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 38 Kg In Stones?
38 kilograms is equivalent to 5 stone 12.6 pounds (or approximately 5 stone 13 lbs). To convert kilograms to stone using the standard conversion, simply divide your weight by 6.35. However, whether 38 kg is a healthy weight for you depends entirely on your height. The same weight can give very different BMI results at different heights. Use our free weight converter above to switch between metric and imperial measurements instantly, then check your BMI to understand whether this weight falls within a healthy range for your individual circumstances.
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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.
38 Kg BMI At Different Heights
Your BMI depends on both your weight and height. At 38 kg, here's what your BMI would be at various typical heights:
- 150 cm (4ft 11in): BMI = 16.9 (healthy weight)
- 155 cm (5ft 1in): BMI = 15.8 (underweight)
- 160 cm (5ft 3in): BMI = 14.8 (underweight)
- 165 cm (5ft 5in): BMI = 14.0 (underweight)
- 170 cm (5ft 7in): BMI = 13.1 (underweight)
- 175 cm (5ft 9in): BMI = 12.4 (underweight)
Calculate your exact BMI using our free BMI calculator on this page by entering your actual height and weight. At 38 kg, most adults would fall into the underweight or lower healthy weight category, though this varies significantly by height and frame size.
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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.
Understanding NHS BMI Categories
The NHS classifies BMI ranges for adults as follows: 18.5 to 24.9 is healthy weight, 25.0 to 29.9 is overweight, and 30.0 and above is obese. Anything below 18.5 is classified as underweight. At 38 kg, most people would be underweight unless they are very short (under 150 cm). If you fall into the underweight category, it's worth discussing with your GP to ensure you're getting adequate nutrition. BMI has important limitations — it doesn't distinguish between muscle and fat, and it may be less accurate for very muscular individuals, older adults, or during pregnancy. Your GP can provide personalised advice about what your weight means for your individual health.
- 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.
Is 38 kg underweight?
At 38 kg, most adults would be classified as underweight according to NHS guidelines (BMI below 18.5), unless they are very short (under 150 cm). Your exact BMI depends on your height. Use our BMI calculator above to find your personal BMI by entering both your weight and height.
What does 38 kg convert to in stone and pounds?
38 kilograms equals approximately 5 stone 12.6 pounds (or roughly 5 stone 13 lbs). You can use our free weight converter on this page to convert between kg, stone, and pounds instantly for any weight.
What is a healthy weight at my height?
A healthy weight depends on your individual height. According to NHS guidelines, a healthy BMI ranges from 18.5 to 24.9. To find your healthy weight range, calculate your BMI using our free calculator above, or discuss with your GP who can give personalised advice based on your health history.
Why does BMI matter if I'm 38 kg?
BMI is a useful screening tool that helps identify whether weight may be associated with health risks. Being underweight can be linked to weakened bones, reduced immunity, and nutritional deficiencies. If you're concerned about your weight, speak to your GP for personalised guidance.
Can I use stone and pounds instead of kilograms?
Yes — the UK weight converter on this page converts between kilograms, stone, and pounds instantly. Many UK adults prefer stone and pounds for everyday use, so convert 38 kg to stone (5 stone 13 lbs) and use whichever measurement feels most natural for you.
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.