if you or someone else weighs this little.
What's the healthy weight for someone 5ft 6in tall?
For someone 5ft 6in (168cm) tall, the NHS healthy weight range is approximately 50–67 kg (7st 12lbs to 10st 7lbs). Calculate your personalised healthy weight range using our free BMI calculator on this page.
How do I know if my weight is healthy?
Use your height and weight to calculate your BMI — the NHS healthy range is 18.5 to 24.9. However, BMI doesn't account for muscle mass or where fat is stored. Your GP can provide personalised advice about what's healthy for you.
What should I do if I'm significantly underweight?
Speak with your GP. Being underweight can affect your health and requires a proper assessment. Your GP may refer you to a dietitian or other specialist to develop a safe, personalised plan to reach a healthier weight.
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.